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从板上的那颗RF2722芯片来看,是支持EDGE的。) t: o( V$ A) E
The RF2722 is a highly-integrated receiver IC supporting GSM, GPRS, and EDGE cellular standards in the E# v$ A8 h$ v
GSM850, EGSM, DCS, and PCS bands. The RF2722 supports both very-low intermediate frequency (VLIF) as$ f! d8 I- \: N- m
well as direct conversion receive (DCR) architectures, reducing external component count and eliminating the
$ y( Y3 t4 Z& Q/ qneed for IF SAW and RF interstage filters without compromising performance. The IC includes: four LNA’s for6 D$ }+ d7 t5 K s- c
multi-band support; an integrated voltage controlled oscillator (VCO); automatic gain control (AGC); a quadrature) B8 j1 P7 U) x& k+ j' B* S# Q
downconverting mixer; and, low and high band transmit buffers. Chip functionality, including IF AGC setting, is/ a& Z: c, V" y2 v- w' ?
controlled through a three-wire serial data interface (SDI). The RF2722 is part of the POLARISTM TOTAL RADIOTM
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[ 本帖最后由 kgbkgb 于 2009-2-3 14:17 编辑 ] |
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