Current amplifier circuit
US4990864A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 7, 1990 |
| Grant date | Feb 5, 1991 |
| Priority date | — |
| Expiry date | Feb 7, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/343
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplifier circuit (10) is provided which comprises a first transistor (12) and a second transistor (14). A current buffer circuit (16) is coupled to the basis of the transistors (12, 14) to provide base drive current. A voltage proportional to absolute temperature, V.sub.PTAT, is applied between the emitters of the transistors (12,14). An input current is received by the transistor (12) and an output current is generated by the transistor (14). The output current I.sub.out is amplified with respect to the input current I.sub.in by a gain factor which is substantially independent of temperature considerations. Circuitry is provided for altering the value of the voltage proportional to the absolute temperature, V.sub.PTAT, such that the gain of the amplifier circuit (10) is programmable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.