Analog signal input circuitry with an analog-to-digital converte

Details Analog signal input circuitry with an analog-to-digital converte Analog signal input circuitry with an analog-to-digital converte

1996-04-29

1997-12-16

Callahan, Timothy P.

Coded data generation or conversion

Converter compensation

341120, 327100, 327 94, H03M 100

Patent

active

056990634

ABSTRACT:
The analog signal input circuit comprises an analog-to-digital circuit and a conversion error measuring circuit. The conversion error measuring circuit comprises the following elements. A first switching device is provided between an analog signal input terminal and the sample/hold circuit for disconnecting the analog-to-digital circuit from the analog signal input terminal when measuring a conversion error value. A reference voltage generation circuit is connected via a second switching device between the first switching device and the sample/hold circuit. The correction reference voltage generation circuit generates a correction reference voltage in relation to the A/D conversion reference voltage. The second switching device is operated to connect the analog-to-digital circuit to the correction reference voltage generation circuit when measuring the conversion error value. A conversion error value memory is provided for storing a conversion error value defined as a difference between the correction reference voltage and the A/D conversion reference voltage.

REFERENCES:
patent: 5331321 (1994-07-01), Mannonen

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