Accurate reference generation technique valid during system powe

Details Accurate reference generation technique valid during system powe Accurate reference generation technique valid during system powe

1994-04-11

1996-06-25

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327539, 327540, 327331, H03L 500

Patent

active

055303986

ABSTRACT:
A circuit for converting a system supply voltage having one of two levels to a voltage for use by an integrated analog circuit connected to the system upon power-up. The circuit uses a diode-connected transistor to generate a reference voltage necessary for a regulator to regulate the supply voltage when the supply voltage is first powered up. The regulated supply voltage is doubled to a voltage level sufficient to activate the integrated analog circuit's bandgap voltage. The activated bandgap voltage is thus switched on to supply a more precise reference voltage to the regulator so that the diode-connected transistor may be de-activated to conserve power. The circuit also provides a bypass path for connecting the supply voltage directly to the integrated analog circuit when the supply voltage is the same level as the necessary voltage for the integrated analog circuit.

REFERENCES:
patent: 4382198 (1983-05-01), Ishijima et al.
patent: 5132565 (1992-07-01), Kuzumoto
patent: 5235222 (1993-08-01), Kondoh et al.
patent: 5280455 (1994-01-01), Kanaishi
patent: 5347170 (1994-09-01), Hayakawa et al.
patent: 5382839 (1995-01-01), Shinohara

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