Digitally controlled current source

Details Digitally controlled current source Digitally controlled current source

1989-09-07

1990-07-10

Salce, Patrick R.

Electricity: power supply or regulation systems

Output level responsive

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

323277, 323280, G05F 156

Patent

active

049409301

ABSTRACT:
A current source is controlled by the output signal from a digital to analog converter. The output signal from the digital to analog converter is applied to an amplifier unit. The output of the amplifier unit controls current through a pass transistor element, the pass transistor element current being the current applied to the load impedance. A feedback signal is generated by a differential amplifier in response to the current applied to the load impedance. The output signal from the difference amplifier is applied to an input terminal of the digital to analog converter with a polarity resulting in a change in the output signal of the amplifier unit which compensates for any change in the current through the load impedance. A voltage level changing element is included in the pass transistor control terminal to interrupt the current to the load impedance in the event of a degradation in the power supply.

REFERENCES:
patent: 4251743 (1981-02-01), Hareyama
patent: 4609864 (1986-09-01), Pommer
patent: 4678984 (1987-07-01), Henze
patent: 4750079 (1988-06-01), Fay et al.
patent: 4810948 (1989-03-01), Takuma

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