RC oscillator with capacitive tuning. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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Tuning an RC oscillator with a dual capacitor has advantages over tuning with dual variable resistors.
In such generators, the stability of the generated oscillations is higher, fine tuning to a given frequency is facilitated, and the temperature stability of the generated oscillations is increased. However, when using dual KPIs with a maximum capacitance of 500 pF, the amplifier operating in the generator must have a high input impedance.
The generator can be assembled using an op amp with a field effect transistor input circuit. The phase shift circuit is connected to the non-inverting input of the op-amp. The stabilization of the amplitude of the generated oscillations is carried out using the transistor V1. The signal from the output of the op-amp is rectified by diodes V2, V3 and fed to the gate of the field-effect transistor. When the oscillation amplitude changes, the drain-source resistance also changes, which leads to a change in the transfer coefficient of the op-amp. Thus, the oscillation amplitude at the output of the generator remains constant.
To ensure that the coefficient of non-linear distortion of the generated oscillations does not exceed 0,2%, the effective value of the signal voltage set by the resistor should not exceed 100 mV. Resistor R11 balances the op-amp. By increasing the capacitance of capacitors C8, C9 to 100 uF, the lower operating frequency can be reduced to 10 Hz.
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