Oscillator circuit and current compensation circuit for oscillator

An oscillator circuit, comprising:

• a current generator, supplied by a supply voltage to output a supply current;
• an oscillator, having a supply node arranged to receive the supply current, the oscillator being arranged to generate an oscillating signal according to a driving current, wherein a first portion of the supply current flows into the oscillator from the supply node of the oscillator to serve as the driving current;
• and
• a current compensation circuit, coupled to the supply node of the oscillator, the current compensation circuit being configured to generate a first portion of a compensation current according to the supply voltage and a reference signal, and generate a second portion of the compensation current according to a first process-dependent current,
• wherein a signal level of the reference signal is independent of a variation in the supply voltage, and the first portion of the compensation current changes in response to the variation in the supply voltage;
• the current compensation circuit is arranged to draw the compensation current from the supply node of the oscillator to compensate for a variation in the supply current generated in response to the variation in the supply voltage.