US Patent Application 20100052790 - AMPLIFIER CIRCUIT

Application 20100052790 Filed on August 26, 2009. Published on March 4, 2010

Abstract Claims Description Full Text

Inventors

Tsunoda, Yukito
Sugawara, Mariko

Assignee

Fujitsu Limited

US Classes

330/291, Including signal feedback means330/310Including plural stages cascaded

Attorney, Agent or Firm

Fujitsu Patent Center;C/O CPA Global

Foreign Documents

2008-220000 JP 08/28/2008

International Class

H03F 3/04

Issued Patent Number:

8164385

Abstract text

An amplifier circuit includes a first amplifier amplifying an input signal and outputting a first amplified signal, a second amplifier amplifying the first amplified signal and outputting a second amplified signal, and a feedback circuitry feeding back the second amplified signal to the input of the second amplifier. The feedback circuitry includes a feedback transistor that keeps the input level of the second amplifier constant.

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