Frequency mixing circuit and method for suppressing local oscillation leakage in frequency mixing circuit

Patent metadata

Field	Value
Publication number	US-8947151-B2
Application number	US-201314043116-A
Country	US
Kind code	B2
Filing date	Oct 1, 2013
Priority date	Apr 2, 2011
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

Embodiments of the present invention disclose a frequency mixing circuit and a method for suppressing local oscillation leakage in the frequency mixing circuit, where a mixed input signal and a local oscillation signal are involved, and local oscillation leakage can be effectively reduced by using a frequency mixing circuit whose structure is simpler and is easier to be implemented. The frequency mixing circuit includes a direct current bias circuit, where the direct current bias circuit includes a direct current bias voltage source used for reducing a local oscillation current. The frequency mixing circuit is mainly applied to frequency mixing, and especially to a case where an intermediate frequency signal is mixed with a local oscillation signal to output a radio frequency signal.

First claim

What is claimed is:

1. A frequency mixing circuit, comprising:
a 90-degree bridge to pass through an input signal to generate a first input signal and a second input signal;
an orthogonal frequency mixer, the orthogonal frequency mixer comprises:
a first frequency mixing circuit to mix the generated first input signal with an oscillation signal of the first frequency mixing circuit,
a second frequency mixing circuit to mix the generated second input signal with an oscillation…

Assignees

• Huawei Tech Co Ltd

Inventors

• Cai Hua
• Shuai Songlin
• He Jia
• Zhang Yong

Classifications

• H04B1/30

  Electricity · mapped topic

• H03D7/1491 Primary

  Electricity · mapped topic

• H03D7/00 Primary

  Electricity · mapped topic

• H03D7/18

  Electricity · mapped topic

• H03D2200/0045

  Electricity · mapped topic