Patent Number: 8,089,309

Title: Transimpedance amplifier input stage mixer

Abstract: A Gilbert cell mixer design is disclosed. Instead of using a differential transconductance stage as typically done, the design employs a differential transimpedance amplifier input stage. By utilizing a transimpedance input stage to the Gilbert mixer, feedback is used to obtain higher linearity without sacrificing noise performance. The transimpedance input stage supplies a current signal to the cascode connected Gilbert switching quad, so the transimpedance amplifier output is taken from the collector of the transimpedance amplifier output transistor, instead of the emitter as normally done with transimpedance amplifiers.

Inventors: Jansen; Douglas S. (Pelham, NH), Flewelling; Gregory M. (Bedford, NH)

Assignee: BAE Systems Information and Electronic Systems Integration Inc.

International Classification: G06G 7/12 (20060101)

Expiration Date: 2020-01-03 0:00:00