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Image frequency rejection mixer

An image frequency suppression and mixer technology, applied in the field of communication, can solve problems such as difficulty in meeting requirements

Pending Publication Date: 2020-07-17
JINAN INSPUR HIGH TECH TECH DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a system with broadband and high rejection requirements, it is difficult to meet the requirements only by suppressing the image frequency through the device itself

Method used

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Embodiment Construction

[0036] In order to explain the overall concept of the present application more clearly, the following detailed description will be given by way of examples in combination with the accompanying drawings.

[0037] According to the first aspect of the embodiments of the present invention, the present invention provides an image rejection mixer, figure 1 The frame diagram of the first embodiment provided for the embodiment of the present invention, as shown in the figure, includes:

[0038] A signal receiver, the signal receiver is used to change the phase and couple the input signal to generate two signals with a specified phase difference;

[0039] A signal adjustment component, the signal adjustment component is connected to the signal receiver, and is used to adjust the phase and amplitude of the two signals with a specified phase difference respectively;

[0040] a mixer, the mixer is connected to the signal adjustment component, and is used to mix one of the two signals wit...

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Abstract

The invention relates to an image frequency rejection mixer, which comprises a signal receiver used for carrying out phase change and coupling on an input signal to generate two signals with a specified phase difference; a signal adjusting component connected with the signal receiver and used for separately adjusting the phases and amplitudes of the two signals with the specified phase difference;a frequency mixer connected with the signal adjusting component; and a signal transmitter connected with the two frequency mixers and used for combining the two frequency mixing signals to form an output signal of which the frequency is different from that of the input signal. A phase shift network and an adjusting network are arranged in an intermediate frequency circuit and a local oscillator,so that the phases of intermediate frequency signals (or local oscillator signals and low-frequency signals) input into two frequency mixers are completely orthogonal as much as possible, the amplitudes are basically consistent, the unbalance is reduced, and the image frequency suppression degree and the local oscillator signal suppression degree are optimized.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an image frequency suppression mixer. Background technique [0002] In a superheterodyne transceiver system, image frequency interference is a very important indicator. When the frequency bandwidth differs greatly, a mixer and a filter are usually used together to filter out image frequency interference. In zero-IF receivers, the image frequency suppression method is generally used, that is, the image frequency suppression mixer is used to keep the system running normally through the image frequency suppression function of the device itself. However, for systems with broadband and high rejection requirements, it is difficult to meet the requirements only by suppressing the image frequency through the device itself. Contents of the invention [0003] The present invention aims to solve the following technical problems at least to a certain extent: [0004] For communicat...

Claims

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Application Information

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IPC IPC(8): H03D7/16
CPCH03D7/16
Inventor 聂宏飞刘幼航刘强金长新
Owner JINAN INSPUR HIGH TECH TECH DEV CO LTD
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