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may 1996 OQ2538HP sdh/sonet main amplifier application note demonstration board
may 1996 2 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP features full functional testing capability 4-layer epoxy fr4 pcb differential microstrip lines with 50 w odd mode impedance sma rf connectors single-ended and differential operation possible assembly instructions full extended ground and supply voltage layers applications functional verification performance evaluation application tests general description the demonstration board for the OQ2538HP limiting amplifier ic can be supplied assembled or non assembled. this board can be used to evaluate the OQ2538HP, alone, and allows the designer to do extensive testing without having to worry about other external factors. for maximum reliability the ic is fixed to the board. this application note describes the schematic and the layout of the board and contains assembly instructions. a functional test is described in detail. a data sheet for the ic is available: data sheet OQ2538HP, preliminary specification, may 1996 ordering information to order demonstration boards, write to: philips semiconductors c&m-n marketing department gerstweg 2 6534 ae nijmegen the netherlands
may 1996 3 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP demo board schematic veef veef veef veef sline.aa l2 1 2 3 4 ic1 OQ2538HP vee 1 gnd 10 n.c. 11 vee 12 vee 13 n.c. 14 n.c. 15 gnd 16 gnd 17 losdc 18 n.c. 2 gnd 20 ref 21 capa 22 23 n.c. vee 24 vee 25 n.c. 26 n.c. 27 gnd 29 agc 3 outq 30 31 gnd out 32 gnd 33 34 gnd n.c. 35 vee 36 37 vee los 19 gnd 39 gnd 4 n.c. 40 gnd 41 gnd 42 agcdc 43 coffq 44 coff 45 n.c. 46 n.c. 47 28 gnd vee 48 gnd 5 inq 6 gnd 7 in 8 gnd 9 n.c. 38 l1 sline.aa 8.2nf c4 8.2nf 12 34 c9 8.2nf c11 100pf c6 c7 100pf 8.2nf c3 c1 100nf c10 1nf p10 p9 p8 p6 p1 100 r1 p2 p4 blm32 l3 4.7uf c8 25v c5 p7 100nf c12 c2 100nf 100nf r2 100 1 2 3 100 r3 r4 100 c13 100nf pin 6 pin 8 r=200 ohm optional (instead of r1,r4, c6 and c7) vee 100nf 100nf 100nf 100nf c3,c4,c11 are optional mount r2 and r3 only if 50 w matching is required
may 1996 4 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP bill of materials item no count company part no component series vendor toler ance rating geometry reference 1 1 8222-411-q2538 board 2 1 mks3733-1-0-303 mks3730_3p mks3730 stocko mks3730_3p p7 3 5 2422-034-15068 solder pin small philips solder pin small p1,p2,p8, p9,p10 4 4 2322-704-61001 100 rc21 philips 1% 0.063 w r0603_hf r1,r2,r3, r4 5 9 2222-910-16649 100 nf c910-x7r philips 10% 25 v c0805_hf c1,c2,c3, c4,c5,c9, c11,c12, c13 6 2 2222-867-12101 100 pf c867-np0 philips 5% 63 v c0603_hf c6,c7 7 1 2222-861-12102 1 nf c861-np0 philips 5% 63 v c0805_hf c10 8 1 2222-122-56478 4.7 uf sal-rp 122 philips 20% 25 v case_r3 c8 9 1 pn-OQ2538HP OQ2538HP ic_universal philips sot313 ic1 10 1 blm32a07 blm32 cbd murata blm32 l3 11 4 142-0801-811 sma launcher coax ef johnson sma p3,p4,p5, p6
may 1996 5 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP demo board assembly drawing
may 1996 6 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP layout: top layer, signal layer layout: 2nd layer, ground layer (negative projection)
may 1996 7 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP layout: 3rd layer, supply layer (negative projection) layout: bottom layer, gnd & signal layer
may 1996 8 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP pinning symbol pin description type (1) v ee 1 negative power supply s n.c. 2 not connected - agc 3 recti?er a output o gnd 4 ground s gnd 5 ground s inq 6 main ampli?er inverting input i gnd 7 ground s in 8 main ampli?er input i gnd 9 ground s gnd 10 ground s n.c. 11 not connected - v ee 12 negative power supply s v ee 13 negative power supply s n.c. 14 not connected - n.c. 15 not connected - gnd 16 ground s gnd 17 ground s losdc 18 recti?er b reference output o los 19 recti?er b output o gnd 20 ground s ref 21 band gap reference o capa 22 band gap reference decoupling a n.c. 23 not connected - v ee 24 negative power supply s v ee 25 negative power supply s n.c. 26 not connected - n.c. 27 not connected - gnd 28 ground s gnd 29 ground s outq 30 main ampli?er inverted output o gnd 31 ground s out 32 main ampli?er output o gnd 33 ground s gnd 34 ground s
may 1996 9 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP note 1. pin type abbreviations: o = output, i = input, s = power supply, a = analog function. n.c. 35 not connected - v ee 36 negative power supply s v ee 37 negative power supply s n.c. 38 not connected - gnd 39 ground s n.c. 40 not connected - gnd 41 ground s gnd 42 ground s agcdc 43 recti?er a reference output o coffq 44 automatic offset control capacitance return a coff 45 automatic offset control capacitance a n.c. 46 not connected - n.c. 47 not connected - v ee 48 negative power supply s symbol pin description type (1)
