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High-speed reaction type low-pass filter, filter circuit and control method

A low-pass filter, high-speed response technology, applied in electrical components, impedance networks, multi-terminal-to-network, etc., can solve the problems of poor load-carrying capacity of passive filters and difficult to meet application requirements, etc., to improve the corner frequency and speed up the circuit. effect of reaction

Inactive Publication Date: 2019-04-26
SHENZHEN BETTERLIFE ELECTRONICS SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the load capacity of this passive filter is quite poor, and it is difficult to meet the application requirements

Method used

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  • High-speed reaction type low-pass filter, filter circuit and control method
  • High-speed reaction type low-pass filter, filter circuit and control method
  • High-speed reaction type low-pass filter, filter circuit and control method

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Embodiment Construction

[0023] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.

[0024] The invention discloses a high-speed response low-pass filter, please refer to Figure 5 , which includes an operational amplifier U1 and a switch Φb1, a switch Φa1, a switch Φb2, a switch Φa2, a switch Φb3 and a switch Φa3 connected in series in sequence, the front end of the switch Φb1 serves as the input end of the low-pass filter, and the switch Φb1 The rear end of the switch Φa1 is grounded through the capacitor C1, the rear end of the switch Φa1 is grounded through the capacitor C2, the rear end of the switch Φb2 is grounded through the capacitor C3, the rear end of the switch Φb3 is grounded through the capacitor C4, and the rear end of the switch Φa3 terminal is connected to the non-inverting terminal of the operational amplifier U1, the rear end of the switch Φa2 is connected to the output terminal of the operational amplifier U1 ...

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Abstract

The invention discloses a high-speed reaction type low-pass filter, comprising an operational amplifier U1 and a switch phib1, a switch phia1, a switch phib2, a switch phia2, a switch phib3 and a switch phia3 that are sequentially connected in series, wherein the front end of the switch phib1 serves as the input end of the low-pass filter, the rear end of the switch phib1 is grounded through a capacitor C1, the rear end of the switch phia1 is grounded through a capacitor C2, the rear end of the switch phib2 is grounded through a capacitor C3, the rear end of the switch phib3 is grounded through a capacitor C4, the rear end of the switch phia3 is connected to the non-inverting end of the operational amplifier U1, the rear end of the switch phia2 is connected to the output end of the phase of the operational amplifier U1 through a capacitor C5, and the output end and the inverting end of the operational amplifier U1 are connected to each other to serve as the output end of the low-pass filter. According to the scheme of the invention, the angular frequency of low-pass filtering is reduced in the case of not reducing the channel switching speed, and thus the adverse influence of noiseon signals can be further reduced.

Description

technical field [0001] The invention relates to a low-pass filter, in particular to a high-speed response low-pass filter, a filter circuit and a control method. Background technique [0002] Filters are widely used in signal processing circuits. In the field of analog signal processing and communication, filters are used to filter noise. In the field of communication, they are used to separate and process different frequency bands. Especially in wireless communication, signals are related to The carrier wave is mixed by the mixer and then sent out, while the receiver passes the signal through a filter to filter the carrier signal to advance useful information. Usually, one-section filter is 20dB / decade, and three-section filter is only 60dB / decade, so there must be a difference of ten times between the corner frequency and the frequency of the signal. However, when the corner frequency is too low, the output signal will respond very slowly. Moreover, the different channel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/12
CPCH03H11/126
Inventor 范国良张弛余佳
Owner SHENZHEN BETTERLIFE ELECTRONICS SCI & TECH
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