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对一个选频放大器来说,选择性是一个主要指标.而可调选择性的双T型选频放大器对于适应不同选择性的需要能提供便利,并且有实用价值.例如,在光电摄谱仪的记录部分电路中接有可调选择性选频放大器,就可通过调节通频带宽度达到需要的定值;又如在无线电遥控设备中需用不同的音频信号去调制载波,传送各种不同的控制信号,采用可调选择性选频放大器可以得到合适的选择性,以保证正确传递音频信号,防止其它干扰信号,不致于使控制失效. 本文拟就可调选择性双T选频放大器的设计进行一些介绍.
For a frequency selective amplifier, the selectivity is a major indicator, while the adjustable selectivity of the dual-T frequency selective amplifier for the needs of different selective to provide convenience and practical value.For example, in the photoelectric spectrograph Of the record part of the circuit connected to the adjustable selective frequency selective amplifier, you can adjust the passband to achieve the desired value; Another example is the need for radio remote control equipment to use different audio signals to modulate the carrier, to send a variety of different Control signal, the use of adjustable selective frequency selective amplifier can get the appropriate selectivity, in order to ensure the correct transmission of audio signals to prevent other interfering signals, will not make the control failure.This article intends to tune the selective dual-T frequency selective amplifier design Make some introduction