Differential amplification circuit
US4264873A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 10, 1979 |
| Grant date | Apr 28, 1981 |
| Priority date | — |
| Expiry date | Jul 10, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45656
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential amplification is disclosed which comprises differential paired transistors. The direct bias current flowing in the differential paired transistors is determined by a constant current flowing from a first constant current circuit connected to the emitters of the differential paired transistors. The collector current of one of the differential paired transistors is caused to flow as an input current in a high-precision current mirror circuit. The current value of the constant current flowing in the first constant current circuit is set at 2Io. Since a direct base current Ib flows in the differential paired transistors, the current value of the collector current of one of the differential paired transistors is (Io-Ib). Accordingly, the high-precision current mirror circuit generates an output current of a current value of (Io-Ib) at the output terminal thereof. The differential amplification circuit includes a second constant current circuit having a current value Io corresponding to 1/2 of the current value of the constant current flowing in the first constant current circuit. A bias transistor is connected between the high-precision current mirror circuit and the seco…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.