Resistor circuit for integrated circuit chip using insulated field effect transistors
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United States of America Patent
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Dec 10, 1996
Grant Date -
N/A
app pub date -
May 13, 1994
filing date -
May 13, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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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