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Wien_bridge_sine_wave_oscillator

2016-05-18 10:16  
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Wien_bridge_sine_wave_oscillator
This circuit differs from other Wien-bridge oscillators described in this chapter only in the form of negative-feedback stabilization. Negative peaks in excess of -8.5 V cause D1 and D2 to conduct, which charges C4. The C4 charge biases Q1, which determines amplifier gain. C3 provides low-frequency roll-off in the feedback network, and prevents offset voltage/current errors from being multiplied. R5 is chosen to adjust the negative feedback loop so that Q1 is operated at a small negative gate bias. National Semiconductors, Linear Applications Handbook, 1991, p. 28.