Abstract
A sinusoidal oscillator is considered of which both the frequency and amplitude are electronically controlled. The control of frequency is obtained with two multipliers used as controlled amplifiers. The circuit for amplitude control also uses multipliers; the output voltages of the oscillator are squared and summed and the resulting DC voltage is compared with the reference. This approach provides fast frequency and amplitude control. The practical range of frequency control depends on the distortion level requirements. A detailed consideration of non-linear distortion is given. The main sources of the distortion are the non-linearity and mismatch of the multipliers and the offset of operational amplifiers in the oscillation loop. The frequency can be controlled in the range 16 Hz–16 kHz (in three overlapping bands) with a level of distortion that varies between − 40 dB and − 55 dB.
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