Digitally controllable oscillator with high accuracy

An oscillator, comprising:

• a controlled oscillator configured to generate an output signal based on an oscillator input signal;
• a frequency divider configured to divide a frequency of the output signal to generate a frequency divided feedback signal;
• a phase detector configured to generate an error signal based upon the frequency divided feedback signal and an input signal;
• a loop filter configured to low-pass filter the error signal to generate a filtered error signal;
• and
• an error signal pulse train modulator configured to generate the oscillator input signal by being configured to perform a pulse train modulation of the filtered error signal or a signal derived from the filtered error signal based on the input signal, wherein the oscillator input signal comprises a number x of pulses separated by a number (N−x) of gaps within a period of the input signal, wherein N is a number of time slots for pulses and gaps within the period of the input signal, wherein the number x of pulses is proportional to the error signal or the signal derived from the error signal, and wherein the output signal is phase locked to the input signal.