Clock-referenced switching bias current generator

Details Clock-referenced switching bias current generator Clock-referenced switching bias current generator

1998-01-15

2000-11-07

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327316, 323316, 323317, G05F 110

Patent

active

061442496

ABSTRACT:
A clock-referenced switching bias current source is disclosed wherein an accurate bias current is established based on the charge dissipated by a switching capacitor over a predetermined period. The time period is established by a very accurate system clock. The value of the capacitor can be accurately selected with .+-.10%. By selecting a particular capacitance and frequency, a desired average bias current value is determined according to the amount of charge dissipated over the predetermined period. In different embodiments, the bias current source can be configured to provide a bandgap current that is temperature and/or process independent.

REFERENCES:
patent: 4851719 (1989-07-01), Hitomi
patent: 5247241 (1993-09-01), Ueda

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