Reducing current supplied to an integrated circuit

Details Reducing current supplied to an integrated circuit Reducing current supplied to an integrated circuit

1993-05-25

1995-08-29

Dougherty, Thomas M.

Electricity: power supply or regulation systems

Output level responsive

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

G05F 140

Patent

active

054463670

ABSTRACT:
An integrated circuit of the present invention includes power regulating circuitry for reducing preregulator bias current. In one embodiment, power regulating circuitry includes a two stage preregulator for supplying current to a charge pump and a primary regulator. The first stage includes a high power operational amplifier for quickly establishing substrate bias and other pumped voltages before primary voltage is coupled to the remainder of the integrated circuit. Preregulated and pumped voltages are used to establish a reference voltage for the primary regulator. The second stage preregulator includes a low power series regulator to power the charge pumps and so maintain the reference voltage. When the primary regulator has generated the primary voltage level, the power regulating circuitry couples the primary voltage to the remainder of the integrated circuit and disables the first stage preregulator. Using circuitry and operating methods of the present invention, the total operating and standby current supplied to the integrated circuit no longer includes the bias currents related to the operation of the high power operational amplifier.

REFERENCES:
patent: 3806791 (1974-04-01), Johnson
patent: 4388537 (1983-06-01), Kanuma
patent: 5065361 (1991-11-01), Yoshizawa et al.

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