Zero intermediate frequency direct current compensation circuit and method

A technology of zero intermediate frequency and DC component, which is applied in the field of analog signal processing, can solve the problems of large signal loss, the inability of DC signals to pass through DC blocking capacitors, complex structures, etc., and achieve the effect of avoiding amplifier saturation
CN103457623AInactive Publication Date: 2013-12-18WUHAN BINHU ELECTRONICS
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN BINHU ELECTRONICS
Publication Date
2013-12-18
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention belongs to the technical field of analog signal processing, and particularly relates to a circuit and method which can conduct direct current compensation on the intermediate frequency end of a zero intermediate frequency receiver to remove direct current components generated during frequency mixing in real time. According to the zero intermediate frequency direct current compensation circuit and method, only alternating current components are left in intermediate frequency signals by removing the direct current components generated by continuous wave frequency conversion in real time, accordingly, sufficient gain can be provided, and the zero intermediate frequency signals are amplified to be within a scope suitable for A / D converter collection.
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Description

technical field

[0001] The invention belongs to the technical field of analog signal processing, and in particular relates to a circuit and method for performing DC cancellation at an intermediate frequency end of a zero-IF receiver and removing DC components generated during frequency mixing in real time. Background technique

[0002] The basic working principle of the zero-IF receiver is: the radio frequency signal and the local oscillator with the same carrier frequency are directly converted to zero-IF after a down-conversion, and then the useful signal in the zero-IF signal is extracted through amplification and low-pass filtering.

[0003] Compared with the traditional superheterodyne receiver, the RF signal of the zero-IF receiver has no image frequency and does not need an image rejection filter. The basic frequency signal after frequency conversion is at a low frequency (generally lower than 10kHz), and the amplifying circuit can use an ordinary operational amplifie...

Claims

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