Voltage controlled current source

Electricity: power supply or regulation systems – External or operator controlled – Using a three or more terminal semiconductive device as the...

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Details

323351, 323354, G05F 156

Patent

active

050971999

ABSTRACT:
A seven decade, voltage controlled current source is described for use in testing intermediate range nuclear instruments that covers the entire test current range of from 10 picoamperes to 100 microamperes. High accuracy is obtained throughout the entire seven decades of output current with circuitry that includes a coordinated switching scheme responsive to the input signal from a hybrid computer to control the input voltage to an antilog amplifier, and to selectively connect a resistance to the antilog amplifier output to provide a continuous output current source as a function of a preset range of input voltage. An operator controlled switch provides current adjustment for operation in either a real-time simulation test mode or a time response test mode.

REFERENCES:
patent: 4145649 (1979-03-01), Pickton
patent: 4441068 (1984-04-01), Smith
patent: 4485342 (1984-11-01), Hill

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