Method and apparatus for converting analog signals into pulse si

Details Method and apparatus for converting analog signals into pulse si Method and apparatus for converting analog signals into pulse si

1997-04-03

1999-04-13

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341157, H03M 138

Patent

active

058942831

ABSTRACT:
A circuit is provided to convert an analog signal into a pulse signal, and simultaneously compress the analog signal. The 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, a logical summing device coupled to the comparators causes a pulse signal produced by the conversion circuit to become active. A clock signal controls the sample-and-hold circuit to produce a zero level sample-and-hold signal that causes the pulse signal to become inactive. 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 pulse signal.

REFERENCES:
patent: 3729732 (1973-04-01), Yano
patent: 3742489 (1973-06-01), Lefevre et al.
patent: 3842413 (1974-10-01), Lagarde
patent: 4091380 (1978-05-01), Yu
patent: 4594578 (1986-06-01), Walsh
patent: 4617549 (1986-10-01), Reiner
patent: 5023490 (1991-06-01), Gittinger

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