|
从板上的那颗RF2722芯片来看,是支持EDGE的。
) i5 T4 u9 c$ iThe RF2722 is a highly-integrated receiver IC supporting GSM, GPRS, and EDGE cellular standards in the
6 v. J8 R* u& l9 x l9 fGSM850, EGSM, DCS, and PCS bands. The RF2722 supports both very-low intermediate frequency (VLIF) as
# D u& L: k4 N" i% t" K$ t0 {% Dwell as direct conversion receive (DCR) architectures, reducing external component count and eliminating the0 i" A' g- Q+ I9 r9 Q8 r: s
need for IF SAW and RF interstage filters without compromising performance. The IC includes: four LNA’s for
0 m9 P1 r( l& {multi-band support; an integrated voltage controlled oscillator (VCO); automatic gain control (AGC); a quadrature( U/ i+ N5 H I x# K. [
downconverting mixer; and, low and high band transmit buffers. Chip functionality, including IF AGC setting, is) w* ~ n, `6 d
controlled through a three-wire serial data interface (SDI). The RF2722 is part of the POLARISTM TOTAL RADIOTM
3 N, S% e; [# S# N. B6 Fsolution.
) p9 U# d2 _! p" `4 i
0 L$ p. h. M( V6 W$ y9 F[ 本帖最后由 kgbkgb 于 2009-2-3 14:17 编辑 ] |
|