Digitally programmable CMOS transconductor for very high frequency

Abstract

This paper describes a new approach for realizing digitally programmable VHF/UHF transconductors compatible with pure digital CMOS technologies. A programmable/tunable transconductor, based on a parallel connection of unit cascode cells, is used to implement a fully balanced current-mode G m– C integrator to operate over the 30–200 MHz range with more than 70 dB of dynamic range for 1% of THD.