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从板上的那颗RF2722芯片来看,是支持EDGE的。! T& E b1 b! h" {; y
The RF2722 is a highly-integrated receiver IC supporting GSM, GPRS, and EDGE cellular standards in the
6 H$ i" h- l* L/ ~! p4 EGSM850, EGSM, DCS, and PCS bands. The RF2722 supports both very-low intermediate frequency (VLIF) as
0 D' w5 Y* a3 D8 |$ _& ewell as direct conversion receive (DCR) architectures, reducing external component count and eliminating the+ U p) x: P- a5 ~+ z
need for IF SAW and RF interstage filters without compromising performance. The IC includes: four LNA’s for: Q' ]3 g0 n/ d u
multi-band support; an integrated voltage controlled oscillator (VCO); automatic gain control (AGC); a quadrature
7 h6 p C/ g/ M0 L: X/ hdownconverting mixer; and, low and high band transmit buffers. Chip functionality, including IF AGC setting, is
8 r! @3 ^0 A3 u# `: _& Bcontrolled through a three-wire serial data interface (SDI). The RF2722 is part of the POLARISTM TOTAL RADIOTM; v ` {- }6 P7 s% D9 K4 b
solution.
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[ 本帖最后由 kgbkgb 于 2009-2-3 14:17 编辑 ] |
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