An 81 MHz IF receiver in CMOS

In most digital radio systems, RF and IF functions are performed in GaAs and bipolar technologies, while baseband processing functions are performed in CMOS. As device geometries are reduced, CMOS becomes a viable alternative to bipolar technology to perform the RF and IF functions. In this paper a CMOS IF receiver that performs amplification, mixing and bandpass A/D conversion is presented. The receiver is described. It consists of a continuous-time IF amplifier, a subsampling switched-capacitor gain stage and a sixth order bandpass /spl Sigma//spl Delta/ A/D converter.