Voltage-to-current converter

Details Voltage-to-current converter Voltage-to-current converter

1996-01-04

1997-05-13

Hecker, Stuart N.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323316, G05F 316, G05F 320

Patent

active

056296142

ABSTRACT:
A voltage-to-current converter makes it possible to control conversion of a voltage to a current by considering the size of a transistor irrespective of supply voltage, input voltage, and fabrication conditions. It includes an operational amplifier for receiving a constant-voltage source to a noninverting terminal, and amplifying the voltage; a converting circuit for converting the input voltage to current after receiving the output voltage from the operational amplifier as an input; a current mirror for receiving the output current from the converting circuit as an input, and enabling two transistors of the current mirror to flow the same current; an electric potential holding circuit for maintaining two electric potentials which are applied on respective drain terminals of the two transistors of the current mirror to be equal; and an output current mirror for constantly maintaining current flowing out from the current mirror, which biases the electric potential of a drain terminal of the second transistor used in the current mirror with a predetermined value, and flows a constant voltage to the constant-current source output terminal.

REFERENCES:
patent: 5014020 (1991-05-01), Hayashi et al.
patent: 5434499 (1995-07-01), Narikawa et al.
patent: 5519310 (1996-05-01), Bartlett
patent: 5545972 (1996-08-01), Kiehl

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