### RMS to dc Circuit

**Circuit measures true-rms and average value**

The circuit measures both the true-rms value and the

rectified average value of an ac signal.This design uses

two low-cost ICs

Operating from a single 5V supply, the circuit has an

input dynamic range of less than 30 mV to greater than 3V rms.

**RMS-to-dc converter Circuit is accurate and stable**

The circuit uses a low-cost analog multiplier, IC1; an

integrator, IC3A, R5, and C1; and an analog inverter, IC2, R3, R4,

and D1 to convert the analog VIN into a true-rms dc VOUT.

The input signal can be ac, dc, or a combination. With an

input-signal range of 0 to 2V, the circuit can handle ac signals

with crest factors up to 5

**True RMS Detector Circuit**

The op amp precision rectifier circuits have greatly eased

The problems of AC to DC conversion. It is possible to measure

millivolt AC signal with a DC meter with better than 1%

accuracy. Inaccuracy due to diode turn-on and nonlinearity is

eliminated, and precise rectification of low level signals isobtained

**Extend RMS-To-DC Converter's Range**

The AD736 rms-to-dc converter is a 1-V, full-scale device.

Voltage comparator IC3 can increase the full-scale input range to

10 V automatically. When the rms-to-dc operating range is exceeded

, the comparator's hysteresis switches in an attenuator at the

rms-to-dc converter's input. Concurrently, it adds a gain stage to

the circuit's output-buffer amplifier, maintaining a steady output

voltage.

Labels: RMS