ADC input circuit sensing for fault detection

Abstract

The invention relates to an ADC input circuit sensing for fault detection. A fault detection scheme can include use of a relatively high injection impedance between an input port for analog measurements from a sensor and a stimulus generation circuit controlled in coordination with analog measurement. The stimulus generation circuit can provide a stimulus signal through the injection impedance. Amagnitude of the injection impedance can be specified relative to a source impedance associated with a source (e.g., a sensor or other device) coupled to the input port. For example, a magnitude of the injection impedance can be specified to be larger than the source impedance or the injection impedance magnitude can be specified to be a multiple of the source impedance.

Description

[0001] claim priority [0002] This patent application claims priority benefit to U.S. Provisional Patent Application Serial No. 62 / 480,376 (Attorney Docket No. 3867.410PRV), filed April 1, 2017, by Brychta et al., entitled "ADC INPUT CIRCUITSENSING FOR FAULT DETECTION," hereby Its entire contents are incorporated herein by reference. technical field [0003] This document relates generally, but not limitedly, to analog measurement circuits such as comprising analog-to-digital conversion (ADC) circuits, and more particularly to ADC-to-ADC circuit inputs with coupled further circuits such as frequency divider circuits. Background technique [0004] Electronic circuitry for performing analog signal measurements may include analog measurement circuitry, for example in combination with analog-to-digital conversion (ADC) circuitry. Such electronic circuits are typically implemented using semiconductor processing and associated circuit configurations that support a relatively lim...

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Problems solved by technology

The effective input voltage may not be distinguishable from the analog measurement circuit

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