Patent ID: 7830198
Filing Date: 2010-11-09
Classification: H03D

Abstract:
1. A multi-input mixer comprising: a first differential pair circuit including a pair of transistors with source terminals coupled to each other, gate terminals of the pair of transistors receiving a differential input signal; a plurality of first transistors that are coupled in parallel, a drain terminal of each of the plurality of first transistors being coupled to the source terminals of the pair of transistors of the first differential pair circuit, gate terminals of the plurality of first transistors receiving a respective radio frequency input signal, each of the plurality of first transistors determining to mix the respective radio frequency input signal with the differential input signal to generate a first differential output signal at an output of the first differential pair circuit according to an enable signal; and a selecting circuit coupled to the gate terminals of the plurality of first transistors, for receiving a control signal and generating the enable signal.