Detection circuit and power management system including the same

A detection circuit, comprising:

• a threshold voltage generation circuit for generating a threshold voltage;
• a voltage-to-current conversion circuit for converting an offset voltage of a signal to be detected with respect to the threshold voltage into a proportional current;
• a current-type successive approximation quantizer which is used to obtain a detection result by quantizing the proportional current;
• and
• a differential sampling switch configured to provide the voltage-to-current conversion circuit with an offset voltage or a reference ground,
• wherein the voltage-to-current conversion circuit comprises:
• a storage capacitor, with a first end being coupled with an output of the threshold voltage generation circuit and an input terminal for receiving the signal to be detected;
• a first transistor having a control terminal being coupled with a second end of the storage capacitor;
• a first resistor having a first end being coupled with a second terminal of the first transistor, and a second end being coupled to the offset voltage or the reference ground via the differential sampling switch;
• and
• a second transistor having a control terminal for receiving a bias voltage, a second terminal being coupled with the first terminal of the first transistor, and a first terminal for outputting the proportional current.