Differential amplifier feedback current mirror
US4700144A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1985 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Oct 4, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/265
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A differential amplifier feedback current mirror includes a feedback current source that provides a correction current to one input of a differential amplifier. The correction current is synthesized by comparing a sample of the current delivered by a string of controlled current sources to a reference current set up by a constant current source. A current driver is included in the differential amplifier feedback loop and a current source buss is driven by the current driver. The feedback configuration assures that the current delivered by the dependent controlled current sources accurately tracks the current established by the reference current source, irrespective of the base current offset attributable to each of the dependent controlled current sources.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.