Patent ID: 7589579
Filing Date: 2009-09-15
Classification: H03D

Abstract:
1. A mixer circuit comprising: a first input stage that receives a first input voltage signal at a first frequency and generates a first output current varying in dependence upon said first input voltage signal, the first input stage comprising a first transistor and a second transistor connected to said first transistor, wherein the first input voltage signal is applied to bases of the first transistor and the second transistor; a second input stage that receives the first input voltage signal at the first frequency and generates a second output current varying in dependence upon the first input voltage signal, the second input stage comprising a third transistor and a fourth transistor connected to said third transistor, wherein the first input voltage signal is applied to bases of the third transistor and the fourth transistor; and a first current modulating stage connected to the first input stage to modulate the first output current, wherein the first current modulating stage comprises: a second current modulating stage connected to the second input stage to modulate the second output current, wherein the second current modulating stage comprises: