Oscillator circuit has decoder and control unit that compares tuning voltage at input with boundary values and acts on oscillator to vary frequency if upper or lower boundary crossed

摘要

The circuit has a voltage controlled oscillator or VCO that produces an oscillator signal (OS) with an oscillator frequency at an output depending on a tuning voltage (UA) and that has a tunable frequency range, a decoder and control unit (DS) that compares the tuning voltage delivered at the input with boundary values (MAX,MIN) and acts on the oscillator to vary the frequency if the upper or lower boundary is crossed.