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Infrared receiving system direct current interference inhibiting circuit based on feedback

A technology for direct current interference and infrared reception, which can be applied to direct current circuits to reduce harmonics/ripples, transmission systems, and short-distance systems. It can solve the effects of infrared signal reception, DC operating point drift, and circuit performance. and other problems, to achieve the effect of increasing the magnification, improving the receiving ability, and improving the sensitivity

Inactive Publication Date: 2010-07-21
TIANJIN VAST TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, since the infrared signal is transmitted in an open environment, it means that the interference light generated by various interference light sources can also enter the infrared receiver along with the infrared signal, which will affect the correct reception of the infrared signal
The DC interference light generated by DC light sources such as sunlight and incandescent lamps will generate a DC interference current after entering the photodiode, which is equivalent to white noise after entering the infrared receiver, which will interfere with the weak infrared signal and cause the DC operation of the circuit Point drift will affect the performance of the circuit

Method used

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  • Infrared receiving system direct current interference inhibiting circuit based on feedback
  • Infrared receiving system direct current interference inhibiting circuit based on feedback
  • Infrared receiving system direct current interference inhibiting circuit based on feedback

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Embodiment Construction

[0016] Combine below figure 1 , figure 2 This embodiment will be described. This embodiment includes an error amplifier 1 , an adjustment tube 2 , a feedback resistor network 3 and a compensation circuit. The DC interference suppression circuit of the present invention is applied to the input end of the infrared receiving circuit, and the connection mode between the DC interference suppression circuit and the transimpedance preamplifier 4 is as follows figure 1 As shown, when the transimpedance preamplifier 4 adopts the mode of double-ended input and double-ended output, the two ends of the resistance network 3 are respectively connected with the two input ends of the transimpedance preamplifier, wherein the resistance network and the transimpedance preamplifier are forward After the input terminal is connected, it is also connected to the cathode of an external photodiode D, and the anode of the photodiode D is grounded. The output terminal of the error amplifier 1 is conn...

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Abstract

The invention relates to an infrared receiving system direct current interference inhibiting circuit based on feedback. A feedback circuit is formed in such a way that an error amplifier is connected with an adjusting pipe and the adjusting pipe is connected with a resistance network, and the feedback circuit can inhibit the direct current interference current at an input end of an infrared receiver. Aiming at the condition of direct current light interference existing in the infrared receiver, the direct current interference inhibiting circuit can inhibit the current of the direct current light at the input end of the infrared receiver by feedback, thereby reducing the influence of the current of the direct current light on a following circuit in the infrared receiver and ensuring that the infrared receiver can be stably operated.

Description

technical field [0001] The invention belongs to the circuit part of direct current interference suppression in an infrared receiving system, and particularly relates to a feedback circuit structure capable of suppressing direct current interference current at an input terminal of an infrared receiver—a feedback-based direct current interference suppression circuit for an infrared receiving system. Background technique [0002] Infrared is an electromagnetic wave with a wavelength between 0.75 μm and 100 μm. Its frequency is higher than that of microwaves and lower than that of visible light. It has received widespread attention because of its free use of frequency bands, especially after the establishment of the Infrared Communication Association in 1993. Obtain the compatibility of products from different manufacturers, and formulate the infrared communication protocol, so that the infrared technology has been developed more rapidly. Because infrared technology has the char...

Claims

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Application Information

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IPC IPC(8): H02J1/02H04B10/00H04B10/114
Inventor 王永生徐丽李景虎喻明艳朱怀宇
Owner TIANJIN VAST TECH
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