A low-power, wide-range variable gain CMOS RF transmitter for 900 MHz wireless communications

摘要

This paper presents a low-power, wide-range variable gain RF transmitter for 900 MHz-band wireless communication applications based on a standard 0.18 μm CMOS technology. A very wide-range variable gain and high linearity up-conversion mixer is obtained by using a newly transconductance stage. High linearity at low power dissipation driver amplifier can be obtained by adopting a folded cascode topology with an additional gate-source capacitor. The measured results show conversion gain of 16 dB, dB-linear gain variation of 47 dB with the linearity error less than ±0.5 dB, output P-1 dB of 2 dBm, and OIP3 of 12 dBm while dissipating 4 mA from 1.25 V supply.