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fn6986 rev 0.00 page 1 of 19 october 20, 2009 fn6986 rev 0.00 october 20, 2009 qhx220 active isolation enhancer and interference canceller datasheet electromagnetic interference (emi) is emerging as a major concern in next generation wireless communication systems. as wireless terminals now support multiple services and features that utilize high data rates simultaneously, removing interference within wireless terminals like handsets has become a challenge. reducing the electromagnetic interference recovers the receiver sensitivity, enabling simultaneous operation of multiple radios, and improves the overall quality of service of communication devices. intersil?s qhx220 is situated in a handset to sample the source of the noise an d emulate the rf coupling channel between the noise source and victim receiver antenna. in doing so, an anti-noise signal can be applied directly to the victim receive path to cancel the emi and achieve the signal integrity benefits. this approach makes it possible to cancel both in-band (within the victim rx band) or out-of-band aggressors. this is a revolutionary approach since it is only possible to cancel out of band noise using conventional rx filters. in addition qhx220 may be used to increase the inherent isolation between antennas or inside duplexers and switch es, thus allowing to increase the transmit power in repeat ers or yielding higher sensitivity in the receivers. both measures finally resulting in a better coverage, larger cell size, smaller antennas or lower power of infrastructure components such as basestations, pico-and femtocells as well as repeaters. the qhx220 integrates the sampler path lna gain stages as well as the dacs required to control the i and q control voltages (used to set the magnitude and phase of the cancellation signal). both the gain, and control voltages are programmable using a spi bus interface. features ? protocol agnostic. designed for: gsm, cdma, dvb-h, isdb-t, dmb ? frequency range 300mhz to 3ghz ? integrated, programmable lna gain stages in the sampler path ? spi bus controlled integrated dacs ? >20db noise cancellation is possible ? 50db typical dynamic range ? low power consumption (<20mw typical, ~2w standby) ?ultra small ~ 1mm 2 devices are available as tested bumped die or 3x3mm 2 qfn package applications ? most any wireless device with a local aggressor: - cell phones -mobile tv devices -laptop computers -gps terminals - pico- and femtocells ? improved tx to rx isolation of devices (i.e. duplexer, switches) or between neighboring antennae ? basestations ? linearization of pas typical application circuit benefits ? actively cancels unwanted local rf noise ? improves ber, receiver sensitivity, c/n by canceling noise generated from local aggressors ? improves isolation between adjacent antennas ? can be used to cancel in-band or out-of-band interferers (i.e. spurs, harmonics, phase noise, or other noise sources like im products generated in a pa) ? enables simultaneous operation of multiple co-located radios ? improves overall quality of service figure 1. active isolat ion enhancer and noise canceller n o t r e c o m m e n d e d f o r n e w d e s i g n s n o r e c o m m e n d e d r e p l a c e m e n t c o n t a c t o u r t e c h n i c a l s u p p o r t c e n t e r a t 1 - 8 8 8 - i n t e r s i l o r w w w . i n t e r s i l . c o m / t s c
qhx220 fn6986 rev 0.00 page 2 of 19 october 20, 2009 ordering information part number (note 1) part marking temp. range (c) package (pb-free) pkg. dwg. # QHX220IQT7 qh220 -40 to +85 16 ld qfn 7? prod. tape & reel; qty 1,000 l16.3x3b qhx220iqsr qh220 -40 to +85 16 ld qfn 7? sample reel; qty 100 l16.3x3b coming soon qhx220ict7 (note 2) 220 -40 to +85 9 ball csp 7? prod. tape & reel; qty 1,000 tbd coming soon qhx220icsr (note 2) 220 -40 to +85 9 ball csp 7? sample reel; qty 100 tbd notes: 1. these intersil pb-free plastic packaged products employ sp ecial pb-free material sets, molding compounds/die attach materials, and 100% matte tin pl ate plus anneal (e3 termination finish, which is rohs compliant and compatible with both snpb and pb-free soldering operations). intersil pb-free products are msl classified at pb-free pe ak reflow temperatures that meet or exceed the pb-free requ irements of ipc/jedec j std-020. 