Title: Bipolar A/D converter using two comparators

Abstract: Elimination of an inverting amplifier and a video switch, which provide selective polarity reversal to permit usage of unipolar A/D conversion in prior art bipolar A/D converters, for improved economy and performance, is achieved by usage of two comparators, one for comparing positive input signals and one for comparing negative input signals, the output of one of the comparators, at any one time, providing the input to unipolar A/D converter successive approximation logic, and establishing the sign of the result.

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Inventors: Waehner, Glenn C. (Riverside, CT, US)

Application Number: 507647
Filing Date: 1974-09-19
Publication_date: 1976-09-21
Assignee: United Technologies Corporation (Hartford, CT)
Primary Class(es): 341/127 324/99D, 341/158
Other Classes:
US Patent Ref:

3505668	Apr, 1970	Ottesen	340/347.
3544993	Dec, 1970	Gabriel	340/347.
3657653	Apr, 1972	Wilkinson	340/347.
3718923	Feb, 1973	Horwitz et al.	340/347.

Other Refs:
Primary Examiner: Sloyan, Thomas J.
Assistant Examiner:
Attorney: Williams; M. P.