Clock-referenced switching bias current generator

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

Patent

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Details

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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