Electric motor control chip and method

Details Electric motor control chip and method Electric motor control chip and method

1994-03-30

1996-12-03

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

318811, 341122, H03M 112

Patent

active

055812546

ABSTRACT:
A conversion circuit digitizes first and second differential analog signals conducted by first and second conductors for digital processing in a motor control system. The conversion circuit includes an analog-to-digital conversion circuit. The analog-to-digital conversion circuit includes a CDAC having a charge summing conductor connected to an input of a bit decision comparator and first and second simultaneously sampled differential sample and hold MSB circuits connected to the charge summing conductor. The first and second differential analog signals are simultaneously sampled and held in the first and second differential sample and hold MSB circuits, respectively, and then are sequentially converted to digital numbers by the analog-to-digital conversion circuit. The first and second analog signals are processed as differential signals all the way from the analog input of the conversion circuit to inputs of a bit decision comparator in the analog-to-digital conversion circuit, and thereby maintain a high level of common mode noise rejection. Programmable reference voltage levels are supplied to the analog-to-digital conversion circuit to accommodate a wide range of amplitudes of the first and second differential analog signals.

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