Start-up circuit and method for a self-biased...

Details Start-up circuit and method for a self-biased... Start-up circuit and method for a self-biased...

2011-03-29

2011-03-29

Vu, Bao Q (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

C323S313000, C323S314000, C323S315000

Reexamination Certificate

active

07915882

ABSTRACT:
A current reference circuit is disclosed. A small startup current is defined as the base current into a bipolar transistor with its collector-emitter path connected in series with a resistor between the power supply voltage and ground. This startup current is conducted via a diode-connected MOS transistor in a first leg of a current mirror. Temperature compensation is maintained by a reference leg in the current mirror that includes a bipolar transistor having an emitter area N times larger than that of a bipolar transistor in a second leg of the current mirror, to establish a temperature-compensated current in the reference leg. A compensation capacitor connected between the collector and base of a bipolar transistor in the first leg suppresses oscillation, and can be modest in size due to the Miller effect.

REFERENCES:
patent: 4234841 (1980-11-01), Schade, Jr.
patent: 4359680 (1982-11-01), Hellums et al.
patent: 11102230 (1999-04-01), None
patent: 2000148268 (2000-05-01), None
patent: 2001344028 (2001-12-01), None

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