Floating output digital to analog converter

Details Floating output digital to analog converter Floating output digital to analog converter

1989-10-27

1990-10-02

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323281, 323349, 323354, 341154, G05F 156

Patent

active

049610457

ABSTRACT:
A digital to analog converter circuit produces an output voltage which includes a small error voltage floating on a larger direct current voltage component. The circuit includes a controlled current supply coupled to the emitter of an NPN transistor to which the direct current voltage component is supplied to the base thereof. The error voltage is generated by modulating the current through the transistor by controlling the current supply, independent of the voltage component supplied to its base, such that the output voltage occurring at the emitter of the transistor is a function of the difference between the direct current component and the natural log of the modulated emitter current.

REFERENCES:
patent: 4251743 (1981-02-01), Hareyama
patent: 4292625 (1981-09-01), Schoeff
patent: 4349777 (1982-09-01), Mitamura
patent: 4354159 (1982-10-01), Schorr et al.
patent: 4414501 (1983-11-01), Bedard et al.
patent: 4810948 (1989-03-01), Takuma

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