Analog Dialogue Volume 45, Number 1

Analog Dialogue Volume 45, Number 1 is now available from Smashwords.

Analog Dialogue Volume 45, Number 1

Analog Dialogue Volume 45, Number 1 is now available from the Kindle store.

Data Conversion Knowledge Resource

Explore technical fundamentals and design considerations for data conversion functions. Select signal chain topics to access relevant educational material.

High-Resolution Temperature Measurement

The AD8494 thermocouple amplifier includes a temperature sensor, normally used for cold-junction compensation. Grounding the thermocouple inputs allows it to be used as a standalone Celsius thermometer. In this configuration, the in-amp produces a 5-mV/°C voltage between its output and reference pins. This article suggests two ways that this output voltage can be offset and scaled to facilitate high-resolution temperature measurement.

Simple Op Amp Measurements

When testing op amps, their high open-loop gain makes it hard to avoid small voltage errors due to pick-up, stray currents, or the Seebeck effect. The measurement process can be simplified by using a servo loop to force a null at the input, thus allowing the amplifier to measure its own errors. This article describes a versatile circuit that employs an auxiliary op amp as an integrator to establish a stable loop with very high dc open-loop gain.

A Foolish Question about Op Amps and Capacitors

Can you help with the strange interaction between the op amp and capacitors in my circuit? This sounded more like a Frequently Asked Question than a Rarely Asked Question, but turned out to be neither...

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