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STABILIZED_WIEN_BRIDGE_OSCILLATOR

2016-05-18 06:42  
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STABILIZED_WIEN_BRIDGE_OSCILLATOR
In this application, the AD534 is used as a vari-able-gain amplifier for the feedback signal from the output to the Y input, via the Wien bridge. The peak-rectifter and filter combination applies sufficient voltage to the X (denominator) input to maintain a stable oscillation-amplitude (with about 0.2% ripple). At startup, because X is small (divider mode), the gain is high, and the oscillation builds up rapidly. This is but one of several possible schemes, involving no extemal active elerrtents. Its forte is simplicity, rather than high performance; nevertheless, the amplitude is not greatly affected by supply and temperature variations, about 0.003 dB per volt, and 0.005 dB per degree.