SENSITIVE WIDEBAND LINEAR AC-DC CONVERTER

A theoretical and experimental study of a simple but effective linear a. c. -d. c. converter circuit is presented. A fullscale sensitivity, without preamplification, of 200 mv rms has been achieved with an absolute accuracy of within approximately plus or minus 3%. However, after calibration, the circuit can maintain an accuracy of within 1% over the temperature range 10-50 degree C. The frequency response is flat to within 0. 2 db from 20 Hz to 10 MHz and to within 3 db from below 10 Hz to approximately 80 MHz.