Analog-to-digital converter using scaled signal to initialize co

Details Analog-to-digital converter using scaled signal to initialize co Analog-to-digital converter using scaled signal to initialize co

1995-09-22

1997-11-18

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341158, H03M 114

Patent

active

056892608

ABSTRACT:
An analog-to-digital converter includes a coarse conversion circuit, a fine conversion circuit, a scaling circuit, and a logic circuit. An analog input signal is applied to the scaling circuit which provides a scaled signal. The scaled signal is applied to the fine conversion circuit which provides a digital control signal. The digital control signal is applied to the coarse conversion circuit for initializing the coarse conversion circuit. Thereafter, the analog input signal is applied to the initialized coarse conversion circuit which provides a first digital code and a reference signal associated with the first digital code. A remainder signal is determined at least in part by the difference between the analog input signal and the reference signal. The remainder signal is applied to the fine conversion circuit which provides a second digital code. The logic circuit determines a digital output signal, representing the analog input signal, in response to at least the first and second digital codes.

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D.W.J. Groeneveld et al.,"A Self-Calibration Technique for Monolithic High-Resolution D/A Converters", IEEE Journal of Solid-State Circuits, vol. 24, No. 6, Dec. 1989, pp. 1517-1522.
D.G. Vallancourt, "The Making of Animal 2" Internal AT&t Memoradum, Apr. 18, 1995, Describes a prior art current-mode A/D converter.

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