Bandgap reference circuit

Details Bandgap reference circuit Bandgap reference circuit

2005-02-08

2005-02-08

Vu, Bao Q. (Department: 2838)

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With individual charging of plural batteries or cells

C320S121000

Reexamination Certificate

active

06853164

ABSTRACT:
A bandgap reference circuit and method of using the same are provided. The bandgap reference circuit may provide start-up requirements at substantially any voltage and at substantially any temperature. The circuit comprises an op amp (two stages of transistors) and a network of resistors and bipolar diodes. When an artificial offset of about −5 mV is introduced to the op amp, the op amp output will be high as soon as the power supply exceeds the transistors' threshold voltages. The op amp output supplies the resistor and diode network and brings the op amp inputs within desired regulation voltages.

REFERENCES:
patent: 3617859 (1971-11-01), Dobkin et al.
patent: 3887863 (1975-06-01), Brokaw
patent: 4383188 (1983-05-01), Crosby
patent: 4433283 (1984-02-01), Gersbach
patent: 4525663 (1985-06-01), Henry
patent: 4595874 (1986-06-01), Hein et al.
patent: 4780624 (1988-10-01), Nicollini et al.
patent: 4906863 (1990-03-01), Van Tran
patent: 5087830 (1992-02-01), Cave et al.

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