Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1994-05-13
1996-12-10
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327543, 327308, G05F 110
Patent
active
055834647
ABSTRACT:
A resistor circuit includes a resistance control circuit and at least one insulated gate field effect transistor. The resistance control circuit includes a control signal output element including a reference transistor for generating a resistance control signal in response to an internal control signal to maintain the reference transistor at a selected resistance value and a resistance value control element including a reference resistor for generating a circuit control signal for controlling the resistance value of the reference transistor in relation to the resistance value provided by the reference resistor. The field effect transistor is controlled by the resistance control signal to provide a resistance value which is a function of the resistance value of the reference transistor (and therefore of the reference resistor) and ratios of selected physical characteristics of the reference transistor.
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Sedra & Smith, Microelectronic Circuits Saunders College Publishing, Philadelphia 1991.
Knight, Jr. Thomas F.
Parish Edward C.
Stewart William K.
Wade Jon P.
Callahan Timothy P.
Jordan Richard A.
Thinking Machines Corporation
Zweizig Jeffrey
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