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Fast amplitude control in twin-T bridge RC oscillators

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2 Author(s)
Filanovsky, I.M. ; University of Alberta, Department of Electrical Engineering, Edmonton, Canada ; Fortier, G.J.

When a sinusoidal voltage is applied to the symmetrical twin-T bridge, the voltages at the inner nodes of the bridge have equal amplitudes and are shifted by 90°. If they are squared and summed, the resulting DC voltage can be used to control the gate of a field-effect transistor connected to the bridge. The oscillator with such a control system simultaneously has low distortion and fast amplitude transient response.

Published in:

Electronics Letters  (Volume:21 ,  Issue: 18 )