Successive approximation type A/D converter

Details Successive approximation type A/D converter Successive approximation type A/D converter

2007-09-04

2007-09-04

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000, C341S118000

Reexamination Certificate

active

11407083

ABSTRACT:
An A/D converter of an successive approximation type according to the present invention comprises a sample hold circuit, a reference voltage generating circuit, a comparator for comparing the reference voltage generated by the reference voltage generating circuit to a value of the input analog signal retained in the sample hold circuit, a control circuit for successively controlling the reference voltage generating circuit so that a value of the reference voltage approximates to the value of the input analog signal retained in the sample hold circuit, a buffering circuit for outputting an output value corresponding to an output voltage of the comparator, a latch circuit for retaining the output value of the buffering circuit corresponding to the output value of the comparator per bit as a digital value, and a buffering control circuit for blocking a power supply to the buffering circuit during the sampling period is provided.

REFERENCES:
patent: 4107671 (1978-08-01), Huntington et al.
patent: 5877719 (1999-03-01), Matsui et al.
patent: 6054945 (2000-04-01), Doyle
patent: 6060914 (2000-05-01), Nunokawa
patent: 6433727 (2002-08-01), Yoshinaga
patent: 6867723 (2005-03-01), Tachibana et al.
patent: 7-193503 (1995-07-01), None

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