Mixing circuit with high harmonic suppression ratio

Patent metadata

Field	Value
Publication number	US-2021281218-A1
Application number	US-202017037692-A
Country	US
Kind code	A1
Filing date	Sep 30, 2020
Priority date	Mar 3, 2020
Publication date	Sep 9, 2021
Grant date	—

Abstract

The present disclosure provides a mixing circuit with high harmonic suppression ratio, including: a multi-phase generation module, which receives a first input signal and generates eight first square wave signals with a phase difference of 45°; a quadrature phase generation module, which receives a second input signal and generates four second square wave signals with a phase difference of 90°; a harmonic suppression module, connected with an output end of the quadrature phase generation module to filter out higher order harmonic components in the second square wave signals; and a mixing module, connected with output ends of the multi-phase generation module and the harmonic suppression module to mix output signals of the multi-phase generation module and the harmonic suppression module. The mixing circuit with high harmonic suppression ratio adds a harmonic suppression module on the basis of multi-phase mixing, thereby improving the harmonic suppression ratio of the output signal.

First claim

We claim:

1 . A mixing circuit with high harmonic suppression ratio, at least comprising:
a multi-phase generation module, which receives a first input signal and generates eight first square wave signals with a phase difference of 45°; a quadrature phase generation module, which receives a second input signal and generates four second square wave signals with a phase difference of 90°; a harmonic suppression module, connected with an output end of the quadrature phase generation module to filter out higher order harmonic components in the second square wave signals; and a mixing module, connected with output ends of the multi-phase generation module and the harmonic suppression module to mix output signals of the multi-phase generation module and the harmonic suppression module.

2 . The mixing circuit with high harmonic suppression ratio according to claim 1 , wherein the first square wave signals are same frequency signals or frequency division signals of the first input signal.

3 . The mixing circuit with high harmonic suppression ratio according to claim 1 , wherein the multi-phase generation module comprises: a first limiting amplifier unit, which receives the first input signal and amplifies the first input signal into a rail-to-rail signal; and a first frequency division unit, connected with an output end of the first limiting amplifier unit, and dividing a frequency of an output signal of the first limiting amplifier unit.

4 . The mixing circuit with high harmonic suppression ratio according to claim 1 , wherein the first input signal is a pair of differential signals.

5 . The mixing circuit with high harmonic suppression ratio according to claim 2 , wherein the first input signal is a pair of differential signals.

6 . The mixing circuit with high harmonic suppression ratio according to claim 3 , wherein the first input signal is a pair of differential signals.

7 . The mixing circuit with high harmonic suppression ratio according to claim 1 , wherein the second square wave signals are same frequency signals or frequency division signals of the second input signal.

8 . The mixing circuit with high harmonic suppression ratio according to claim 1 , wherein the quadrature phase generation module comprises: a second limiting amplifier unit, which receives the second input signal and amplifies the second input signal into a rail-to-rail signal; and a second frequency division unit, connected with an output end of the second limiting amplifier unit, and dividing a frequency of an output signal of the second limiting amplifier unit.

9 . The mixing circuit with high harmonic suppression ratio according to claim 1 , wherein the second input signal is a pair of differential signals.

10 . The mixing circuit with high harmonic suppression ratio according to claim 7 , wherein the second input signal is a pair of differential signals.

11 . The mixing circuit with high harmonic suppression ratio according to claim 8 , wherein the second input signal is a pair of differential signals.

12 . The mixing circuit with high harmonic suppression ratio according to claim 1 , wherein the harmonic suppression module comprises a low-pass filter unit.

13 . The mixing circuit with high harmonic suppression ratio according to claim 1 , wherein the mixing module comprises a Gilbert mixing unit.

14 . The mixing circuit with high harmonic suppression ratio according to claim 13 , wherein the Gilbert mixing unit comprises three subunits with a tail current ratio of 1:√{square root over (2)}:1.

Assignees

• Verisilicon Microelectronics Shanghai Co Ltd
• Verisilicon Holdings Co Ltd

Inventors

• Li Yu
• Ma Peng
• Zeng Yi
• Wang Shenglei
• Qian Tony

Classifications

• H03D7/1483

  comprising components for selecting a particular frequency component of the output · CPC title

• H03D7/1458

  Double balanced arrangements, i.e. where both input signals are differential · CPC title

• H03D7/1441 Primary

  using field-effect transistors (H03D7/145 takes precedence) · CPC title

• H03D7/165

  at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature (combined with amplitude demodulation H03D1/2245, combined with angle demodulation H03D3/007; N-path filters H03H19/002) · CPC title

• H03D7/1425 Primary

  with transistors · CPC title