Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1988-05-24
1991-06-04
Wong, Peter S.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
363 63, 307261, G05F 324
Patent
active
050217305
ABSTRACT:
A bidirectional voltage to current converter circuit with extended dynamic range includes a first and second operational amplifier. The circuit's input voltage terminal is connected to the negative input of both operational amplifiers. The output of each operational amplifier directly drives the gates of two transistors which operate as a current mirror circuit. The two transistors associated with the first operational amplifier are p-channel transistors with their sources connected to VDD, and the two transistors driven by the second operational amplifier are n-channel transistors with their sources connected to ground. The drains of the first p-channel transistor and the first n-channel transistor are coupled back to the positive inputs of the first and second operational amplifiers respectively and also, through respective resistors, to a reference voltage. The drains of the second p-channel transistor and the second n-channel transistor are connected together to form a current output terminal.
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Dallas Semiconductor Corporation
Wong Peter S.
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