Balanced A/D converter

Details Balanced A/D converter Balanced A/D converter

1991-03-19

1992-06-09

Pellinen, A. D.

Coded data generation or conversion

Converter compensation

358174, H03M 106

Patent

active

051211173

ABSTRACT:
A balanced A/D converter system for a video signal. A clamp reference, corresponding to synchronizing pulse magnitude, is developed. The output of an A/D converter is summed with the clamp reference to develop a first correction signal for offsetting the video signal to the synchronizing pulse back porch level at the input of the A/D converter. A peak video reference signal is developed and summed with the output of the A/D converter to develop a second correction signal for controlling the gain of a variable gain amplifier coupled to the input of the A/D converter. Offsetting the video signal to the back porch level and amplifying the video signal based upon its maximum level enables the full utilization of the total range of the A/D converter.

REFERENCES:
patent: 4434439 (1984-02-01), Steckler et al.
patent: 4590458 (1986-05-01), Evans et al.
patent: 4625240 (1986-11-01), Yablonski et al.
patent: 4831378 (1989-05-01), Baars et al.
patent: 4837625 (1989-06-01), Douziech et al.
patent: 4908621 (1990-03-01), Polonio et al.
patent: 4970594 (1990-11-01), Kitaura et al.

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