Patent ID: 7725092
Filing Date: 2010-05-25
Classification: H03D

Abstract:
1. A mixer, comprising: a Gilbert cell mixer core having first and second nodes, receiving a first differential input signal, and providing a differential output signal at the first nodes thereof; a pair of load devices respectively coupled between the first nodes of the Gilbert cell mixer core and a first fixed voltage; a dynamic current steering cell having third nodes coupled to the second nodes and fourth nodes; and a transconductor cell coupled between the fourth nodes and a second fixed voltage and receiving a second differential input signal; wherein the dynamic current steering cell alternately steers current of the transcondcutor cell to or away from the Gilbert cell mixer core; wherein the dynamic current steering cell comprises first transistors coupled between the third and fourth nodes thereof and second transistor coupled between the fourth nodes and a third fixed voltage, wherein gates of the first and second transistors respectively receive one and the other of a reference voltage and a steering voltage.