2. contact intersil marketing for availability. pin configurations qhx220 (16 ld qfn) top view qhx220 (9 ball csp) top view 1 3 4 15 gnd1 sampler in gnd1 enbar gnd2 ind nc vdda2 16 14 13 2 12 10 9 11 6 578 gnd2 rf out gnd2 bus enable vdda clk data extr 123 b c a gnd rf in enbar inductor data clk vdd rf out busen pin descriptions qfn pin # qfn pin name csp pin # csp pin name description 1, 3, 10, 12, 16 gndx 1a gnd ground 2 sampler in 2a rf in rf input 4 enbar 3a enbar enable (active low) ? tied to gnd 5, 13 vddx 1c vdd 1.8v power supply 6 clk 3b clk input clock (spi) 7 data 2b data data line (spi) 8 extr - - external resistor for gain tempco control 9 bus enable 3c busen bus enable (active low, spi) 11 rf out 2c rf out rf output 14 nc - - no connect 15 ind 1b inductor external inductor for lna - exposed center pad - - ground
qhx220 fn6986 rev 0.00 page 3 of 19 october 20, 2009 overcoming noise or interference using the qhx220 identifying common sources of electromagnetic interference (emi) ? a flex cable carrying high-speed data from a base-band processor to an lcd/camera display. ? closely spaced antennas of radios operating simultaneously. ? harmonics, other mixing products or spurs that fall within the victim receive band. ? poor isolation from local transmitter (via antennas, duplexers or other front end modules). ? noise on common ground or v cc supply lines. acquiring and sampling the source of unwanted interference intersil?s qhx220 reduces emi by sampling the interference source at its input. the sampled noise signal is acquired in close proximity to the noise source either with an emi detector, an additional coupling element on the pcb or direct tap of the noise source using a rc network. emulating the coupling channel to achieve an inverse signal once the qhx220 acquires and samples the unwanted interferer, the general-purpose canceller feeds the sampled noise signal through an analog signal processor, which allows contro l of the phase within 360 and the amplitude within a dynamic range of 50db. this enables the qhx220 to output an inverse signal of the interference plus coupling channel in order to eliminate the desensitization of the victim receiver.
qhx220 fn6986 rev 0.00 page 4 of 19 october 20, 2009 absolute maximum ratings thermal information supply voltage (v dd to gnd) . . . . . . . . . . . . . . . . . . .2.1v i/o voltage at all input pins . . . . gnd - 0.3v to v dd + 0.3v esd rating (hbm) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kv thermal resistance (typical) ? ja (c/w) ? jc (c/w) 16 ld qfn package (notes 3, 4) . . 60 13 operating ambient temperature range . . . . -40c to +85c storage ambient temperature range . . . . -55c to +150c maximum junction temperature . . . . . . . . . . . . . . . +125c pb-free reflow profile . . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/pb-freereflow.asp caution: do not operate at or near the maximum ratings listed for extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. notes: 3. ? ja is measured with the component mounted on a high effective thermal conductivity test board in free air. see tech brief tb379 for details. 4. for ? jc , the ?case temp? location is the center of the exposed metal pad on the package underside. operating conditions parameter symbol condition min typ max units notes supply voltage v dd 1.7 1.8 1.9 v operating ambient temperature t a -40 25 85 c power consumption (operation mode) @high/low gain mode 16 28.7 mw 5 @boost gain mode 23 33 mw 5 power consumption (standby mode) 10 38.3 w 5 note: 5. max power specifications tested under ecc test conditions. control pin characteristics typical values are at v dd = 1.8v, t a = +25c, and p in = < -48dbm, unless otherwise noted. extreme characterization conditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. parameter symbol condition min typ max units notes logic input level - low enbar low 0.2 v dd mv logic input level - high enbar high 0.8 v dd v enable response time delay following high to low transition until rf output is within 10% of its final value. 