Monolithic integrated voltage regulator
US3946303A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1974 |
| Grant date | Mar 23, 1976 |
| Priority date | — |
| Expiry date | Apr 18, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/56
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A voltage regulator of the type suitable for production as a monolithic integrated circuit for use with a separate reference voltage source is composed of a differential amplifier having a so-called current mirror circuit coupling its outputs, followed by a current amplifying circuit from the output of which a feedback voltage obtained from a resistive divider is brought back to one input of the differential amplifier, the other input thereof being for connection to the reference voltage source. Stabilization of the regulator is obtained by connecting a small capacitance, of a magnitude suitable for provision as an element of a monolithic integrated circuit, between one of the poles of the supply voltage and the point of connection between the differential amplifier and the current amplifier circuit. The differential amplifier has a current source between common emitter connection and ground. The stability condition is worked out showing that the sum current of the differential amplifier must be unusually small. When a multi-transistor current amplifier is used, a second small capacitance is connected in to improve performance. The capacitances may be base-collector diodes, base-em…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.