Patent · US Expired

Constant current source having band-gap reference voltage source

US5497073A · kind A · utility

6Cited by

7References

4Claims

0Family size

Assignee

Temic Telefunken Microelectronik · DE

Inventors

Rolf Bo/ hme · Bad Friedrichshall, DE
Wolfgang Eckstein · Sereetz, DE
Jens Wirth · Heilbronn, DE

Key dates

Filing date	Dec 20, 1994
Grant date	Mar 5, 1996
Priority date	—
Expiry date	Dec 20, 2014

Classification

Technology area (CPC G)Physics
CPC primaryG04G19/02
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A constant current source that has a band-gap reference voltage source with three transistors, where the third transistor is connected with the input of a current balancing circuit whose output controls current sources for the first and second transistors of the band-gap reference voltage source as well as a current source for generating a constant output current and which can be connected via a resistor both with the operating voltage source and with the reference potential by the use of a switch. This circuit results in a low power consumption because it is switched on by the use of a switch only when required and in the switched-off state draws a minimum amount of leakage current.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.