Initialization circuit for automatically establishing an output

Details Initialization circuit for automatically establishing an output Initialization circuit for automatically establishing an output

1993-03-05

1994-12-27

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

377 56, 327198, 327307, 327341, 327156, 327538, G05F 100

Patent

active

053768345

ABSTRACT:
A circuit for initializing the output voltage of an analog circuit includes a switch operative to connect an input of the analog circuit to a first reference potential during an initializing period. A comparator is connected to compare the output voltage of the analog circuit with a second reference potential to produce an output representing the comparison. A resistor ladder having a plurality of voltage step output lines along its length is connected to inputs of a multiplexer, the multiplexer having an output connected to bias the analog circuit. A counter having a clock input and a count output is connected with the count output connected to operate the multiplexer to sequentially select among the steps of the resistor ladder. A circuit clocks the counter until the output of the comparator reaches a predetermined value, wherein a voltage step output line of the resistor ladder is selected to control the output of the multiplexer.

REFERENCES:
patent: 3857104 (1974-12-01), Sacks
patent: 4140874 (1974-02-01), Thomas
patent: 4621204 (1986-11-01), Loessel et al.
patent: 4707624 (1987-11-01), Yee

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