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Quadrature mixer circuit

A double-balanced mixer and circuit technology, applied in electrical components, multi-frequency modulation conversion, modulation transfer and other directions, can solve the problems of useful intermediate frequency signal interference, system noise performance deterioration, affecting sensitivity and other problems, achieve low conversion loss, improve The effect of image rejection and LO RF signal isolation

Inactive Publication Date: 2020-12-22
BEIJING INST OF RADIO MEASUREMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the heterodyne receiver system, the image frequency noise and the useful signal are mixed with the local oscillator at the same time, causing interference to the useful intermediate frequency signal, resulting in deterioration of the system noise performance and affecting the sensitivity

Method used

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Embodiment Construction

[0056] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0057] like figure 1 As shown, a quadrature mixer circuit according to an embodiment of the present invention includes a double-balanced mixer, a Lange coupler and a power divider. Wherein, the power divider can output two radio frequency signals of equal amplitude and in phase; the Lange coupler can provide two equal amplitude and quadrature local oscillator signals, marked as "0" and "-90" in the figure The equal-amplitude quadrature local oscillator signals output by the two output terminals of the drive double-balance...

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PUM

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Abstract

The invention discloses a quadrature mixer circuit, which comprises a power divider module, a Lange coupler module and a double-balanced mixer module, wherein the power divider module converts a radiofrequency input signal into a first radio frequency signal and a second radio frequency signal which have the equal amplitude and the same phase; the Lange coupler converts a local oscillator input signal into a first local oscillator signal and a second local oscillator signal which are equal in amplitude and orthogonal; and the double-balanced mixer module receives the radio frequency signal and the local oscillator signal and outputs four intermediate frequency signals with phase differences of 90 degrees.

Description

technical field [0001] The invention relates to the technical field of millimeter wave signal processing. More specifically, it relates to a quadrature mixer circuit. Background technique [0002] The mixer is an indispensable and important component in the radio frequency microwave circuit system. Whether it is microwave communication, radar, remote control, remote sensing, or reconnaissance and electronic countermeasures, as well as many microwave measurement systems, it is necessary to reduce the microwave signal to an intermediate frequency with a mixer for processing. [0003] At present, in the heterodyne receiver system, the image frequency noise and the useful signal are mixed with the local oscillator at the same time, causing interference to the useful intermediate frequency signal, deteriorating the system noise performance and affecting the sensitivity. Therefore, image frequency suppression is particularly important for the anti-interference ability of the sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16
CPCH03D7/165
Inventor 张曳万祥杨帆林能杰
Owner BEIJING INST OF RADIO MEASUREMENT
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