Active clamp photoelectric sensing device

An active clamp photoelectric sensing device, comprising:

• an input terminal, for receiving an input current;
• a first output terminal, for outputting a first output voltage;
• a current-to-voltage conversion circuit, coupled between the input terminal and the first output terminal, used to discharge and lower potentials of the input terminal and the first output terminal to a first set voltage according to a state of a reset signal, or used to gradually increase the first output voltage to a second set voltage;
• and
• an active clamp circuit, coupled to the current-to-voltage conversion circuit, used to clamp an upper limit of the first output voltage to the second set voltage,
• wherein the current-to-voltage conversion circuit further comprises:
• a first operational amplifier, having a first inverting input terminal, a first non-inverting input terminal, and a first amplifying output terminal, wherein the first inverting input terminal is coupled to the input terminal, the first non-inverting input terminal is coupled to the first set voltage, and the first amplifying output terminal is coupled to the first output terminal;
• a first switch, coupled between the first inverting input terminal and the first amplifying output terminal, turned on or turned off according to the state of the reset signal;
• and
• a first capacitor, coupled between the first inverting input terminal and the first amplifying output terminal;
• wherein when the state of the reset signal is at a high voltage level, the first switch is turned on, and the potentials of the input terminal and the first output terminal are discharged and lowered to the first set voltage;
• and
• wherein when the state of the reset signal is at a low voltage level, the first switch is turned off, and the first output voltage is gradually increased to the second set voltage.