Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-06-16
2000-07-18
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327538, G05F 110
Patent
active
060912863
ABSTRACT:
Mobility in an FET is used as a time standard to develop a resistance (or a transconductance or a current) reference which may be fully integrated and which is temperature stable to an arbitrary desired accuracy (or which varies with temperature in a desired fashion). The large temperature dependence of mobility is compensated (or adjusted to a desired variation characteristic) by applying a gate bias voltage having a predetermined variation in value with respect to temperature. In one embodiment the bias voltage of the FET is given a temperature dependence which results in the drain current of the FET being substantially constant with respect to temperature. This current is then used to charge or discharge a capacitor, yielding a precise R-C product which may be implemented fully in integrated form.
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Cunningham Terry D.
Philips Electronics North America Corporation
Wieghaus Brian J.
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