535 ns 6 disable response time delay following low to high transition until rf output is within 10% of its final value. 350 ns control word length 24 bits bits 0-9 i-dac value 10 bits bits 10-19 q-dac value 10 bits bits 20-21 application select 00: uhf-band 01: l-band 11: ism band bit 22 gain switch 1 bit bit 23 (note 18) extended feature 1 bit 7 notes: 6. the enable response time is bounded by the input ac cap on board. typical response ti me reflects 100pf capacitance. 7. generally set to low. two successive spi instructions are needed to enable or disable boost gain mode. sequence to enable boost gain mode ? 1st instruction: set bit<23:20> to 1x01?b ?? 2nd instruction: set bit<23:20> to 0xxx?b sequence to disabl e boost gain mode ? 1st instruction: set bit<23:20> to 1x10?b ? 2nd instruction: set bit<23:20> to 0xxx?b
qhx220 fn6986 rev 0.00 page 5 of 19 october 20, 2009 spi bus characteristics figure 2. spi bus timing diagram busenbar clk data 24bit data register lock msb lsb t ds t dh t cp t beb2c t c2beb t ch t cl spi bus timing requirement symbol parameter min typ max t cp spi clock period 100ns t cl clock pulse width low 40ns t ch clock pulse widt h high 40ns t beb2c busenbar fall to clk rise setup time 5ns t c2beb clk rise busenbar fall delay 40ns t ds data setup time 20ns t dh data hold time 0ns table 1. spi bus data format 10bit i-dac <23:14> 10bit q-dac <13:4> freq range <3:2> gain <1> spare <0>
qhx220 fn6986 rev 0.00 page 6 of 19 october 20, 2009 power on/off sequence power on power off notes: 8. when the chip is powered up its register are all zero. this means -135 phase and full analog gain, wlan application and 0db coarse gain (the boost gain mode is not enabled). 9. vdda and vdda2 should be connected on the pcb and decoupled with caps right next to the pin. 10. the spi bus is not accessible when vdda/vdda2 are <1v. clk data bus enable enbar vdda & vdda2 slope1: >1.8v/50ms 10 23456789 1 11 12 13 14 15 16 17 18 19 20 21 22 23 24 i-dac (10 bits: 0111111111) q-dac (10 bits: 0111111111) freq. range (mtv: 00) gain (0) spare (0) msb 23 22 21 20 19 18 17 16 151413121110987654321 lsb 0 low low 0v 1.8v power on t1>0 low low t2>250s clk data bus enable enbar vdda & vdda2 low low 1.8v 0v slope2: >1.8v/50ms power off low low
qhx220 fn6986 rev 0.00 page 7 of 19 october 20, 2009 electrical specifications typical test conditions (ttc) v dd = 1.8v, t a = +25c, and pin < -48 dbm, unless otherwise noted. extreme characterizat ion conditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. output load test condition is 50 ? in parallel with 50 ? unless otherwise stated. electrical specifications reflect pe rformance of qfn packaged devices. parameter condition mi n typ max units notes frequency coverage 0.3 3 ghz 11 max. gain (high gain mode) uhf-band 450mhz/770mhz 8.4/-3 14.9/8.0 18/11.8 db 12 l-band 1575mhz 7.3 12.0 16.3 db 12 ism band 2400mhz 2.0 db 12 max. gain (low gain mode) uhf-band 450mhz/770mhz -7.2/-15.4 2.8/-4.1 7.3/1.4 db 12 l-band 1575mhz -5.4 0.9 4.9 db 12 ism band 2400mhz -9.1 db 12 max. gain (boost gain mode) uhf-band 450mhz/770mhz 17.1/9.2 20.1/12.2 23.1/15.2 db 12 l-band 1575mhz 14.7 17.7 20.7 db 12 ism band 2400mhz 7.64 db 12 max dynamic range 27.4 50 db phase control range 0 360 absolute gain accuracy over ecc uhf-band 450mhz/770mhz -2.5 1.5 db 13, 18 l-band 1575mhz -2.5 1.5 db 13, 18 ism band 2400mhz db 13, 18 iip3 of sampler input (high gain mode) uhf-band 450mhz/770mhz -34.7/-24.7 dbm 18 l-band 1575mhz -34.8 -31.3 dbm 18 ism band 2400mhz -20.75 dbm 18 iip3 of sampler input (low gain mode) uhf-band 450mhz/770mhz -33.4/-25.1 dbm 18 l-band 1575mhz -35.1 -31.5 dbm 18 ism band 2400mhz -23 dbm 18 iip3 of sampler input (boost high gain mode) uhf-band 450mhz/770mhz -46.3/-34.5 -42.8/-31.0 dbm 18 l-band 1575mhz -40.48 -36.98 dbm 18 ism band 2400mhz -24 dbm 18 output noise power (high gain mode) uhf-band 450mhz/770mhz -158.8/-164.1 dbm/hz 14, 18 l-band 1575mhz -161.7 dbm/hz 14, 18 ism band 2400mhz -168.7 dbm/hz 14, 18 output noise power (low gain mode) uhf-band 450mhz/770mhz -168.6/-171.6 dbm/hz 14, 18 l-band 1575mhz -169.8 dbm/hz 14, 18 ism band 2400mhz -173.1 dbm/hz 14, 18 output noise power (boost high gain mode) uhf-band 450mhz/770mhz -153.9/-160.5 dbm/hz 14, 18 l-band 1575mhz -156.1 dbm/hz 14, 18 ism band 2400mhz -164.7 dbm/hz 14, 18 lna noise figure (high gain mode) uhf-band 450mhz/770mhz 1.5 dbm 15, 18 l-band 1575mhz 1.5 dbm 15, 18 ism band 2400mhz 2.0 dbm 15, 18
