TRF1020

TRF1020 GSM RECEIVER D Operates from 2.75 V to 3.5 V Supply D Low Current Consumption D Low Profile Package: 48-pin Plastic Quad Flat Package (PQFP) D Global System for Mobile Communications (GSM), Class 3, 4, or 5 Mobile Station (MS) Portable Cellular Telephone Applications D Conversion from Radio Frequency (RF) to I and Q Baseband on a Single Chip SLWS028B – MAY 1998 – REVISED SEPTEMBER 1998 D Independent Powerdown of Low Noise Amplifiers (LNA), Mixers, Intermediate Frequency (IF) Amplifiers, and Voltage-Controlled Oscillator (VCO) D Digital Gain Control for LNA and IF Amplifiers D Two IF Amplifiers for Dual Conversion if Required D Cascaded Operation of IF Amplifiers for Single-Conversion Configurations D DC Compensation of I and Q Outputs description The TRF1020 is a single-chip radio frequency (RF) downconverter suitable for 900-MHz GSM applications. It combines in one small package an LNA, an RF mixer, an IF mixer, two IF amplifiers, an I and Q mixer, and one buffered VCO. The TRF1020 requires few external components. The LNA has a nominal gain of 12.4 dB and noise figure of 2.1 dB. The first RF mixer has a conversion gain of 13.4 dB and a single-sideband (SSB) noise figure of 8.3 dB. The IF amplifiers have combined variable gain from 0 to 84 dB in approximately 3-dB steps. The IF amplifier frequency range is 40 to 180 MHz for the first IF amplifier and 10 to 180 MHz for the second IF amplifier. The local oscillator of the I and Q mixer operates at four times the las...