Compensation module, oscillation circuit, and associated compensation method capable of reducing sensitivity of output oscillation signal

An oscillation circuit, comprising:

• a voltage-controlled oscillator (VCO) core, coupled to a regulator, configured to receive a periodic regulated signal from the regulator and generate an output oscillation signal;
• a compensation circuit, coupled to the VCO core and the regulator, comprising:
• a first receiving terminal;
• and
• a second receiving terminal, wherein the compensation circuit has a capacitance value related to voltages of the first receiving terminal and the second receiving terminal;
• and
• a polarity selection circuit, coupled to the regulator and the compensation circuit, configured to receive the periodic regulated signal and a filtered bias signal, wherein the polarity selection circuit conducts the periodic regulated signal to one of the first receiving terminal and the second receiving terminal and conducts the filtered bias signal to the other of the first receiving terminal and the second receiving terminal.

A compensation method applied to an oscillation circuit comprising a VCO core, a compensation module comprising a first receiving terminal and a second receiving terminal, and a calibration circuit, wherein the compensation method comprises steps of:

• receiving a periodic regulated signal by the VCO core and the compensation circuit from the regulator, wherein the periodic regulated signal is received at one of the first receiving terminal and the second receiving terminal;
• receiving a filtered bias signal by the compensation module, wherein the filtered bias signal is received at the other of the first receiving terminal and the second receiving terminal, and wherein the capacitance value is related to voltages of the first receiving terminal and the second receiving terminal;
• and
• performing a calibration procedure by the calibration circuit to generate a polarity setting signal and a compensation setting signal, wherein the calibration circuit changes the voltages of the first receiving terminal and the second receiving terminal with the polarity setting signal and the compensation setting signal.