Patent ID: 9634773
Date: 2017-04-25
CPC Classifications: H03D,H04B

Claim:
1. A method for suppressing harmonic signals, comprising: providing a mixer comprising: a first mixing module; a second mixing module; and an adding module, wherein the first mixing module comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor and a first constant current source, a gate of the first transistor is coupled to a positive input end of an input signal, a gate of the second transistor is coupled to a negative input end of the input signal, sources of the first transistor and the second transistor are coupled to an anode of the first constant current source, a cathode of the first constant current source is grounded, a drain of the first transistor is coupled to sources of the third transistor and the fourth transistor, a drain of the second transistor is coupled to sources of the fifth transistor and the sixth transistor, gates of the third transistor and the sixth transistor are coupled to a negative input end of a first local oscillation signal, gates of the fourth transistor and the fifth transistor are coupled to a positive input end of the first local oscillation signal, drains of the third transistor and the fifth transistor are coupled to a positive input end of a first output signal, and drains of the fourth transistor and the sixth transistor are coupled to a negative input end of the first output signal; mixing the first local oscillation signal with the input signal by the first mixing module to obtain the first output signal, and mixing a second local oscillation signal with the input signal by the second mixing module to obtain a second output signal, the first output signal comprising an n-order harmonic signal, n being a positive integer greater than 1; and adding the first output signal and the second output signal by the adding module to suppress the n-order harmonic signal in the first output signal; wherein, the first local oscillation signal and the second local oscillation signal have different mark-space ratios but a same local oscillation frequency.