Method and system for analog-to-digital signal conversion with s

Details Method and system for analog-to-digital signal conversion with s Method and system for analog-to-digital signal conversion with s

1997-04-03

1998-06-02

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

H03M 138

Patent

active

057607303

ABSTRACT:
A circuit is provided to carry out conversion and an analog signal into a digital signal, simultaneously with compression of the analog signal. An input analog signal buffered by a sample-and-hold circuit is supplied to a chain of amplifier stages having equal gains greater than 1. A set of comparators compares the output signal of each amplifier stage with a reference value. As soon as the output of any amplifier stage exceeds the reference value, an output of the corresponding comparator becomes active indicating the number of amplifier stages that were required to make the input signal higher than the reference value. A digital output device uses the comparator output signals to produce a digital signal proportional to the input signal level. As the amplifier chain is arranged so as to increase its total gain for a lower level of the input analog signal with respect to its total gain for a higher level of the input analog signal, the conversion circuit compresses the input analog signal simultaneously with its conversion into the digital signal.

REFERENCES:
patent: 3842413 (1974-10-01), Lagarde
patent: 5023490 (1991-06-01), Gittinger

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