PROXIMITY SENSOR RECEIVING ANALOG FRONT-END CIRCUIT AND PROXIMITY SENSOR

摘要

Provided are a proximity sensor receiving analog front-end circuit and a proximity sensor. The front-end circuit comprises: a photosensitive diode (15), a current integration module (14), a reverse amplification module (12), a reset module (13), and an offset module (11). A first end of the offset module (11) is connected to a power supply end. A second end of the offset module (11) is connected to the first end of the photosensitive diode (15) and the current integration module (14), and an output end of the reset module (13), respectively. A third end of the offset module (11) is connected to the first end of the reverse amplification module (12). The second end of the reverse amplification module (12) is connected to the second end of the current integration module (14), and a first input end of the reset module (13), respectively. A reference voltage is input into a second input end of the reset module (13). A voltage at the first input end of the reset module (13) is equal to the voltage at the second input end of the reset module (13), and the reset module (13) and the current integration module (14) constitute a unit gain amplification unit. The front-end circuit and the proximity sensor can solve the problems in the prior art of large chip area and large noise.