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Image rejection filter based on improved gm-c and its construction method

A technology of image suppression and construction method, which is applied in the field of signal processing, can solve the problems of large interference of useful signals and affect the performance of low-IF receivers, etc., and achieve the effects of low power consumption, good application prospects, and high image rejection ratio

Active Publication Date: 2021-06-18
NANJING UNIV OF POSTS & TELECOMM +1
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the existing low-IF receiver adopts a heterodyne structure, and the image signal interferes greatly with the useful signal, which will seriously affect the performance of the low-IF receiver.

Method used

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  • Image rejection filter based on improved gm-c and its construction method
  • Image rejection filter based on improved gm-c and its construction method
  • Image rejection filter based on improved gm-c and its construction method

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] Such as figure 1 As shown, the image rejection filter based on the improved Gm-C of the present invention includes a bias circuit, several stages of improved Gm-C filters, and the bias circuits are respectively in phase with each stage of improved Gm-C filters The improved Gm-C filters at all levels are cascaded in turn to form an image rejection filter with the same order as the improved Gm-C filter. The input terminal of the first stage improved Gm-C filter is connected to the input signal The terminals are connected, and the output terminal of the last stage improved Gm-C filter is used as the output signal terminal of the image rejection filter,

[0037] Such as figure 2 As shown, the improved Gm-C filters at all levels include two sets of Gm1 transconductance units, two sets of Gm2 transconductance units and two sets of GmR transconductance units,

[00...

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Abstract

The invention discloses an image rejection filter based on improved Gm-C and a construction method thereof, including a bias circuit and several stages of improved Gm-C filters, and the bias circuits are respectively connected with each stage of improved Gm-C The C filters are connected, and the improved Gm-C filters at all levels are cascaded in turn to form an image rejection filter with the same order as the improved Gm-C filter. The input of the first-stage improved Gm-C filter The terminal is connected to the input signal terminal, and the output terminal of the last stage improved Gm-C filter is used as the output signal terminal of the image rejection filter. The image rejection filter based on improved Gm-C of the present invention and construction method thereof, it adopts the improved Gm-C filter constructed by transconductance amplifier and electric capacity, carries out low-pass filtering and frequency transfer to input signal, through simulation result It shows that the filter has a high image rejection ratio and low power consumption, so it has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to an image rejection filter based on an improved Gm-C and a construction method thereof. Background technique [0002] Low-IF receivers have the advantages of low power consumption, low cost and high integration. At present, it has been widely used in modern wireless communications, such as radio, television, mobile communications and satellite communications. However, since the low-IF receiver adopts a heterodyne structure, the image signal interferes greatly with the useful signal, which will seriously affect the performance of the low-IF receiver. Therefore, the suppression of the image signal is an important problem to be solved in the low-IF receiver, and it is an urgent problem to be solved at present. Contents of the invention [0003] The purpose of the present invention is to overcome the problem that the existing low-IF receiver adopts a heterodyne structure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H11/04H03H11/12
CPCH03H11/0422H03H11/0466H03H11/1217
Inventor 张瑛李佳阳
Owner NANJING UNIV OF POSTS & TELECOMM
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