Intermediate frequency processing circuit and implementation method

Abstract

The invention relates to the field of intermediate frequency signal processing of an electronic measuring instrument, in particular to an intermediate frequency processing circuit and implementation method. The intermediate frequency processing circuit comprises an intermediate frequency conditioning module, an A / D acquisition module, a clock generation module, an intermediate frequency signal output module, and a control module. The intermediate frequency processing implementation method uses down-conversion, multi-stage combined filtering, multi-stage amplification and flatness control technologies, which can realize anti-aliasing filtering of A / D sampling, and reduce the cost, power consumption, volume and weight; and the intermediate frequency processing implementation method uses a programmable sampling clock generation circuit, which can provide an intermediate frequency signal before or after the down-conversion for external processing. A dynamic closed-loop control circuit consisting of "a two-stage amplifying circuit with the control module, an A / D conversion circuit, a flatness adjustment circuit, and the A / D acquisition module" is built, which is used to ensure that theADC has no full bias overflow.

Description

technical field [0001] The invention relates to the field of intermediate frequency signal processing of electronic measuring instruments, in particular to an intermediate frequency processing circuit and a realization method. Background technique [0002] At present, hand-held instruments (such as spectrum analyzers) can better meet the needs of on-site (such as traditional factories and laboratories, etc.) testing because of their small size, light weight, and portability. / On-site diagnosis has good adaptability and has been widely used in every corner of the national economy and security. In order to realize the overall design of the handheld instrument under the condition of limited size, weight and power consumption, "IF signal processing" is one of the cores of the analog-to-digital conversion of the instrument. Realizing its circuit design under power consumption is a very challenging and meaningful work. [0003] The intermediate frequency processing of existing ...

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Problems solved by technology

[0005] Therefore, the present invention is developed to solve the above problems, and its purpose is to provide a gain-controllable intermediate frequency processing circuit and implementation method based on down-conversion, multi-stage combined filtering, and multi-stage amplification, aiming to solve the existing To solve problems such as large technical power consumption, large occupied volume, large weight and high cost, the following technical solutions are adopted:

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