As the younger brother of Mick, Chris Jagger the engineer used to go around saying "I can't get no Interaction", he was probably referring to the 2D static signal chain diagrams that have resided on analog.com for years.  ...
In the last blog post, I discussed electrode models and the challenges of managing dry electrodes. Building off this information, let’s shift to the topic of electrode or lead (pair of electrodes) off detection and how this feature can im...
In the last blog post, I talked about the difference between two and three electrode solutions when biasing the measurement inputs and managing CMRR performance. Now I’d like to focus a bit more on the electrodes themselves. O...
In the last blog post we showed a DC coupled biopotential configuration using the AD4130-8 and referenced a third electrode used to bias the body to midsupply. We mentioned this was not a true Right Leg Drive (RLD) and that this may be acceptab...
For more than five decades, Analog Devices has led the electronics industry in the development of analog building blocks for precision signal chains. A recurrent theme which has emerged more strongly in each successive decade has been the demand for ...
Now that we gave an AC coupled example (AD8233) in our previous blog post, the recent release of the AD4130-8 is a great opportunity to discuss a DC coupled input signal chain. If you recall in the second blog, we mentioned that DC coupled sign...
A common requirement when capturing signals from sensors such as Electro Magnetic Flow Meters (EM Flow) in Field transmitters or electrodes in biopotential applications, the signal of interest is usually sitting on much larger dc offsets. To make it ...
In last month's blog post we discussed the tradeoffs between AC and DC coupled signal chains when measuring small signals in the presence of much larger DC offsets and low frequency interferers. We also showed that the location of the high-...
In last month's blog post we started to discuss the many interferers associated with making biopotential measurements. Since these interferers can have much higher amplitudes than the signal of interest and overlap with the signal frequency...
In this new precision low power blog series, we will take a deep dive into the challenges of making biopotential measurements. We will also address some of the common topics that frequently come up, such as:
Designing a precision low power signal ch...
Want to understand the electrical and physical properties of a Resistance Temperature Detector (RTD) sensor?
Check out this latest KWIK (Knowledge with integrated know-how) FAQ from Michael Jackson. Here you will see a step by step guide where M...
Take a look at the latest KWIK circuit FAQ from Tim Green. Here Tim takes you through a step by step guide on how to address the design challenges associated with full bridge strain gauge sensors. The details captured in the KWIK circuit FAQ not only...
When designing a solution that can be configured for many different measurements, a thought that usually comes to mind is, how can this specific block be reused, does it make sense, and what are the things that need to be considered.
Let's for a...
An instrumentation amplifier (In-Amp) is a device that amplifies the difference between its two input terminals while rejecting common-mode signals and produces an output voltage with respect to a reference terminal. In-Amps provide the importa...
