Patent · US Expired

Low voltage bias circuit for generating supply-independent bias voltages currents

US5825236A · kind A · utility

11Cited by
1References
20Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 19, 1997
Grant dateOct 20, 1998
Priority date—
Expiry dateMay 19, 2017

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG05F3/205
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

A CMOS bias circuit capable of operating down to a supply voltage equal to the sum of the threshold voltage and the saturation voltage. It generates a threshold referenced bias voltage which is independent of the supply voltage. This bias voltage is equal to the gate source voltage of a transistor which supplies a current equal to the gate-source voltage of another transistor divided by the resistance of a feedback resistor. Via the feedback resistor, changes in the supply voltage cause counteracting changes in the gate-source voltages of the transistors, resulting in a bias voltage which is substantially constant with changing supply voltage.

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