Published:2012/10/17 23:03:00 Author:Ecco | Keyword: Voltage - controlled oscillator , operational amplifier | From:SeekIC
The circuit uses integrator A1 and delay comparator A2 to form a triangular wave oscillator, but the circuit is not directly integrating the output of A2, but it's controlled for integrating, therefore, the obtained oscillation frequency and control voltage are proportional, i.e. the so-called voltage-controlled oscillator. In the circuit, when VT2 gets conduction, the discharging slope rate of C1 is contrary to charging to generate a triangular wave. Saturation voltage of the op amp A2 affects Delay comparator threshold. Thus, the circuit is not suitable for high accuracy circuit. A3 is level-shifting circuit.
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