Title: Logarithmic analog-to-digital converter

Abstract: Method and apparatus for performing a logarithmic analog-to-digital conversion in which the logarithm of an input signal is determined via a successive approximation technique. In operation, a reference signal is multiplied by a series of exponentially related factors to produce a series of intermediate trial signals. The input and intermediate signals are compared and each intermediate signal which is smaller than the input signal becomes the new reference signal. The series of binary comparator output signals for each intermediate signal is the logarithm of that input signal.

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Inventors: Gordon, Bernard M. (Magnolia, MA, US)

Application Number: 836160
Filing Date: 1977-09-23
Publication_date: 1979-02-27
Assignee: Analogic Corporation (Wakefield, MA)
Primary Class(es): 341/138 341/165
Other Classes:
US Patent Ref:

3049701	Aug, 1962	Amdahl	340/347.
3065422	Nov, 1962	Villars	340/347.
3170153	Feb, 1965	Brooks	340/347.
3239833	Mar, 1966	Gray	340/347.
3264637	Aug, 1966	Parkinson	340/347.
3366949	Jan, 1968	Bruce	340/347.
3382438	May, 1968	Geller	325/38.
3513467	May, 1970	Sliwkowski	340/347.
3588881	Jun, 1971	Gordon	340/347.
3662347	May, 1972	Fox	340/347.
4048562	Sep, 1977	Haselwood	340/347.

Other Refs:
Primary Examiner: Miller, Charles D.
Assistant Examiner:
Attorney: Weingarten, Maxham & Schurgin