Bias circuit and semiconductor integrated circuit including...

Details Bias circuit and semiconductor integrated circuit including... Bias circuit and semiconductor integrated circuit including...

2008-05-28

2010-11-16

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

C330S285000

Reexamination Certificate

active

07834701

ABSTRACT:
A plurality of analog signals are input to input terminals of an analog signal processing circuit ANA2via respective capacitors C. In a bias circuit Bias for supplying a bias voltage such as a signal ground of the analog signals to the analog signal processing circuit ANA2, in an operational amplifier OpAS, a bias voltage VIr is input from a non-inverting input VIP of a built-in differentiate amplifier circuit, an output terminal of the built-in output amplifier circuit OA1is connected to an inverting input terminal VIM of the differentiate amplifier circuit DA, and thereby a voltage follower is obtained. Furthermore, a plurality of output amplifier circuits OA2through OAn are provided so that input terminals thereof are connected to output terminals of the differential amplifier circuit DA, and the output terminals are connected to input terminals IN1through INn of the analog signal processing circuit ANA2.

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