Quadrature relaxation oscillator using frequency error compensation loop

A quadrature relaxation oscillator using a frequency error compensation loop, comprising:

• a charge control unit configured to provide a charge path or a discharge path for generating an I clock signal and a Q clock signal at a corresponding phase among first to fourth phases;
• a charge unit configured to charge a power supply voltage supplied through the charge path or discharge a previously-charged voltage through the discharge path, and output corresponding first and second charge/discharge voltages;
• a reference voltage generation unit configured to output first and second upper reference voltages and first and second lower reference voltages by applying a frequency compensation method, wherein the reference voltage generation unit compares the first and second charge/discharge voltages with upper and lower reference voltages, respectively, at phases at which levels of the first and second charge/discharge voltages are stopped, and outputs the first and second upper reference voltages and the first and second lower reference voltages which are synchronized with the first and second charge/discharge voltages;
• a comparison unit configured to compare the first charge/discharge voltage with the first upper and lower reference voltages and compare the second charge/discharge voltage with the second upper and lower reference voltages, and output corresponding respective logic signals;
• and
• an S-R latch unit configured to latch the respective logic signals and output the I clock signal and the Q clock signal corresponding thereto.