CN112671422A

CN112671422A - Infrared receiving chip with reusable test port

Info

Publication number: CN112671422A
Application number: CN202011549800.0A
Authority: CN
Inventors: 袁立成
Original assignee: Guangzhou Huixin Electronic Technology Co ltd
Current assignee: Guangzhou Huixin Electronic Technology Co ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-04-16
Anticipated expiration: 2040-12-24
Also published as: CN112671422B

Abstract

The invention discloses an infrared receiving chip with a reusable test port, which comprises a band-pass filter, a comparator, a signal integrating circuit, a shaping circuit and an automatic gain control module, wherein a signal of the band-pass filter is output to one port of a first switch, and the other port of a second switch is connected with an input port of the comparator; the signal integration circuit receives the output signal from the comparator, performs integration operation on the signal, converts the signal into a demodulated useful signal and outputs the signal; the shaping circuit receives a signal from the signal integrating circuit, shapes the waveform and outputs the waveform to an OUT port of the chip; the automatic gain control module receives a signal output by the comparator; the output end of the signal follower is connected with the TEST port of the chip and one port of the first switch, and the other port of the first switch is connected with the other port of the second switch and the input port of the comparator. The invention adds a multiplexing function to the TEST port, so that the TEST port can be used as an input port and an output port, and a chip TEST mode is added.

Description

Infrared receiving chip with reusable test port

Technical Field

The invention relates to an infrared receiving chip with a reusable test port, and belongs to the technical field of infrared receiving chips.

Background

A conventional infrared signal receiving system is shown in fig. 1.

And 100 represents an infrared signal receiving chip.

101 is an infrared light sensing diode which is externally connected to the chip and can receive an infrared light signal and convert the infrared light signal into a current signal to be transmitted to an IN port of the chip.

102 is a current-to-voltage conversion module inside the chip, which can receive the current signal from the IN port and convert it into a voltage signal to be output to the next module.

103 represents a preamplifier, which receives the voltage signal outputted from 102 and amplifies it for output.

104 is a representative gain adjustable amplifier, the module receives the voltage signal output by 103 and the gain control signal output by 109, the module adjusts the amplification gain multiple according to the gain control signal, and amplifies the voltage signal output by 103 according to the corresponding gain value and outputs the amplified voltage signal.

And 105 is a band-pass filter, which receives the output signal from 104, and outputs it after corresponding filtering.

Reference numeral 106 denotes a comparator which receives the output signal from the reference numeral 105, compares the signal with an internal reference voltage value, and outputs a corresponding comparison result, high level or low level.

Reference numeral 109 denotes an automatic gain control module (AGC), which receives 106 the output signal, determines whether the signal is a desired signal or undesired interference, and correspondingly lowers or raises the output gain control voltage signal, so that the chip loop can suppress interference and amplify the signal.

Reference numeral 107 denotes a representative signal integrating circuit, which receives the output signal from the reference numeral 106, integrates the signal, converts the signal into a demodulated useful signal, and outputs the signal.

Reference numeral 108 denotes a shaping circuit, which receives the signal from the reference numeral 107, shapes the waveform, and outputs the waveform to the OUT port of the chip.

And 110 is a representative signal follower which receives the output signal from the 105 module and outputs the signal follower to the TEST port TEST.

The working modes of the above conventional schemes are as follows: first, IN the operating mode, the signal follower of the signal follower 110 is turned off, TEST has no output, the IN port of the infrared signal receiving chip 100 inputs the infrared signal, and the OUT port outputs the signal after the chip operation. Second, in the TEST mode, the signal follower of the signal follower 110 is turned on, TEST serves as an output port, and the output signal of the pass filter 105 is output. The IN port of the infrared signal receiving chip 100 inputs an infrared signal, and the OUT port outputs a signal after the chip operation processing. In the prior art, the TEST port can only be used as an output in the TEST mode, only the output signal of the pass filter 105 can be tested, and the input signal cannot be tested. The test scheme has certain limitations. Therefore, an infrared receiving chip with a reusable test port is urgently needed to solve the problem existing in the prior art.

In order to solve the technical problems, a new technical scheme is especially provided.

Disclosure of Invention

The invention aims to provide an infrared receiving chip with a reusable test port, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an infrared receiving chip of multiplexing test port in area, includes band-pass filter, first switch, second switch, comparator, signal integral circuit, shaping circuit, automatic gain control module, wherein:

the signal of the band-pass filter is output to one port of the first switch, and the other port of the second switch is connected with the input port of the comparator;

the signal integration circuit receives the output signal from the comparator, performs integration operation on the signal, converts the signal into a demodulated useful signal and outputs the signal;

the shaping circuit receives the signal from the signal integrating circuit, shapes the waveform and outputs the waveform to an OUT port of the chip;

the automatic gain control module receives a signal output by the comparator;

the output end of the signal follower is connected with the TEST port of the chip and one port of the first switch, and the other port of the first switch is connected with the other port of the second switch and the input port of the comparator.

