Programmable precision current controlling apparatus

Details Programmable precision current controlling apparatus Programmable precision current controlling apparatus

2005-02-22

2005-02-22

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

Reexamination Certificate

active

06859157

ABSTRACT:
The present invention is a circuit for controlling current. In one embodiment, the high reference voltage input of a digital to analog converter is coupled with a reference voltage source which provides a positive reference voltage. A resistive load is coupled to an output of the digital to analog converter and to a circuit output pin. A sensing device couples the circuit output pin with the low reference voltage input of the digital to analog converter and to a reference ground input of the voltage source. The positive reference voltage, low reference voltage, and reference ground voltage are changed in response to the sensing device detecting a change in the output voltage.

REFERENCES:
patent: 4490634 (1984-12-01), Hareyama
patent: 4701694 (1987-10-01), Penney et al.
patent: 4897555 (1990-01-01), Reed
patent: 5530399 (1996-06-01), Chambers et al.
patent: 5815103 (1998-09-01), Comminges et al.
patent: 6157332 (2000-12-01), Frank et al.
Engineering Staff of Analog Devices, Analog-Digital Conversion Handbook, 1984, Editor Daniel Sheingold, Prentice-Hall, Third Edition, pp. 611-614.

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