CMOS mixer design for cable modem RF tuner

Abstract

An up-conversion mixer for RE tuner of cable modem has been designed in a standard 0.35 mu CMOS process. As an up converter, the mixer translates 40MHz to 900MHz input band to the Intermediate frequency of 1.2GHz. Overall conversion gain of 13dB, noise figure of 11.4dB, IIP3 of -11 dBm, 1 dB gain compression point of -17dBm for LO power of 4dBm is obtained and the circuit takes around 7mA from a 3.3 V supply. Simulations were done using cadence spectre RF. The design shows that mixer have comparable linearity with expected noise performance