Logarithmic analog-to-digital converter

Details Logarithmic analog-to-digital converter Logarithmic analog-to-digital converter

1980-04-15

1982-09-21

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, H03K 1302

Patent

active

043509746

ABSTRACT:
A logarithmic analog-to-digital converter which provides a digital representation of the logarithm of the ratio of an input voltage and a reference voltage. The converter determines the ouptut via a successive approximation technique. The input voltage is amplified by selected ones from among a plurality of exponentially related gains; and the reference voltage is attenuated by selected ones of a set of exponentially related attenuation factors. The amplified input signal and the attenuated reference signal are compared, and the results of this comparison for a series of attenuations and/or amplification factors produces the desired logarithmic representation.

REFERENCES:
patent: 3187323 (1965-06-01), Flood
patent: 3239833 (1966-03-01), Gray
patent: 3525948 (1970-08-01), Sherer
patent: 3533098 (1970-10-01), Munoz
patent: 3544993 (1970-12-01), Gabriel
patent: 3670326 (1972-06-01), Sloane
patent: 3742489 (1973-06-01), Lefevre
patent: 3997892 (1976-12-01), Susset

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