Structure and method for performing analog to digital conversion

Details Structure and method for performing analog to digital conversion Structure and method for performing analog to digital conversion

1994-09-02

1996-03-26

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

H03M 160

Patent

active

055024408

ABSTRACT:
A structure and method of performing an analog-to-digital conversion uses a voltage generator which generates an analog reference signal in response to a clock signal. The analog reference signal is a ramp signal which varies between two on-chip supply voltages. A voltage divider circuit receives an analog input signal to be digitized and the analog reference signal. The voltage divider circuit creates an analog control signal equal to the sum of a predetermined fraction of the analog input signal and a predetermined fraction of the analog reference signal. The analog control signal is provided to a first digital buffer and the analog reference signal is provided to a second digital buffer. The first and second digital buffers provide digital control signals having a first logic state when the applied input signal is less than a threshold voltage and having a second logic state when the applied input signal is greater than the threshold voltage. A digital logic circuit receives the digital control signals from the first and second digital buffers and the above-mentioned clock signal. In response, the digital logic circuit generates a digital output signal representative of the analog input signal.

REFERENCES:
patent: 3997892 (1976-12-01), Susset
Kevin Daugherty, "Microcontroller-Based Design Uses Minimal Support ICs and Code to Get High-Accuracy Analog-To-Digital Conversion-Try Single-Slope A-D Conversion for a Low-Cost 12-Bit Solution", p. 59-Electronic Design, Jan. 23, 1992.

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