Variable gain amplifying circuit

Details Variable gain amplifying circuit Variable gain amplifying circuit

2006-09-05

2006-09-05

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S254000

Reexamination Certificate

active

07102441

ABSTRACT:
A variable gain amplifying circuit, which applies a resistor ladder to obtain a more precise gain, is disclosed. The amplifying circuit includes an input, an operational amplifier (op-amp), a resistor unit and a feedback resistor. The feedback resistor is coupled between an output and an inverting input of the op-amp. The resistor unit includes at least one resistor ladder. The resistor unit further includes a switching unit for controlling whether the at least one resistor ladder is coupled between the input of the amplifying circuit and the inverting input of the op-amp. A differential amplifying circuit for more precise gain adjustment is also disclosed.

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patent: 6175278 (2001-01-01), Hasegawa
patent: 6545534 (2003-04-01), Mehr
patent: 6703682 (2004-03-01), Aswell

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