Edge triggered sample and hold circuit and circuits constructed

Details Edge triggered sample and hold circuit and circuits constructed Edge triggered sample and hold circuit and circuits constructed

1995-03-24

1997-03-04

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341122, H03M 144

Patent

active

056084021

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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