Bias circuits

Details Bias circuits Bias circuits

2005-09-13

2008-11-04

Zweizig, Jeffrey S (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S512000

Reexamination Certificate

active

07446598

ABSTRACT:
A bias circuit for use in bandgap voltage reference circuits and temperature sensors comprises a pair of transistors (Q, Q2), the first of which (Q1) is arranged to be biased at an emitter currentlbias, and the second of which (Q2) is arranged to be biased at an emitter current of m.lbias. The circuit is arranged such that the difference between the base-emitter voltages of the transistors is generated in part across a first resistance means having a valueRbiasand in use carrying a bias current equal tolbiasand in part across a second resistance means of value substantially equal toRbias/mand in use carrying a current equal to the base current of the second transistor. This results in use in a bias current Ibiaswhich, when used to bias a substrate bipolar transistor via its emitter, produces a collector current therefrom which is substantially PTAT and a base-emitter voltage which is substantially independent of the forward current gain of the substrate bipolar transistor.

REFERENCES:
patent: 6242897 (2001-06-01), Savage et al.
patent: 6933770 (2005-08-01), Ranucci
patent: 7053694 (2006-05-01), Ozawa
patent: 7071767 (2006-07-01), Ou-yang et al.
patent: 7215183 (2007-05-01), Nakada

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