Darren O'Connor is a senior system EE with SPEC Inc., Bouler, Colo. He received an MSEE from the University of Colorado, Boulder, and a BSEET from the Oregon Institute of Technology, Klamath Falls. Email address: darren@specinc.com
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September 15, 2005[Ideas For Design] Servo Circuit Controls Sine-Wave Amplitude
The figure shows a schematic for an oscillator amplitude-control servo system. The circuit creates a closed-loop system that supplies a fixed and adjustable peak-to-peak amplitude ac signal centered around 0 V. A 1-kHz sine wave, labeled AC_INPUT, is ac-coupled to an AD633 multiplier chip. Then the AC_INPUT is multiplied by the SERVO signal. The multiplier's output is a scaled version of the AC_INPUT. This 1-V sine output signal is fed into a peak detector, and the peak of the...
