Nonlinear analog to digital converter having first and second co

Details Nonlinear analog to digital converter having first and second co Nonlinear analog to digital converter having first and second co

1992-05-13

1995-03-28

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

341155, 341131, H03M 112, H03M 120

Patent

active

054021251

ABSTRACT:
An Operational Analog to Digital (SYMAD) Convertor cell for converting an analog signal into a discrete binary code. An analog signal is processed by sample and hold circuitry and then compared to a reference voltage by a comparator. The comparator output is the converted digital output. This output is coupled back to the control input of an analog switch which selects either the reference voltage or a predetermined potential, typically zero volts, to couple to an inverting input of an operational amplifier. The analog signal input is also coupled to the non-inverting input of the operational amplifier. The operational amplifier is configured as a differential amplifier with a gain of two. If the digital output of the comparator is a logic 1, then the operational amplifier output is two times the difference between the analog signal and the reference voltage. If the digital output of the comparator is a logic 0, then the output of the operational amplifier is two times the analog signal. As many SYMAD cells as necessary may be provided to obtain a desired resolution.

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