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RF Paper:a 2.7V GSM RF transceiver IC
Abstract—A 2.7-V RF transceiver IC is intended for small, lowcost
global system for mobile communications (GSM) handsets.
This chip includes a quadrature modulator (QMOD) and an
offset phase locked loop (OPLL) in the transmit path and a dual
IF receiver that consists of a low noise amplifier (LNA) with
an active-bias circuit, two Gilbert-cell mixers, a programmable
gain linear amplifier (PGA), and a quadrature demodulator
(QDEM). The IC also contains frequency dividers with a very
high frequency voltage controlled oscillator (VHF-VCO) to simplify
the receiver design. The system evaluation results are the
phase error of 2.7 rms and the noise transmitted in the GSM
receiving band of 􀀀163 dBc/Hz for transmitters and the reference
sensitivity of 􀀀105 dBm for receivers. Power-control functions are
provided for independent transmit and receive operation. The IC
is implemented by using bipolar technology with fT = 15 GHz,
rbb = 150 , and 0.6-m features. |
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发表于 2007-6-16 04:39:16
