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Infrared signal amplifying circuit

A technology of amplifying circuits and infrared signals, applied in amplifiers controlled by light, improving amplifiers to reduce temperature/power supply voltage changes, amplifiers with only semiconductor devices, etc., can solve the problem of ineffective amplification, signal saturation, infrared amplifier circuit design Inappropriate and other problems, to achieve the effect of cost saving, high precision, and improved anti-interference performance

Inactive Publication Date: 2014-04-02
QINGDAO GOERTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of improper design of existing infrared amplifying circuits, or the inability to be effectively amplified, or the existence of signal saturation, the present invention proposes an infrared signal amplifying circuit, and adopts the following technical solutions to realize it:

Method used

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  • Infrared signal amplifying circuit
  • Infrared signal amplifying circuit
  • Infrared signal amplifying circuit

Examples

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Embodiment 1

[0023] Embodiment one, refer to figure 1 , this embodiment proposes an amplifying circuit for amplifying the output electrical signal of an infrared sensor and preventing signal saturation, including five main parts: a filter circuit, a primary, secondary, and tertiary amplification circuit, and a bias circuit. The filter circuit is used to preprocess the output signal from the photoelectric sensor. The primary, secondary, and tertiary amplifier circuits filter and amplify the signal respectively, and the anti-saturation function is added to the primary and secondary amplifying circuits. The circuit provides the bias voltage required by the amplifying circuit, and improves the stability and anti-interference of signal amplification.

[0024] Its electrical schematic reference figure 2 ,and Figure 5 In this embodiment, the infrared signal amplifying circuit includes an infrared signal input terminal SIGNAL_IN, an amplifying circuit output terminal SIGNAL_OUT, and a first-st...

Embodiment 2

[0031] Embodiment two, refer to image 3, the difference with Embodiment 2 is that: Considering that the input signal of the first-stage operational amplifier is inherently weak, if the bias voltage is increased, the effective signal will drop significantly, while the second-stage and third-stage operational amplifiers pass through their previous stage After the operational amplifier is amplified, increasing the bias voltage has little impact on the useful signal, so according to actual specific needs, the bias voltages of the second and third stage amplifier circuits of this embodiment are provided by the bias circuit on the one hand, such as VN , on the other hand, it is provided by the system power supply voltage VCC, and then provides bias to the amplifier through the corresponding resistance, and under specific working conditions, the anti-interference performance of the amplifier circuit can be better improved.

Embodiment 3

[0032] Embodiment three, refer to Figure 4 , the difference from Embodiment 1 is that: according to actual needs, this embodiment adopts two-stage amplification, that is, one-stage and two-stage amplifying circuits, which filter and amplify the signal respectively, and only An anti-saturation function is added to the first-stage amplifier circuit. Other electrical principles are similar to Embodiment 1, and will not be repeated here.

[0033] Of course, according to the requirements of different circuits, you can choose to add an operational amplifier circuit, and at the same time choose to add an anti-saturation circuit in the secondary operational amplifier circuit.

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Abstract

The invention provides an infrared signal amplifying circuit which comprises an infrared signal input end, an amplifying circuit output end and an amplifying circuit body, wherein amplifying circuit body is connected between the infrared signal input end and the amplifying circuit output end. The amplifying circuit body comprises a primary operation amplifier and a secondary operation amplifier which are connected in sequence. Bias voltage is connected to each of the positive input end and the negative input end of each of the primary operation amplifier and the secondary operation amplifier. A first NPN type triode is connected between the output end and the reverse input end of the primary operation amplifier. The infrared signal amplifying circuit has the advantages that the features of to-be-amplified object signals are fully considered during design, multistage amplification is used, multistate filter is added, inference signals are removed, the anti-saturation triode is especially added on the basis of traditional signal amplification, useful data signals can be amplified, the defect that the signals are amplified to saturation during close range is overcome, temperature compensation is achieved, and the influence of interference on the signals is removed greatly.

Description

technical field [0001] The invention relates to an amplifying circuit, in particular to an infrared signal amplifying circuit. Background technique [0002] The communication method using infrared as a carrier for data transmission has the advantages of simple design and low cost. Infrared signals have the following problems in practical applications: 1. Infrared rays are a kind of invisible light in the sun's rays, which are easily affected by ambient light, causing interference to the signals transmitted by infrared signals; 2. Infrared signal transmission is at a short distance The point-to-point communication method, the short distance of the communication distance makes the intensity of the infrared light sensed by the infrared sensor different, and the output signal strength is also different. Generally, the signal is amplified by the amplifier circuit for transmission. Most of the existing amplifier circuits are improperly designed, or As a result, the long-distance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/08H03F1/30
Inventor 刘东宝
Owner QINGDAO GOERTEK