Bias circuit and semiconductor integrated circuit including the bias circuit
US7834701B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 2008 |
| Grant date | Nov 16, 2010 |
| Priority date | — |
| Expiry date | Jun 5, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45136
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A plurality of analog signals are input to input terminals of an analog signal processing circuit ANA2 via 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 OA1 is 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 OA2 through 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 IN1 through INn of the analog signal processing circuit ANA2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.