Analog to digital signal conversion

Details Analog to digital signal conversion Analog to digital signal conversion

1992-12-14

1994-10-04

Callahan, Timothy P.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307351, 307352, 307494, 307491, H03K 524

Patent

active

053529383

ABSTRACT:
A digital equivalent of a periodic analog signal is generated in a manner substantially insensitive to variations in the reference about which the analog signal oscillates by switching the digital equivalent between high and low levels based on reference voltages derived from the peaks and valleys of the analog signal. The manner of generating the digital equivalent is substantially insensitive to common mode noise across the analog signal generator by locking a differential signal output when significant common mode noise in sensed. Generator faults are also diagnosed.

REFERENCES:
patent: 3628059 (1971-12-01), Niu
patent: 3851259 (1974-11-01), Porawski
patent: 4939750 (1990-07-01), Nakamura
patent: 4975657 (1990-12-01), Eastmond
patent: 5146223 (1992-09-01), Muto

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