Fast analogue-to-digital converter

Details Fast analogue-to-digital converter Fast analogue-to-digital converter

2008-07-01

2008-07-01

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000, C341S154000, C341S156000

Reexamination Certificate

active

07394421

ABSTRACT:
The invention relates to fast analogue-to-digital converters having differential inputs and a parallel structure, comprising at least one network of N series resistors with value r and one network of N comparators. The series resistor network receives a reference voltage and is traversed by a fixed current Ioand the row i (i varying from 1 to N) comparator essentially comprises a dual differential amplifier with four inputs; two inputs receive a differential voltage VS−VN to be converted, a third being connected to a row i resistor of the network, and a fourth input being connected to an N-i row resistor of the network. The resistor network is supplied by a variable reference voltage originating from a servoloop circuit which locks the voltage level of the middle of the resistor network at a voltage equal to the common mode voltage (VS−VSN)/2 present at the output of the sample-and-hold module.

REFERENCES:
patent: 5012241 (1991-04-01), Kuttner
patent: 5396131 (1995-03-01), Miki et al.
patent: 5539406 (1996-07-01), Kouno et al.
patent: 6603416 (2003-08-01), Masenas et al.
patent: 2003/0201928 (2003-10-01), McGowan
patent: 38 07 329 (1989-09-01), None

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