Instrumentation system with combined voltage and current source

Details Instrumentation system with combined voltage and current source Instrumentation system with combined voltage and current source

1995-01-24

1997-08-05

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Converting input voltage to output current or vice versa

327100, 327403, 327407, 3241581, G05F 1569

Patent

active

056546548

ABSTRACT:
A combined voltage and current source for measurement systems including a single reference amplifier provided at the front end which receives a reference voltage for determining the level of the voltage or current source signal supplied at the output. CMOS switches or similar logic selects between current and voltage portions of the combined circuit. If the voltage function is selected, the reference amplifier controls a voltage regulator to maintain the output voltage approximately equal to the reference voltage applied at the input. If the current function is selected, the reference amplifier is configured as a voltage to current converter to establish a current through a precision resistor. A voltage follower circuit provides the current source signal referenced to a supply voltage for providing a positive current. In this manner, a single reference amplifier is used at the front end rather than two separate reference amplifiers provided in prior art. Reliable switch circuitry at the input replaces a relatively expensive and unreliable relay for switching between the voltage and current functions.

REFERENCES:
patent: 5039934 (1991-08-01), Banaska

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