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从板上的那颗RF2722芯片来看,是支持EDGE的。
- g$ P2 c% d/ V7 NThe RF2722 is a highly-integrated receiver IC supporting GSM, GPRS, and EDGE cellular standards in the
. S8 @9 a! }# z0 ?# lGSM850, EGSM, DCS, and PCS bands. The RF2722 supports both very-low intermediate frequency (VLIF) as
1 `/ ?( S" e7 z* K7 Q+ I) jwell as direct conversion receive (DCR) architectures, reducing external component count and eliminating the
2 _. g3 R3 f$ v; L3 \need for IF SAW and RF interstage filters without compromising performance. The IC includes: four LNA’s for6 U1 \, r* S- `2 w
multi-band support; an integrated voltage controlled oscillator (VCO); automatic gain control (AGC); a quadrature1 q( v# g5 l( {; A% z! r! {
downconverting mixer; and, low and high band transmit buffers. Chip functionality, including IF AGC setting, is5 k) M: X5 @: D$ C
controlled through a three-wire serial data interface (SDI). The RF2722 is part of the POLARISTM TOTAL RADIOTM) p7 M, i/ q1 f! S7 [& ?3 z
solution.
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[ 本帖最后由 kgbkgb 于 2009-2-3 14:17 编辑 ] |
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