Amplification circuit for laser distance measuring receiving system

Abstract

The invention relates to an amplification circuit for a laser distance measuring receiving system. A power supply VCC and a power supply VDD are respectively a positive power supply and a negative power supply for the work of an operation amplifier U1, the power supply VEE is connected with one end of a magnetic ball L1, the other end of the magnetic ball L1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with a cathode of a PIN tube D1, an anode of the PIN tube D1 is grounded, a capacitor C2 and a capacitor C3 are connected in parallel between the magnetic ball L1 and the PIN tube D1, the cathode of the PIN tube D1 is connected with one end of the capacitor C1, a resistor R2 is connected in series between the capacitor C1 and the reverse phase input end of the operation amplifier U1, the resistor R3 is connected in series between the reverse phase input end and the output end of the operation amplifier U1, one end of a resistor R4 is connected with the identical phase input end of the operation amplifier U1, and the other end of the resistor R4 is grounded. The amplification circuit is adopted for preventing the saturation phenomenon of the receiving PIN tube, and the normal work of the receiving circuit is ensured, so the function stability of the laser distance measuring system is improved.

Description

technical field [0001] The invention relates to an amplifying circuit, in particular to an amplifying circuit of a laser ranging receiving system. Background technique [0002] At present, laser ranging technology has been widely used in the field of automotive active safety. [0003] The laser ranging system mainly includes a transmitting part and a receiving part, such as figure 1 As shown, the receiving part usually includes PIN tube, amplifier, filter circuit and timing chip. Normally, the amount of charge flowing in the PIN tube is determined by the light intensity and the voltage difference between the two ends. In the case of sufficient sunlight, the PIN tube is often saturated, that is, the charge flowing through the PIN tube is no longer changing but a constant value, and the effective AC signal is submerged and cannot be extracted, resulting in the receiving part not working effectively. Affect the stability of system functions. Contents of the invention [0...

AI Technical Summary

Problems solved by technology

[0004] The present invention designs an amplifying circuit for a laser ranging receiving system. The technical problem it solves is that in the case of sufficient sunshine, the PIN tube is often saturated, and the effective AC signal is submerged and cannot be extracted, resulting in Part of it cannot work effectively, affecting the stability of system functions

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