skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@ skyworksinc.com ? www.skyworksinc.com 200028a ? skyworks proprietary and confidential information ? products and product informatio n are subject to change witho ut notice ? july 28, 2004 1 product summary SKY74091: receiver for cdma, amps, pcs, and gps mobile handset applications applications ? tri-band, quad-mode handsets ? pcs and gps phones ? cdma and gps phones features ? two-step gain control, pcs lna ? three-step gain control, cellular lna ? gps lna ? external resistor to adjust lna bias current ? independent amps, cdma, pcs, and gps mixers ? single lo input for cdma, pcs, and gps mixer ? buffered lo signal for transmit upconverter ? single external uhf vco for pll circuitry ? 90 db dynamic range vga ? integrated vhf oscillator and tank circuit ? vco_on control for current optimization ? battery cell operation (2.7 v < vcc < 3.3 v) ? rflga? package (48-pin, 7 x 7 mm) with down-set paddle description the SKY74091 is a highly integrated, super-heterodyne receiver. this single intermediate frequency (if), multi-mode, tri-band receiver is intended for use in code division multiple access (cdma) phones in personal communications system (pcs), cellular cdma, advanced mobile phone system (amps), and global positioning system (gps) modes. except for the surface acoustic wave (saw) filters and matching components, the device incorporates all the components required to implement the receiver chain, from the low-noise amplifier (lna) to the in-phase and quadrature (i/q) demodulator stages. three lnas are in the front-end receiver: a three-step gain stage cellular lna (high, mid, and bypass), a two-step gain stage pcs lna (high, bypass), and a high gain stage gps lna. after rf lna signal amplification and filtering from the antenna, the received signal is mixed down from rf to the if. there are separate mixers for amps, cdma-cellular, cdma-pcs, and gps modes. to use a single if frequency plan, the cdma and pcs mixer outputs have been combined. therefore, both cdma and pcs bands use the same if saw filter. the amps differential output can be combined externally to mate to a single-ended saw filter. the gps mixer is an image-reject mixer, which eliminates the need for an external rf saw filter between the lna and mixer. the gps image-reject mixer has a differential output for an external l-c bandpass filter. after if filtering, the if signal is amplified by a variable gain amplifier (vga) and fed to an i/q demodulator, resulting in baseband i/q signals at the output. the SKY74091 is also designed with a single local oscillator (lo) input port for the amps/cdma/pcs/gps mixer. these mixers operate at different rf frequency inputs, but have the same if frequency output. this usually refers to a single if plan at 183.6 mhz. the lo_in signal (pin 39) provides an lo port for the cdma/pcs/gps mixers. in the cellular band, an internal divider divides the frequency by two, which provides the lo input to the cellular mixer. in the gps band, the uhf lo frequency is 2/3 that of the uhf vco frequency. this allows only a single external vco. the uhf vco is also buffered and amplified internally, which provides the lo to drive the transmtiter upconverter lo port. the vga has a minimum dynamic range of 90 db with a control voltage range of 0.5 to 2.5 v, which is common to all modes. a vhf oscillator operates with external tank circuits to provide lo frequencies for the i/q demodulator in the cellular, pcs, and gps modes. the noise figure, gain, and third order input intercept point (iip3) of each stage in the receiver are optimized to meet the system requirements for amps and cdma modes according to tia/eia-98-c. the design employs sige bicmos technology for low cost, high performance, and a high level of integration. a block diagram of the SKY74091 is shown in figure 1.
product summary ? SKY74091 skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@ skyworksinc.com ? www.skyworksinc.com 2 july 28, 2004 ? skyworks proprietary and confidential information ? products a nd product information are subject to chang e without notice ? 200028a pcs_lna_out cell_lna_out gps_lna_out pcs_mix_in cell_mix_in lo_in x2 afc 3 gps_lna_in vco_tune pll i+ i? q+ q? xtal amps_vga_in pcs_lna_in cell_lna_in s222 90 o 90 o 90 o + 2 2 4 cdma_vga_in+ gps_vga_in cellular mixer amps, 800 mhz cellular mixer cdma, 800 mhz pcs mixer cdma, 1800 mhz cellular lna cdma/amps, 800 mhz pcs lna cdma, 1800 mhz 2 cdma_vga_in ? amps_if+ lo_out gps_if+ cell_pcs_if+ cell_pcs_if? gps_if? amps_if? 2 2 figure 1. SKY74091 receiver block diagram ordering information model name manufacturing part number product revision SKY74091 cdma, amps, pcs, and gps receiver SKY74091-11 copyright ? 2003, 2004, skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyw orks solutions, inc. (skywork s) products. these materials are provided by skyworks as a serv ice to its customers and may be used for informational purposes only by the customer. skyworks assumes no responsibilit y for errors or omissions in these mater ials. skyworks may make changes to its documentation, products, specifications and product descriptions at any time, without notice. skyworks makes no commitment to update the information and shall have no responsibilit y whatsoever for conflicts, incompatibilities, or other difficulties aris ing from future changes to its documentat ion, products, specif ications and product descriptions. no license, express or implied, by estoppel or otherwise, to an y intellectual property rights is granted by or under this docum ent. except as may be provided in skyworks terms and conditions of sale for such products, skyworks assumes no liability whatsoever in association with its documentation, products, specification s and product descriptions. these materials are provided as is without warranty of any ki nd, either express or implied or otherwise, relating to sale and /or use of skyworks products including warranties relating to fitness fo r a particular purpose, merchantability, pe rformance, quality or non-infringement of any patent, copyright or other intellectual property right. skyworks further does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. skyworks shall not be liable for any damages, in cluding special, indirect, inci dental, or consequential damage s, including without limitation, lost revenues or lost profits that may result from the use of these materials whether or not the recipien t of materials has been adv ised of the possibility of such damage. skyworks products are no t intended for use in medical, lifesaving or life-su staining applications. skyw orks customers using or selling skyworks products for use in such applications do so at their own risk and agree to fully indemnify skyworks for an y damages resulting from such improper use or sale. the following are trademarks of skyworks solutions, inc.: skyworks?, the skyw orks logo, and breakthro ugh simplicity?. product n ames or services listed in this publication are for identification purposes only, and may be trademarks of skyw orks or other third parties. third-party br ands and names are the property of their respective owners. addition al information, posted at www.skyworksinc.com, is incorporated by reference.
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