Analog Devices Global Unlimited Company

Analog Devices International Unlimited Company

Jesus Bonache

Eamonn J Byrne

Jonathan Ephraim David Hurwitz

Andrejs Tunkels

Robert Sythes

Eamonn Byrne

It is often desirable to distinguish between an open circuit condition and a no signal condition. In both cases an input signal may be absent, but only one of these events represents a failure of the equipment. The present disclosure provides a way to use a difference amplifier to check for open circuit events, without requiring additional circuitry at the input of the amplifier.

Method of and apparatus for detecting open circuit conditions at an input to a signal chain and for detecting channel imbalance in a differential signal chain

Techniques are provided for compensating gain of a combined amplifier and analog-to-digital converter (ADC) circuit, for example, due to additional filtering added to an input of the circuit. In an example, an integrated circuit including an amplifier and ADC can include an amplifier circuit configured to receive an input signal and to amplify the input signal based on an input resistance and a feedback resistance, and to provide an amplified representation of the input signal, and an ADC circuit configured to receive an output of the amplifier, to determine a digital coefficient associated with an additional input resistance coupled to the amplifier, and to provide a compensated digital representation of the amplified representation of the input signal using the digital compensation coefficient.

ADC digital gain error compensation

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Valencia, Spain

Jesus Bonache