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High-low pass filter for high-power frequency modulation transmitter

A low-pass filter and high-pass filter technology, applied in the field of filters, can solve the problems of large error and slow filter tuning speed, and achieve the effects of fast selection, wide selection range, and reduction of tuning errors.

Pending Publication Date: 2021-02-02
天长市运臣电子工贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-low-pass filter that can be used in high-power FM transmitters to solve the problems of slow filter tuning and large errors in the prior art

Method used

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  • High-low pass filter for high-power frequency modulation transmitter
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  • High-low pass filter for high-power frequency modulation transmitter

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Embodiment Construction

[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention have been presented for purposes of illustration and description, but are not intended to be exhaustive or to limit the invention to the form disclosed. Many modifications and changes will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to better explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention and design various embodiments with various modifications as are suited to the particular use.

[0014] Such as figure 1 and figure 2 As shown, the technical solution of the present invention is a high-low-pass filter that can be used for high-power FM transmitters, including a filter bank and a selection circuit connected with the filter bank to select ...

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Abstract

The invention discloses a high-low pass filter for a high-power frequency modulation transmitter. The high-low pass filter comprises a filter bank and a selection circuit connected with the filter bank and used for filter frequency selection. The filter bank comprises a low-pass filter bank and a high-pass filter bank which are connected in series, and each of the low-pass filter bank and the high-pass filter bank comprises a plurality of low-pass filters which are connected in parallel and a plurality of high-pass filters which are connected in parallel. The selection circuit can select at least one low-pass filter or at least one high-pass filter to work or select one low-pass filter and one high-pass filter to work at the same time; wherein the selection circuit is provided with a relay, the relay is connected with a TTL drive circuit, the TTL drive circuit is connected with an MCU control unit, and the MCU control unit controls the relay to work through the TTL drive circuit. According to the high-low pass filter, the problems of low tuning speed and large error of a filter in the prior art are solved.

Description

technical field [0001] The invention belongs to the field of filters, and more specifically relates to a high-low pass filter that can be used in high-power FM transmitters. Background technique [0002] The filter allows useful signals to pass through without attenuation as much as possible, and attenuates unwanted signals as much as possible. The filter generally has two ports, one input signal and one output signal. Using this feature, a square wave group or composite noise that passes through the filter can be gated to obtain a waveform of a specific frequency. In the prior art, high and low frequency filters are most commonly used. Most of the existing high and low pass filters adopt mechanical tuning or numerical control tuning. The center frequency of the bandpass filter is adjusted by changing the capacitance value of the varactor diode in the tuning circuit, and the frequency band switching is realized through a PN tube with low forward impedance insertion loss. ....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02H04B1/04
CPCH03H17/0283H04B1/04
Inventor 刘春宏
Owner 天长市运臣电子工贸有限公司
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