Active filter

Details Active filter Active filter

1996-06-14

1997-12-16

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330303, 330306, H03F 3191

Patent

active

056990197

ABSTRACT:
There is provided an active filter, having a first high-pass filter for receiving an input signal, performing filter processing of the input signal, and outputting a first signal, a second high-pass filter, an input terminal of which is connected to an output terminal of said first high-pass filter, and which receives the first signal, performs filter processing, and outputs a second signal, a differential amplifier, one input terminal of which is connected to an output terminal of said second high-pass filter to receive the second signal, the other input terminal of which is connected to the output terminal of said first high-pass filter to receive the first signal, and which outputs a third signal obtained by multiplying a difference between the first and second signals with a gain, and an adder for receiving and adding the third signal output from said differential amplifier and the input signal, and outputting a sum signal. Since the active filter can be constituted by the first and second high-pass filters, the differential amplifier, and the adder, the number of elements is reduced.

REFERENCES:
patent: 3969682 (1976-07-01), Rossum
patent: 4560963 (1985-12-01), Sharpe
patent: 5610551 (1997-03-01), Hosoya
Elektor Electronics, vol. 3, No. 5, pp. 43-45, May 1977, "Music Cleaner".
Radio and Electronic Engineer, vol. 33, No. 3, pp. 184-186, Mar. 1967, A. Woroncow, et al., "Inductorless Band-Pass I.F. Amflifiers".

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