Preferably, the automatic gain control module receives the signal output by the comparator, determines whether the signal is a useful signal or a useless interference according to the signal, and correspondingly reduces or increases the gain control voltage signal at the output end, so that the chip loop can play a role in suppressing interference and amplifying the signal.

Compared with the prior art, the invention has the beneficial effects that: by adding a multiplexing function to the TEST port, the TEST port can be used as an input port and an output port, and the TEST mode of the chip is increased.

Drawings

Fig. 1 is a schematic structural diagram of a conventional infrared signal receiving system.

Fig. 2 is a schematic diagram of the structural principle of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 2 of the specification, the present invention provides a technical solution:

block 100 encompasses an infrared signal receiving chip,

the infrared light sensing diode externally connected to the chip 101 can receive the infrared light signal and convert the infrared light signal into a current signal to be transmitted to the IN port of the chip.

The current-voltage conversion module 102 inside the chip can receive the current signal from the IN port and convert it into a voltage signal to be output to the next module.

The preamplifier 103 receives the voltage signal output by the current-voltage conversion module 102, amplifies the voltage signal and outputs the amplified voltage signal.

The gain-adjustable amplifier 104 receives the voltage signal output by the preamplifier 103 and receives the gain control signal output by the automatic gain control module 109, which adjusts the amplification gain multiple according to the gain control signal, and amplifies the voltage signal output by the preamplifier 103 by the corresponding gain value and outputs the amplified voltage signal.

The signal of the band-pass filter 105 is output to one port of the first switch S1, and the other port of the second switch S2 is connected to the input port of the comparator;

the signal integration circuit 107 receives the output signal from the comparator 106, performs integration operation on the signal, converts the signal into a demodulated useful signal and outputs the signal;

the shaping circuit 108 receives the signal from the signal integrating circuit, shapes the waveform and outputs the waveform to the OUT port of the chip;

an automatic gain control module 109 (AGC) receives the signal output by the comparator; and judging whether the signal belongs to a useful signal or an useless interference according to the signal, and correspondingly reducing or increasing the gain control voltage signal of the output end, so that the chip loop can play the roles of suppressing the interference and amplifying the signal.

The output terminal of the signal follower is connected to the TEST port of the chip and one port of the first switch S1, and the other port of the first switch S1 is connected to the other port of the second switch S2 and the input port of the comparator 106.

The working modes of the scheme of the invention include a first working mode, wherein the signal follower 110 is closed, the first switch S1 is opened, the second switch S2 is closed, TEST has no output, an IN port of the infrared receiving chip 100 inputs an infrared signal, and an OUT port outputs a signal after chip operation processing. Second, in the first TEST mode, the signal follower 110 is turned on, the first switch S1 is turned off, the second switch S2 is turned on, and TEST is used as an output port to output the output signal of the band pass filter 105. The IN port of the infrared receiving chip 100 inputs an infrared signal, and the OUT port outputs a signal after the chip operation processing. Third, in the second TEST mode, the signal follower 110 is turned on, the first switch S1 is turned on, the second switch S2 is turned off, the TEST can be used as an output port to output the output signal of the bandpass filter 105, the TEST port can also be used as an input port to input an external signal from the TEST port, and since the design of the output driving capability of the signal follower 110 is limited, the module does not affect the TEST as the input port. In this mode, if the TEST port is used as the input port, a signal can be input from the TEST port, processed by the comparator 106, the signal integration circuit 107, and the shaping circuit 108, and then output from the OUT port. If the TEST port is used as an output port, a signal can be input from the IN port, processed by the current-voltage conversion module 102, the preamplifier 103, the gain adjustable amplifier 104, the band-pass filter 105 and the signal follower 110, and then output from the TEST port, and further, by adding a multiplexing function to the TEST port, the TEST port can be used as an input port or an output port, so that the TEST mode of the chip is increased.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an infrared receiving chip of multiplexing test port in area which characterized in that: including band-pass filter, first switch, second switch, comparator, signal integral circuit, shaping circuit, automatic gain control module, wherein:

the automatic gain control module receives a signal output by the comparator;

2. The infrared receiving chip with reusable test port of claim 1, wherein: the automatic gain control module receives the signal output by the comparator, judges whether the signal belongs to a useful signal or useless interference according to the signal, and correspondingly reduces or increases the gain control voltage signal of the output end, so that a chip loop can play the roles of suppressing interference and amplifying the signal.