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Adjustable simple low-pass filtering circuit

A low-pass filter circuit, a simple technology, applied in the direction of electrical components, impedance networks, multi-terminal pair networks, etc., can solve the problems of large system volume, small bandwidth, and applicability limitations, and achieve small volume, simple structure, and high stability Effect

Inactive Publication Date: 2014-12-10
王少夫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its design structure can only be used in a specific frequency band, and the bandwidth is small, which makes the system larger and less versatile
At the same time, due to the problem of its circuit structure, the traditional low-pass filter circuit is extremely sensitive to temperature, and its applicability is greatly limited.

Method used

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Embodiment Construction

[0008] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0009] to combine figure 1 , the present invention is an adjustable simple low-pass filter circuit, including an input port 1, an output port 2, an inductor, and three adjustable capacitors; the inductor with capacitance Connected in parallel, one end is connected to port 1, the other end is connected to port 2; the other two capacitors respectively with The two ends of the connection are connected; the capacitor The other end of the ground. Both input port 1 and output port 2 are connected with 50 ohm impedance.

[0010] to combine figure 2 , when the inductance is fixed, the adjustable capacitance , When changing, it can be seen from the simulation results that this low-pass filter circuit can be effectively adjusted. The designed adjustable low-pass filter has been successfully used in a pulse multi-channel receiver. After FSK modulation an...

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Abstract

The invention discloses an adjustable simple low-pass filtering circuit which is composed of an inductor and an adjustable capacitor. The adjustable simple low-pass filtering circuit can be widely applied to devices with high requirements for the signal performance, such as WCDMA (Wideband code division multiple access) mobile communication power amplifiers and radar antenna. The adjustable simple low-pass filtering circuit can restrain out-of-band noise and improve stability of electronic circuits. Meanwhile, compared with the low-pass filtering circuits in other structures, the adjustable simple low-pass filtering circuit can achieve adjustable low-pass filtering and be applied to different frequency bands of a communication system.

Description

technical field [0001] The invention belongs to the field of communication and electronic application, especially has important application in filter and matching network. Background technique [0002] In recent years, a series of researches on filter circuits have been carried out at home and abroad. A lot of research results have been obtained, especially in mobile communication technology, the filter circuit can effectively solve the problem of large noise outside the passband of the system when used in the front end of the power amplifier and the feeder part of the radar antenna. However, its design structure can only be used in a specific frequency band, and the bandwidth is small, which makes the system larger and less versatile. At the same time, the traditional low-pass filter circuit is extremely sensitive to temperature due to its circuit structure, and its applicability is greatly limited. The present invention can effectively solve the above problems to meet t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/09
Inventor 不公告发明人
Owner 王少夫