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I-V circuit of infrared receiving module

An infrared receiving and circuit technology, applied in non-electrical signal transmission systems, signal transmission systems, instruments, etc., can solve problems such as poor circuit performance, and achieve the effect of improving PSRR and performance

Pending Publication Date: 2017-12-08
杭州思泰微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of poor performance of the upper circuit, the present invention provides an I-V circuit of an infrared receiving module, which can effectively reduce the PSRR (power supply rejection ratio) of the circuit at the front end of the circuit and improve the performance of the circuit

Method used

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  • I-V circuit of infrared receiving module
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  • I-V circuit of infrared receiving module

Examples

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Embodiment Construction

[0012] See image 3 As shown, an I-V circuit of an infrared receiving module includes an operational amplifier 1, a PMOS transistor PM0 and a PMOS transistor PM1. Resistor R1 and photodiode 2, the photodiode here is externally connected, that is figure 1 In the leftmost photodiode, the two ends of the adjustable resistor R1 are the voltage signal output terminals VOUTN and VOUTP respectively, and the output voltage signal is sent to the preamplifier at the rear end. The source terminals of the PMOS transistor PM0 and PMOS transistor PM1 are connected to the current source One end of 3 and the bulk end are connected, and one end of the resistor R2 is connected, and the gate end is connected to the ground, the other end of the current source 3 and the other end of the resistor are both connected to the power supply VDD, the drain end of the PMOS transistor PM1 is grounded, and the drain end of the PMOS transistor PM0 is connected to the operational amplifier. The non-inverting ...

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PUM

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Abstract

The invention belongs to the field of analogue integrated circuits, and specifically relates to an I-V circuit of an infrared receiving module. The PSRR (power supply rejection ratio) of the circuit can be effectively reduced at the front end of the circuit, and the performance of the circuit is improved. The I-V circuit comprises an operational amplifier, the inverted input end of the operational amplifier is connected with the output end of the operational amplifier, the output end of the operational amplifier is connected with an adjustable resistor R1 and a photodiode which are connected in sequence, and two ends of the adjustable resistor R1 are voltage signal output ends respectively. The I-V circuit also comprises an MOS tube PM0 and an MOS tube PM1, the source end of the MOS tube PM0 and the source end of the MOS tube PM1 are connected and then are connected to one end of a current source, the bulk end of the MOS tube PM0 and the bulk end of the MOS tube PM1 are connected and then are connected to one end of a resistor R2, the grid end of the MOS tube PM0 and the grid end of the MOS tube PM1 are connected and then are grounded, the other end of the current source and the other end of the resistor are both connected to a power supply VDD respectively, the drain end of the MOS tube PM1 is grounded, the drain end of the MOS tube PM0 is connected to the normal-phase input end of the operational amplifier and one end of a capacitor C0, and the other end of the capacitor C0 is grounded.

Description

technical field [0001] The invention belongs to the field of analog integrated circuits, in particular to an I-V circuit of an infrared receiving module. Background technique [0002] Nowadays, electronic products have more and more functions, and infrared remote control has become a function of many products. The signal frequency emitted by the infrared remote control is 38KHz infrared light, and the I-V circuit is the front-end part of the infrared receiving module. It is a circuit that converts the current signal generated by the photodiode after receiving the infrared light into a voltage signal. See figure 1 shown. The performance of the I-V circuit will directly affect the performance of the infrared receiving module. [0003] Traditional I-V circuits such as figure 2 As shown, the increase in peripheral circuits of the product leads to more and more complex system power supply, and more and more ripples of different frequency components on the power supply. These ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08C23/04
CPCG08C23/04
Inventor 张南阳马辉
Owner 杭州思泰微电子有限公司
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