Transistor active filters using twin-T rejection networks

Bachmann A.E.

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Transistor active filters using twin-T rejection networks

机译：使用双T抑制网络的晶体管有源滤波器

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The introduction of a rejection-type network, such as a twin-T or a bridged-T, into the feedback loop of an amplifier leads to bandpass characteristics similar to those of single tuned circuits. It is possible to achieve highly selective circuits at very low frequencies, e.g. in the audio range, where high-Q-factor coils are usually physically large and expensive. Some basic circuits using a symmetrical twin-T network with R and C only in the feedback loop of a transistor amplifier are investigated. Results of measurements are given. Q-factors higher than 50 are obtained at a frequency of 600 c/s.

机译：在放大器的反馈环路中引入诸如双T型或桥接T型之类的抑制型网络会导致带通特性类似于单调谐电路。可以在非常低的频率下实现高选择性的电路，例如在音频范围内，高Q因数线圈通常在物理上较大且昂贵。研究了一些仅在晶体管放大器的反馈环路中使用带有R和C的对称Twin-T网络的基本电路。给出了测量结果。在600 c / s的频率下可获得高于50的Q因子。

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《Proceedings of the IEE - Part B: Radio and Electronic Engineering》 |1959年第26期|共5页
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Bachmann A.E.;
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Swiss PTT, Research Laboratory, Bern, Switzerland;

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Transistor active filters using twin-T rejection networks

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