Current mirror using resistor ratios in CMOS process

Details Current mirror using resistor ratios in CMOS process Current mirror using resistor ratios in CMOS process

1990-01-05

1991-06-18

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

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

323273, G05F 1575

Patent

active

050252046

ABSTRACT:
An operational amplifier drives the gate of a voltage controlled variation resistor having a source terminal coupled in series to a reference voltage through a current sense resistor and a drain terminal coupled in series to a supply voltage via a current regulated component, e.g., a light emitting diode. Voltage across the current sense resistor feeds back to the inverting input of the operational amplifier. The non-inverting input receives a substantially constant voltage corresponding to a target voltage, the voltage at the current sense resistor when the desired current flows therethrough. The operational amplifier varies the resistance of the variation resistor to maintain the target voltage at the current sense resistor and establish the desired current flow.

REFERENCES:
patent: 4019096 (1977-04-01), Bullinga
patent: 4251743 (1981-02-01), Hareyama
patent: 4404473 (1983-09-01), Fox

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