may 1996 10 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP fig.1 pin configuration. handbook, full pagewidth 1 2 3 4 5 6 7 8 9 10 11 36 35 34 33 32 31 30 29 28 27 26 13 14 15 16 17 18 19 20 21 22 23 48 47 46 45 44 43 42 41 40 39 38 12 24 37 25 OQ2538HP mge744 v ee n.c. gnd gnd gnd outq gnd gnd n.c. n.c. v ee v ee n.c. agc gnd gnd inq in gnd n.c. v ee out n.c. n.c. coff coffq agcdc gnd n.c. gnd n.c. v ee v ee gnd gnd gnd n.c. n.c. gnd gnd losdc los gnd capa n.c. v ee v ee ref
may 1996 11 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP preparing the demo board for operation !! warning: the rf input and output ic pins are not esd protected . handle the demonstration board according to standard esd handling procedures! the ic can be operated in single-ended or differential mode. for single-ended operation the board must be assembled according to the schematic. if the ic is used in a differential application, it is recommended leave the components r1, r4, c6, c7 unmounted and, in stead, mount a 200 w resistor with case style 0603 across the differential input lines. adjust the supply voltage (v ee ) to -4.5v before connecting the power cable to the board. !! warning: the inputs in/inq must be ac coupled to any instrument. use sma dc blocks at the inputs before connecting the rf source to the demo board! if the ic is tested single-ended, the unused rf input/output must be terminated with 50 w . all rf connections from the instruments to the demo board should be made with high quality low-loss coaxial rf cable, with 50 w characteristic impedance. the 100 w resistors r2 & r3 at the outputs out/outq are placed to have a 50 w matching of the testboard to a 50 w cable. these resistors are not essential in an application, where the succeeding ic (e.g. data&clock recovery) is positioned close to the oq2538 output. functional test: dc operating point and offset compensation to verify all dc characteristics both the inputs and outputs have to remain open. the voltage levels at the pins can be measured with a digital voltmeter. the input dc offset must be lower than 0.6 mv. this should be measured with a voltmeter directly across the input pins.
may 1996 12 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP functional test: frequency response and noise figure . linear (small signal) gain: to verify gain and bandwidth, measure the forward transmission s21 with a 2-port vector network analyser as shown in figure 1. the input power level of the analyser should be set to -50 dbm. make sure, that the network analyser is calibrated for this power level. the s21 should be around 40db with a bandwidth of about 3 ghz. note that the input matching network reduces the overall gain of this configuration by 3db if compared to the gain of the ic only. noise figure: a spectrum analyzer must be connected to the 2nd output (outq) to measure the output noise spectrum. if n0 represents the noise level measured by spectrum analyzer in 1hz bandwidth and expressed in dbm, the noise figure can be evaluated acc. to the equation below. nf=n0-(s21+3)+173.8 db due to the input matching network, the gain that is measured with the network analyzer is 3 db lower than the real amplifier gain. this must be accounted in the noise figure calculation by adding 3 db to the measured s21. note further that log(kt) is 173.8 dbm network analyzer port 1 port 2 s-parameter test set dc block vee z o =50 w z o =50 w OQ2538HP 50 w dc block termination in inq out outq demo board in spectrum analyzer fig 1. functional test set up: frequency response and noise figure
may 1996 13 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP measured s21 vs. frequency ch1 s 21 log mag 3 db/ ref 40 db start 10.000 000 mhz stop 6 000.000 000 mhz c2 smo 1 2 3 4 1_: 37.454 db 3 230.647 510 mhz 2_: 40.474 db 3 ghz 3_: 40.371 db 2 ghz 4_: 40.373 db 1 ghz
may 1996 14 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP functional test: time domain to test the input sensitivity, output levels, rise/fall times and overshoot, a prbs pattern generator in combination with an rf clock generator is needed, as depicted in the figure above. with this setup the ic can be tested in differential mode. the input sensitivity can be determined by starting off with a high input level (100 mv) and then reducing the input signal level until the amplitude of the output waveform starts to diminish. this is an indication that the amplifier is no longer clipping the signal. the input level for this case is equal to the input sensitivity. in addition to the above measurement also the maximum allowed input signal level range has to be tested. the shape of the wave form should not change under this severe input overload condition. the rise/fall times (based on 10%-90% crossings) can easily be determined with an oscilloscope. the overshoot and the band averaged jitter is not specified in the data sheet, but can be measured accordingly. 1 2 tr sampling osc/tdr/tdt c c d d c in tr pattern generator c mod clock source 50 db attenuators fig 2. functional test set up: time response OQ2538HP in inq out outq demo board
may 1996 15 philips semiconductors application note sdh/sonet main ampli?er OQ2538HP measuired differential eye pattern.

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