qhx220 fn6986 rev 0.00 page 8 of 19 october 20, 2009 input reflection coefficient (high gain) uhf-band 450mhz/770mhz -1.0/-2.6 dbm 15, 18 l-band 1575mhz -0.06 dbm 15, 18 ism band 2400mhz -2.3 dbm 15, 18 input reflection coefficient (low gain) uhf-band 450mhz/770mhz -1.3/-2.5 db 16, 18 l-band 1575mhz -0.3 db 16, 18 ism band 2400mhz -2.1 db 16, 18 input reflection coefficient (boost high gain) uhf-band 450mhz/770mhz -1.0/-2.7 db 16, 18 l-band 1575mhz 2.4 db 16, 18 ism band 2400mhz -1.0 db 16, 18 rf output impedance (rp//cp) uhf-band 450mhz/770mhz rp = 6.9/4.6, cp = 620/616 k ? , ff 17, 18 l-band 1575mhz rp = 2.2, cp = 619 k ? , ff 17, 18 ism band 2400mhz rp = 1.0, cp = 680 k ? , ff 17, 18 output insertion loss uhf-band 450mhz/770mhz 0.1 db 18 l-band 1575mhz 0.3 db 18 ism band 2400mhz 0.7 db 18 notes: 11. part will operate under the specified frequency ranges. electrical performance is not optimal beyond the uhf-band (low end) and ism band (high end). 12. data provided for external tank circuit with q ? 2 and f center ? 550mhz. 13. extreme corner conditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. 14. input connected to a 50 ? load during measurement. 15. nf improves beyond high gain when going into boost gain. values not tested on ate. 16. s11 based upon single series inductor matching. 17. rp//cp given at typical gain point of canceller. 18. limits established by characteri zation and not production tested. electrical specifications typical test conditions (ttc) v dd = 1.8v, t a = +25c, and pin < -48 dbm, unless otherwise noted. extreme characterizat ion conditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. output load test condition is 50 ? in parallel with 50 ? unless otherwise stated. electrical specifications reflect pe rformance of qfn packaged devices. (continued) parameter condition mi n typ max units notes
qhx220 fn6986 rev 0.00 page 9 of 19 october 20, 2009 typical performance char acteristics (uhf-band) plots are exemplary only, to show typical performance and pr ovide a frame of reference. ty pical test conditions (ttc) v dd =1.8v, t a = +25c, and pin < -48dbm, unless otherwise noted. extreme characterization conditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. figure 3. 3d attenuation plot for gain and phase family of curves figure 4. 2d contour plot for gain and phase family of curves in high boost mode (red circle = unity gain) figure 5. gain vs frequency at low, mid, high, and boost gain set points figure 6. gain variation under ecc measured at 770mhz at max gain set-point vctrla vctrlb attenuation @750mhz temperature (c) gain (db) gain vs temperature at 770mhz vctrl_a = vctrl_b = 0v -8 -6 -4 -2 0 2 4 6 8 10 -40 -5 25 55 85 hg v dd = 1.9v hg v dd = 1.8v hg v dd = 1.7v lg v dd = 1.7v lg v dd = 1.8v lg v dd = 1.9v
qhx220 fn6986 rev 0.00 page 10 of 19 october 20, 2009 figure 7. phase variation under ecc measured at 770mhz at max gain set-point figure 8. iip3 variation under ecc measured at 770mhz at max gain set-point figure 9. phase coverage for gain and phase family of curves figure 10. noise floor for gain and phase family of curves vs frequency typical performance char acteristics (uhf-band) (continued) plots are exemplary only, to show typical performance and pr ovide a frame of reference. ty pical test conditions (ttc) v dd =1.8v, t a = +25c, and pin < -48dbm, unless otherwise noted. extreme characterization conditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. temperature (c) phase () phase vs temperature at 770mhz vctrl_a = vctrl_b = 0v 204 206 208 210 212 214 216 218 220 222 -40 -5 25 55 85 hg v dd = 1.9v hg v dd = 1.8v hg v dd = 1.7v lg v dd = 1.7v lg v dd = 1.8v lg v dd = 1.9v temperature (c) iip3 (dbm) iip3 vs temperature at 770mhz vctrl_a = vctrl_b = 0v -32 -30 -28 -26 -24 -22 -20 -18 -40 -5 25 55 85 hg v dd = 1.9v hg v dd = 1.8v hg v dd = 1.7v lg v dd = 1.7v lg v dd = 1.8v lg v dd = 1.9v
