Method and apparatus for increasing comparator gain without affe

Details Method and apparatus for increasing comparator gain without affe Method and apparatus for increasing comparator gain without affe

1998-12-21

2000-07-04

Nguyen, Matthew

Electricity: power supply or regulation systems

Self-regulating

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

307 66, 365229, G05F 156, H02J 700

Patent

active

06084390&

ABSTRACT:
A power supply switching circuit ensures stable, timely, and accurate transition between a primary power source and a secondary power source of an integrated circuit. A comparison element of the circuit compares a first voltage signal derived from a primary voltage of the primary power source to a second voltage signal, also derived from the primary voltage but having a different rate of change than the first voltage signal, to generate a compare output signal. The first and second voltage signals are characterized as being equal to each other when the primary voltage is equal to a predetermined crossover point at which the integrated circuit device will be powered by the primary voltage. When the primary voltage is less than the predetermined crossover point, a transistor element of a reference leg of a current mirror of the power supply switching circuit operates in back-bias mode and is sized large enough to ensure that the reference leg generates a large enough current to stabilize operation of the comparison element as the primary voltage ramps up until the primary voltage exceeds the predetermined crossover point.

REFERENCES:
patent: 4122359 (1978-10-01), Breikss
patent: 4451742 (1984-05-01), Aswell
patent: 4713555 (1987-12-01), Lee
patent: 4835417 (1989-05-01), Kousaka et al.
patent: 5099452 (1992-03-01), Yamakoshi et al.
patent: 5142217 (1992-08-01), Gontowski, Jr.

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