Amplifying circuit having bias voltage setting mechanism

Details Amplifying circuit having bias voltage setting mechanism Amplifying circuit having bias voltage setting mechanism

2008-07-01

2008-07-01

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S292000

Reexamination Certificate

active

07394317

ABSTRACT:
An amplifying circuit having a bias voltage setting mechanism includes: a first amplifying element that amplifies an input signal and outputs the amplified signal as an output signal; a bias voltage setting unit that generates a bias voltage from the output signal on the basis of a control signal, such as an AGC voltage; and a high impedance element (third resistor) by which the bias voltage is applied to an input portion of the first amplifying element and which, when a component for bias voltage setting, such as a fourth resistor, is externally provided in the bias voltage setting unit, prevents a capacitive component of the component for bias voltage setting from being equivalently connected with respect to the input portion.

REFERENCES:
patent: 4590613 (1986-05-01), Tannery, IV
patent: 4713628 (1987-12-01), Nelson
patent: 2862560 (1998-12-01), None
patent: 2001-156565 (2001-06-01), None

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