Phase-locked control circuit, oscillator and signal processor

摘要

A phase-locked control circuit (PLL circuit) is disclosed, which has a voltage-controlled oscillator, which forms a phase-locked control loop and which has an amplifier which outputs a phase change signal having a phase function with regard to specific frequencies, a composition device having a first input, which receives an error signal (phase comparison signal) from a phase comparator via a low-pass filter, and a second input, in order to compose the signals at the first and second input for the purpose of outputting a composed signal, and also a phase and amplitude change device, which changes the phase and amplitude of the composed signal in response to the error signal, in order to supply a phase and amplitude change signal to the second input of the composition device, the composed signal acting as an oscillation signal of the voltage-controlled oscillator, as a result of which the PLL circuit has only slight fluctuations in the freewheeling frequency and has a broad locking range.