Patent ID: 9543997
Date: 2017-01-10
CPC Classifications: G01S,H03D,H04B

Claim:
1. A circuit comprising: a mixer comprising a signal input port, a local oscillator input port and an output port, wherein the output port of the mixer comprises a current mode output; a first current steering circuit and a second current steering circuit, wherein the first and second current steering circuit each comprises a first positive current source, a first negative current source, and an output, and for each of the current steering circuits: a lowpass filter circuit having an input coupled to the output of the second current steering circuit and a terminal configured to be connected to a shunt capacitor; and a difference circuit having a first input coupled to the output of the first current steering circuit and a second input coupled to the output of the second current steering circuit and an output of the lowpass filter circuit, wherein an output of the difference circuit substantially rejects a DC signal component at the output port of the mixer.