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Intelligent-tracking tunable band-pass filtering device

A technology of band-pass filtering and intelligent tracking, which is applied in the adjustment of resonant circuits, automatic frequency control, electrical components, etc., can solve the problems of small frequency difference, many filters, and difficulty in satisfying intelligent tracking and filtering, and achieve low cost, The design principle is simple and the effect of high reliability

Inactive Publication Date: 2009-12-23
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

However, in the frequency conversion system of a specific radio frequency signal source, the frequency of the local oscillator leakage signal, image signal and other spurious signals generated when the scanning local oscillator signal and the fixed radio frequency signal are converted are all variable, and their frequencies are very different. Small, such as using a switch filter device, which requires a large number of filters, this method is not advisable
If a YTF tunable ferrite bandpass filter device is used, its working frequency band is in the microwave band and the bandwidth is basically unchanged, and it is difficult to meet the needs of intelligent tracking and filtering of the up-conversion system in the RF signal generator

Method used

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Embodiment Construction

[0016] The implementation of the present invention and the working principle and features of the tunable bandpass filter device for intelligent tracking provided by the present invention will be further described below in conjunction with the accompanying drawings.

[0017] When the scanning local oscillator signal and the fixed radio frequency are up-converted, the frequency conversion product contains the leakage signal of the scanning local oscillator, the variable image signal, the variable useful signal, the multiple harmonics of the variable local oscillator leakage signal and the variable The multi-order intermodulation products of the multi-order intermodulation products, to filter the above-mentioned products, the present invention adopts a corresponding single-stage filter network according to whether the frequency of a single spurious signal changes, the frequency value, and the relative frequency difference between a single spurious signal and a useful signal Or a r...

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Abstract

The invention belongs to the technical field of signal filtering and provides an intelligent-tracking tunable band-pass filtering device which consists of a central processing unit, first, second, third and fourth DA converters, an RAM, an external data interruption and high-pass filter, a first band-stop resonance filter, a second band-stop resonance filter, a low-pass filter, an n-shaped resistance impedance matching device, as well as a first and a second single-chip integrated radio-frequency amplifier. The intelligent-tracking tunable band-pass filtering device adopts the high-pass filter with unchanged cut-off frequency to inhibit static stray signals (wherein the frequency and the power are unchanged), and adopts two band-stop resonance filters with changeable resonance frequency and one intelligent-tracking low-pass filter to constitute an intelligent-tracking filtering device which has changeable central frequency and changeable relative bandwidth to inhibit the static stray signals.

Description

Technical field [0001] The invention belongs to the technical field of signal filtering. More specifically, it is an intelligent method that is applied to extract the intermediate frequency signal after the frequency conversion of the signal in the radio frequency signal generator, and at the same time suppress the scanning local oscillator leakage signal, image signal, radio frequency leakage signal and other spurious signals. Tunable band-pass filtering device for tracking. Background technique [0002] At present, the design and construction principles of existing filter devices such as switch filter devices and YTF tunable ferrite band-pass filter devices are all designed based on the basic principle of band-pass filters. The characteristic of the switching filter device is that there are many bands, and the center frequency of each filter is unchanged, and the relative bandwidth is unchanged; the characteristic of YTF is that the center frequency is variable, and the a...

Claims

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Application Information

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IPC IPC(8): H03H11/04H03J7/00
Inventor 陈应兵朱健
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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