Current mirror power amplifier with gain controlled by resistor-capacitor network
US5285172A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1992 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Sep 2, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/3066
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplifier in which a current mirror circuit 53 is formed of a transistor Q25 on the input side and a transistor Q26 on the output side. The base-emitter junction area of the transistor Q26 is set to be N (N>1) times as large as that of the transistor Q25. A parallel circuit of a resistor R25 and a capacitor C25 is connected between the base of the transistor Q25 and its bias point Q27. A resistor R26 is connected between the base of the transistor Q26 and the bias point Q27. The resistance value of the resistor R25 is set to be virtually N times as large as the resistance value of the resistor R26. When an input current i25 is supplied to the transistor Q25, an output current i26, which is N times as large as the input current, is obtained from the transistor Q26 on the output side, whereas the output current i26 is held lower than N times of the input current i25 when the frequency of the input current is high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.