Amplifying circuit in which variable impedance circuit is used i

Details Amplifying circuit in which variable impedance circuit is used i Amplifying circuit in which variable impedance circuit is used i

1994-03-25

1995-09-19

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including gain control means

330 86, H03G 330

Patent

active

054519047

ABSTRACT:
An amplifying circuit includes: amplifying device for amplifying an input signal and outputting the amplified signal; feedback device for feeding the output signal from the amplifying device back to an input terminal of the amplifying device so that the output signal may have a predetermined frequency characteristic; and a variable impedance circuit which, included in the feedback device, operates on the basis of a current from a current source, and which has its impedance altered in accordance with the current.

REFERENCES:
patent: 4471324 (1984-09-01), Welland
patent: 4868516 (1989-09-01), Henderson et al.
patent: 5291151 (1994-03-01), Fujiwara et al.

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