The invention belongs to the technical field of photoelectric receiving, particularly relates to a photoelectric
signal receiving method for realizing self-
adaptive switching of sampling resistance values. Aiming at the problem that a large optical
signal receiving range cannot be met, the following scheme is provided, namely, the method comprises the following steps of: S1, PMOS (P-channel
Metal Oxide Semiconductor) tubes M6 and M4 generate a mirror current; S2, a PMOS tube M5 stabilizes the
voltage of a VP node at a fixed value; S3, when the current of a photosensitive
diode is very small, the sampling resistance value is 100 * r0, and the current-to-
voltage amplification factor is 100; S4, when the current of the photosensitive
diode is increased, the node
voltage clamping value of the source end of an NMOS tube M1 is VS + Vt5 - Vt1, and the current-to-voltage
amplification factor is 10; and S5, when the current of the photosensitive
diode is increased again, the node voltage clamping value of the source end of the NMOS tube M2 is VS + Vt5 - Vt1 - Vt2, and the current-to-voltage
amplification factor is 1. According to the invention, good
signal receiving under strong
light irradiation and sensitive receiving of weak
infrared light signals can be realized, and the requirement of
large dynamic range of light signals received by a photosensitive diode is met.