Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1999-02-19
2000-09-12
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327541, 327512, 327378, G05F 302
Patent
active
06118330&
ABSTRACT:
A looped circuit for generating a variable bias voltage. The looped circuit includes a variable current source having a current output that is dependent upon the variable bias voltage. The looped circuit also includes a capacitor that is periodically coupled to the current source for a predetermined period of time, wherein the current source charges the capacitor during each predetermined period of time. At least one subcircuit is provided for varying the variable bias voltage, wherein the variable bias voltage automatically causes the current source to charge the capacitor to a predetermined reference voltage during each predetermined period of time. Accordingly, the generated bias voltage will vary with temperature and other external variables. However, the ratio of the current produced by the current source divided by the capacitance of the capacitor is equal to the ratio of the predetermined reference voltage divided by the referenced predetermined period of time. This ratio remains constant regardless of variations in process and temperature.
REFERENCES:
patent: 4885545 (1989-12-01), Sanielevici
patent: 5572161 (1996-11-01), Myers
patent: 5949274 (1999-09-01), Stanchak
Callahan Timothy P.
Luu An T.
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