Ambient Light Compensation Circuit for Infrared Receiver

A technology of infrared receiving and compensating circuits, which is applied in the direction of adjusting electrical variables, without intermediate conversion to AC conversion equipment, instruments, etc., and can solve the problem that the receiving device cannot apply a linear amplification system.

CN113629997BActive Publication Date: 2022-04-08WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-04-08

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Abstract

The invention relates to an ambient light compensation circuit for an infrared receiving device, comprising a potential detection unit, a voltage integration unit and a voltage-current conversion unit connected in sequence, wherein the potential detection unit is used to receive a first voltage signal (VSAM) , and compare the first voltage signal (VSAM) with the reference voltage; the voltage integration unit includes a first switch (SW1) for controlling the charging of the capacitor and a second switch (SW2) for controlling the discharging of the capacitor, according to the output of the potential detection unit The signal controls the first switch (SW1) and the second switch (SW2), so as to charge or discharge the capacitor to output a second voltage signal (VX), and the voltage-current conversion unit is used to convert the second voltage signal ( VX) is converted to output compensation current. The invention can realize ambient light current compensation and realize stable gain.
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Description

technical field

[0001] The invention relates to an ambient light compensation circuit for an infrared receiving device. Background technique

[0002] Such as figure 1 As shown, the circuit structure of the traditional infrared receiving device includes: photosensitive tube D1, load resistors R1, R2...RN, bypass tubes N1, N2...NN, voltage source VDD, internal reference source VS, and output terminal VOUT.

[0003] The working process of this structure is: the photosensitive tube D1 receives the infrared signal, and generates the infrared receiving current I=ISIG+IF (ISIG is the signal current, IF is the ambient light current, ISIG<<IF), and the current is in the resistance R1, R2...RN A signal voltage is formed on it.

[0004] When the current I is small, VOUT=VS-I*(R1+R2+…+RN), its gain is 1 / Gm=R1+R2+…+RN; and when the current gradually increases, the voltage drop on the resistance is enough When the bypass tube is left open, its gain will gradually decrease. [00...

Examples

Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the implementations shown in the drawings, but it should be noted that these implementations are not limitations of the present invention, and those of ordinary skill in the art based on the functions, methods, or structural changes made by these implementations Equivalent transformations or substitutions all fall within the protection scope of the present invention.

[0040] Such as figure 2 , image 3 As shown, the ambient light compensation circuit for the infrared receiving device of the present invention includes an infrared receiving diode D1 and a load resistor RL, including:

[0041]A potential detection unit, the signal input terminal of the potential detection unit is connected to the first voltage signal output terminal VSAM, and the first voltage signal output terminal VSAM is connected to the common end of the infrared receiving diode D1 and the load resistor RL, and the potential...