Device of measuring duty cycle and compensation circuit utilizing the same

A compensation circuit comprising:

• a resistor-capacitor circuit configured to generate a first voltage when a reference signal is in a first state, and generate a second voltage and a third voltage when the reference signal is in a second state, the resistor-capacitor circuit comprising:
• a first resistor circuit comprising a first terminal configured to receive the reference voltage, and a second terminal;
• a second resistor circuit comprising a first terminal, and a second terminal coupled to a ground terminal and configured to selectively provide a first resistance or a second resistance;
• and
• a storage capacitor circuit comprising a first terminal selectively coupled to the second terminal of the first resistor circuit or the first terminal of the second resistor circuit, and a second terminal coupled to the ground terminal;
• and
• a control circuit coupled to the resistor-capacitor circuit, and configured to acquire an ON time of a front end module according to the first voltage, the second voltage, and the third voltage, and comprising an adjustment circuit configured to generate a bias signal according to the ON time, and output the bias signal to the front end module;
• wherein in a first period, the second resistor circuit provides the first resistance, and after the first period has elapsed, the first terminal of the storage capacitor circuit generates the second voltage;
• in a second period, the second resistor circuit provides the second resistance, and after the second period has elapsed, the first terminal of the storage capacitor circuit generates the third voltage;
• and
• the first resistor circuit is configured to charge the storage capacitor circuit, and the second resistor circuit is configured to discharge the storage capacitor circuit.

A compensation circuit comprising:

• a resistor-capacitor circuit configured to generate a first voltage when a reference signal is in a first state, and generate a second voltage and a third voltage when the reference signal is in a second state;
• and
• a control circuit coupled to the resistor-capacitor circuit, and configured to acquire an ON time of a front end module according to the first voltage, the second voltage, and the third voltage, and comprising:
• an adjustment circuit configured to adjust an input impedance and/or output impedance of the front end module according to the ON time, generate a bias signal according to the ON time, and output the bias signal to the front end module, the adjustment circuit comprising:
• a bias current source configured to generate a first bias current and a second bias current;
• and
• a switch coupled to the bias current source and configured to provide the bias signal based on the first bias current and the second bias current.