qhx220 fn6986 rev 0.00 page 11 of 19 october 20, 2009 figure 11. 3d noise floor plot for gain and phase family of curves @ 750mhz figure 12. supply current variation under ecc typical performance char acteristics (uhf-band) (continued) plots are exemplary only, to show typical performance and pr ovide a frame of reference. ty pical test conditions (ttc) v dd =1.8v, t a = +25c, and pin < -48dbm, unless otherwise noted. extreme characterization conditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. 0.00 0.40 0.70 0.65 1.00 1.40 0.0 0.7 1.2 -177 -175 -173 -171 -169 -167 -165 -163 -161 -159 -157 -155 average noise power (dbm/hz) control a (v) control b (v) mtv noise plot -157--155 -159--157 -161--159 -163--161 -165--163 -167--165 -169--167 -171--169 -173--171 -175--173 -177--175 temperature (c) i dd (ma) supply current vs temperature at 770mhz 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 1.0 10.5 11.0 -40 -5 25 55 85 hg v dd = 1.9v hg v dd = 1.8v hg v dd = 1.7v lg v dd = 1.7v lg v dd = 1.8v lg v dd = 1.9v typical performance ch aracteristics (l-band) plots are exemplary only, to show typical performance and pr ovide a frame of reference. ty pical test conditions (ttc) v dd =1.8v, t a =+25c, and p in < -48dbm, unless otherwise noted. extr eme characterization co nditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. figure 13. 3d contour pl ot for gain and phase family of curves in high gain mode figure 14. 2d contour plot for gain and phase family of curves in high boost mode (red circle = unity gain) vctrla vctrlb attenuation @750mhz
qhx220 fn6986 rev 0.00 page 12 of 19 october 20, 2009 figure 15. gain vs frequency at low, mid, high, and boost gain set points figure 16. gain variation under ecc measured at 1575mhz at low gain and high gain set-points figure 17. phase variation under ecc measured at 1575mhz at low gain and high gain set-points figure 18. iip3 variation under ecc measured at 1575mhz at low gain and high gain set-points typical performance ch aracteristics (l-band) (continued) plots are exemplary only, to show typical performance and pr ovide a frame of reference. ty pical test conditions (ttc) v dd =1.8v, t a =+25c, and p in < -48dbm, unless otherwise noted. extr eme characterization co nditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. temperature (c) gain (db) gain vs temperature at 1575mhz vctrl_a = vctrl_b = 0v -2 0 2 4 6 8 10 12 14 -40-5 255585 hg v dd = 1.9v hg v dd = 1.8v hg v dd = 1.7v lg v dd = 1.7v lg v dd = 1.8v lg v dd = 1.9v temperature (c) phase () phase vs temperature at 1575mhz vctrl_a = vctrl_b = 0v 205 210 215 220 225 230 -40 -5 25 55 85 hg v dd = 1.9v hg v dd = 1.8v hg v dd = 1.7v lg v dd = 1.7v lg v dd = 1.8v lg v dd = 1.9v temperature (c) iip3 (dbm) iip3 vs temperature at 1575mhz vctrl_a = vctrl_b = 0v -40 -38 -36 -34 -32 -30 -28 -26 -40 -5 25 55 85 hg v dd = 1.9v hg v dd = 1.8v hg v dd = 1.7v lg v dd = 1.7v lg v dd = 1.8v lg v dd = 1.9v
qhx220 fn6986 rev 0.00 page 13 of 19 october 20, 2009 figure 19. phase coverage for gain and phase family of curves vs frequency figure 20. noise floor for gain and phase family of curves vs frequency figure 21. 3d noise floor plot for gain and phase family of curves @ 1575mhz figure 22. supply current variation under ecc typical performance ch aracteristics (l-band) (continued) plots are exemplary only, to show typical performance and pr ovide a frame of reference. ty pical test conditions (ttc) v dd =1.8v, t a =+25c, and p in < -48dbm, unless otherwise noted. extr eme characterization co nditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. 0.00 0.40 0.70 0.65 1.00 1.40 0.0 0.7 1.2 -177 -175 -173 -171 -169 -167 -165 -163 -161 -159 -157 -155 average noise power (dbm/hz) control a (v) control b (v) gps noise plot -157--155 -159--157 -161--159 -163--161 -165--163 -167--165 -169--167 -171--169 -173--171 -175--173 -177--175 temperature (c) i dd (ma) supply current vs temperature at 1575mhz 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 -40-5 255585 hg v dd = 1.9v hg v dd = 1.8v hg v dd = 1.7v lg v dd = 1.7v lg v dd = 1.8v lg v dd = 1.9v
