When I originally wrote the treatise on dynamic circuit response from which this series is derived, I had a different version of this fifth article in the series, “Open-Circuit or Nodal Time Constants ...

What is the time constant? In a 555 timer circuit, the time period for which the output remains high or low is influenced by two key components: capacitance (C) and resistance (R).

Instead of using a monolithic DPGA, you can use two op amps and three analog switches to build a DPGA employing negative time constants. You’re no doubt familiar with the e –t/RC convergent ...