A CMOS Single-Differential LNA and current bleeding CMOS mixer for GPS Receivers

This work presents a low noise amplifier (LNA) and mixer for 1558-1578 MHz Global Position System (GPS). The LNA uses cascode structure to eliminate the Miller effect. Also the next stage, the double-balanced Gilbert cell mixer is accomplished for good performance such as isolation. We suggest a Single-Differential LNA mode which has enough gain and two differential outputs. The LNA and Mixer are integrated together on a chip in 0.18 μm CMOS technology. The conversion gain of LNA and Mixer is 26 dB when one IF port is terminated to 50Ω. The 1dB compression point is -26 dBm. NF for LNA and Mixer is 4.3 dB. The total chip area is 530μm*500μm. The two circuit consumes current about 10 mA. The main achievement of this design is that we get low noise, high gain, and good linearity under low power.