Circuit measures true rms and average
value: 09/26/2002 EDN -
Design Ideas / The circuit in Figure 1 measures both
the true-rms value and the rectified average value
of an ac signal. This design uses two low-cost ICs
in SOIC packages and consumes only 180 µA of
quiescent current. Operating from a single 5V
supply, the circuit has an input dynamic range of
less than 30 mV to greater than 3V rms..
Extend RMS-To-DC Converter's Range:
09/05/00 Electronic Design - Ideas for Design / This
Idea For Design was originally published July 12,
1990. Comparator hysteresis can extend the dynamic
range of ac signal measurement by auto ranging an
rms-to-dc converter. A. . .
Linear-RMS Phase Control Improves
03/05/01 Electronic Design - Ideas for Design /
Precision temperature control circuits for small
thermal loads like oscillator crystals and voltage
references tend to be fairly easy to design. This is
because simple, well-behaved, linear-output drivers
running from regulated dc supplies are often. . .