Base current compensation circuit
US5617056A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Jul 5, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/265
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A base current compensation circuit (10) generates a current that tracks a gain of a transistor (11). The compensation circuit (10) includes a current mirror formed by a mirror transistor (12) and an output transistor (14). The mirror transistor (12) is connected to the transistor (11) whose gain is tracked. A current source (16) and a feedback transistor (13) causes the mirror transistor (12) to draw a base current from the transistor (11) so that a collector current of the transistor (11) matches a reference current. The output transistor (14) amplifies the base current of the transistor (11) to generate the tracking current in the collector electrode of the output transistor (14).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.