Dual resolution circuitry for an analog-to-digital converter

Details Dual resolution circuitry for an analog-to-digital converter Dual resolution circuitry for an analog-to-digital converter

1996-09-24

1998-06-09

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341156, 327 52, H03M 138

Patent

active

057641757

ABSTRACT:
Circuitry is provided for use in a successive approximation analog-to-digital converter that protects the transistors in a high-resolution input stage from voltage threshold changes due to exposure to large input signals, while allowing a low-resolution input stage to process the large input signals. An input protection transistor allows the high-resolution input stage to be placed in either a differential amplifier configuration or a source follower pair configuration. An input circuit is also provided for a successive approximation analog-to-digital converter having high-resolution and low-resolution input stage circuitry. Protection circuitry within the input circuit ensures that the high-resolution input stage circuitry is not adversely affected by exposure to large input signals.

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