qhx220 fn6986 rev 0.00 page 14 of 19 october 20, 2009 typical performance char acteristics (ism band) plots are exemplary only, to show typical performance and pr ovide a frame of reference. ty pical test conditions (ttc) v dd =1.8v, t a = +25c, and pin < -48dbm, unless otherwise noted. extreme characterization conditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. figure 23. 3d attenuation plot for gain and phase family of curves vs frequency figure 24. 2d contour plot for gain and phase family of curves in boost mode (red circle = unity gain) figure 25. gain vs frequency at low, mid, high, and boost gain set points vctrla vctrlb attenuation @750mhz
qhx220 fn6986 rev 0.00 page 15 of 19 october 20, 2009 figure 26. phase coverage for gain and phase family of curves figure 27. noise floor for gain and phase family of curves vs frequency figure 28. 3d noise floor plot for gain and phase family of curves @ 2.4ghz typical performance char acteristics (ism band) (continued) plots are exemplary only, to show typical performance and pr ovide a frame of reference. ty pical test conditions (ttc) v dd =1.8v, t a = +25c, and pin < -48dbm, unless otherwise noted. extreme characterization conditions (ecc) are v dd = 1.7v to 1.9v, t a = -40c to +85c. 0.00 0.40 0.70 0.65 1.00 1.40 0.0 0.7 1.2 -179 -177 -175 -173 -171 -169 -167 -165 -163 -161 -159 -157 -155 average noise power (dbm/hz) control a (v) control b (v) wlan noise plot -157--155 -159--157 -161--159 -163--161 -165--163 -167--165 -169--167 -171--169 -173--171 -175--173 -177--175 -179--177
qhx220 fn6986 rev 0.00 page 16 of 19 october 20, 2009 operation the architecture of the qhx220 is similar to that of a linear vector modulator. a spi bus interface is used to control the internal 10-bit da cs, which in turn control the vgas in the rf-path. the vga settings sett the i and q of a vector modulator and provide full control over the magnitude and phase of the output cancellation signal. the spi interface is also used to control internal lna gain stages at the sampler input, which can provide additional gain when sampling weaker noise sources. the qhx220 allows for a full 360 phase control and up to 50 db of dynamic range of the input rf signal. this tuning range is used to emulate the rf noise coupling channel that is present between the noise source and victim receiver. the noise coupling channel can be radiated from the noise source to the victim receive antenna or via some other leakage path to the receiver - most often it is a combination of the two. figure 30 illustrates the gain and phase control provided by the vector modu lator. the coverage map is represented in polar form. in practice it is not possible to reach origin at the minimum gain setting, which represents a gain of zero. this is due to the isolation limitations that exist in any device. thus it is not possible to completely eliminate that signal in the forward path, resulting in minimum gain levels in the order of -45dbm or -55dbm. figure 29. block diagram figure 30. polar plot
qhx220 fn6986 rev 0.00 page 17 of 19 october 20, 2009 evaluation board general purpose evaluations boards are available for the qhx220 devices. they allow for basic functional testing of the ic. however, more importantly they are designed to be easily integrated into customer applications as an rf daughter card for initial proof of concept. the qhx220 has internal pre-amplification gain stages that can be used to amplify the sampled noise signal if additional ga in is required to emulate the noise coupling channel. there are also internal dacs to control the amplitude and phase (i and q) of the device. a software control gui is provided to enable control of the device. sampler figure 31. evaluation board gnd noise spi interface qhx220 rx output rx input 1.8v input (from antenna) (to receiver) input led
