HD155121F

HD155121F RF Transceiver IC for GSM and PCN Dual band cellular systems ADE-207-265A (Z) 2nd Edition May 1999 Description The HD155121F is a RF transceiver IC for GSM and PCN dual band cellular systems, and integrates most of the low power silicon functions of a transceiver. The HD155121F incorporates two bias circuits for RF LNAs, two first mixers, a second mixer, a programmable gain amplifier, and an IQ demodulator for the receiver, and an IQ modulator and offset PLL for the transmitter. Also, on chip are dividers for the phase splitter. Moreover the HD155121F includes control circuits to implement power saving modes. These functions can operate down to 2.7 V and are housed in a 48-pin LQFP SMD package. Hence the HD155121F can form a small size transceiver handset for dual band by adding a dual PLL frequency synthesizer IC, power amplifiers and some external components. The HD155121F is fabricated using a 0.6 µm double-polysilicon Bi-CMOS process. Functions Receiver(Rx) Low Noise Amplifier (LNA) bias circuit First mixer IF amplifier and second mixer Programmable Gain Amplifier (PGA) IQ demodulator with 90 degree phase splitter Transmitter(Tx) IQ modulator with 90 degree phase splitter Offset PLL  Down converter  Phase comparator  TXVCO driver Others IF dividers Power saving control circuit IFVCO HD155121F Features Highly integrated RF processing for hand-portables Operating supply voltage  VCC : 2.7 to 3.6 V  Phase comparator and TXVCO driver...