fn6986 rev 0.00 page 18 of 19 october 20, 2009 qhx220 intersil products are manufactured, assembled and tested utilizing iso9001 quality systems as noted in the quality certifications found at www.intersil.com/en/suppor t/qualandreliability.html intersil products are sold by description on ly. intersil may modify the circuit design an d/or specifications of products at any time without notice, provided that such modification does not, in intersil's sole judgment, affect the form, fit or function of the product. accordingly, the reader is cautioned to verify that datasheets are current before placing orders. information fu rnished by intersil is believed to be accu rate and reliable. however, no responsib ility is assumed by intersil or its subsidiaries for its use; nor for any infrin gements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com for additional products, see www.intersil.com/en/products.html ? copyright intersil americas llc 2009. all rights reserved. all trademarks and registered trademarks are the property of their respective owners. software gui a software interface is provided to facilitate the control of the evaluation board. the gui can be used to control of the internal gain stages and dacs via a spi bus interface. these two control signals are also referenced to as ?i? (in phase?) and ?q? (quadrature phase) control in the user interface. the qhx220 controller software is an application that uses the usb port of a pc to emulate the spi bus communications to device. the initial user in terface will look like the following: the left tab within the window allows the user to directly set or sweep the i and q values that control the qhx220. the right tab allows the user to control the phase & amplitude (which is simply a mathematical conversion of the i and q values). similarly to the i and q panel, the phase & amplitude panel can be used to set or sweep the amplitude and phase of the qhx220 and is often a more intuitive approach to performing the optimization. in both cases a small window appears in the bottom right corner to illustrate the alternate i & q or phase and amplitude representation. about q:active q:active technology is behind intersil?s ability to insert its ics inside radios, automotive infotainment systems, satellite broadcast equipment, and various consumer electronic devices such as gps units, cell phones, and portable gaming systems. by doing so, intersil achieves the ability to reduce electromagnetic interference by as much as 30db. this breakthrough in radio sensitivity allows for several signals to run simultaneously and enables new technologies such as mobile tv on hand held games, cell phones, and in automotive systems. figure 32. software gui
qhx220 fn6986 rev 0.00 page 19 of 19 october 20, 2009 package outline drawing l16.3x3b 16 lead quad flat no-lead plastic package rev 1, 4/07 located within the zone indicate d. the pin #1 identifier may be unless otherwise specified, t olerance : decimal 0.05 tiebar shown (if present) i s a non-functional feature. the configuration of the pin #1 identifier is optional, but mus t be between 0.15mm and 0.30mm from the terminal tip. dimension b applies to the metallized terminal and is measured dimensions in ( ) for reference only. dimensioning and tolerancing c onform to amse y14.5m-1994. 6. either a mold or mark feature. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: bottom view detail "x" typical recomme nded land pattern top view bottom view side view 9 ( 2. 80 typ ) ( 1. 70 ) (4x) 0.15 ( 12x 0 . 5 ) ( 16x 0 . 60) ( 16x 0 . 23 ) 0 . 90 0.1 index area pin 1 6 a 3.00 b 3.00 12 4 4 5 8 16x 0.40 0.10 5 0 . 2 ref c 0 . 00 min. 0 . 05 max. b c ma 0.10 c - 0.05 base plane 0.10 c see detail "x" c 0.08 seating plane + 0.07 16x 0.23 16 13 12x 1.5 4x 0.50 1 6 pin #1 index area 1.70 + 0.10 - 0.15

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