CN205453670U - Infrared receiving circuit and infrared receiver - Google Patents
Infrared receiving circuit and infrared receiver Download PDFInfo
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- CN205453670U CN205453670U CN201620159025.0U CN201620159025U CN205453670U CN 205453670 U CN205453670 U CN 205453670U CN 201620159025 U CN201620159025 U CN 201620159025U CN 205453670 U CN205453670 U CN 205453670U
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Abstract
The utility model is suitable for an integrated circuit field provides an infrared receiving circuit and infrared receiver, and this circuit includes current -voltage translation unit, preamplifier, automatic gain control amplifying unit, amplitude limiting unit, band pass filter, comparator, comparator threshold value the control unit, demodulator and output stage to and detect the signal of inputing band pass filter signal amplitude controls when being too big the gain degradation's of automatic gain control amplifying unit signal amplitude detecting element, its input is connected with band pass filter's input, and its output is connected with the feedback end of automatic gain control amplifying unit. The utility model discloses a signal amplitude detecting element detects the signal of importing band pass filter, at the gain degradation who detects the too big time control automatic gain control amplifying unit of this signal amplitude to the band pass filter of assurance back level can stabilize work and a yard phenomenon can not appear losing.
Description
Technical field
This utility model belongs to integrated circuit fields, particularly relates to a kind of infrared receiving circuit and infrared remote receiver.
Background technology
Infrared remote receiver refers to receive the signal that infrared dispensing device is launched, and the signal received be amplified, process, the reception device of Xie Bo output.
nullThe implementation of existing infrared remote receiver is as shown in Figure 1，The faint light electric current received by light sensitive diode is as input signal，Faint voltage signal is converted to through current/voltage converting unit 1，After this voltage signal is amplified by preamplifier (Pre-amp) 2，Continue signal is amplified by automatic growth control amplifying unit (AGC-amp) 3 again，Unlike Pre-amp，The gain of AGC-amp can control，The output signal amplified through AGC-amp delivers to band filter (BPF) 5 filtering circuit noise by clipping unit 4，The output signal of BPF is detected，Testing result produces a gain control signal，Feed back to AGC-amp and go to control the gain of amplifying circuit，The reference voltage preset that output and the comparator threshold control unit 7 of BPF export is compared by comparator 6，Comparative result exports and filters carrier wave to demodulator 8，Thus the envelope of only output signal，The most again by output stage 9 to envelope shaping、Output，Thus complete the reception to infrared signal、Detection、Amplify、Filtering、Demodulation、Output procedure.
But, the signal signal amplitude remote control distance is remote when arrived due to infrared receiver is the least, so the signal amplifier gain of inside is typically made the biggest, general at 90dB～110dB, and when remote controller moves on to close from infrared receiving device, can seem that signal is the strongest when the input signal of circuit is far relative to remote control distance, when delivering to band-pass filter after inside is amplified, there will be band filter job insecurity, cause output to lose code, thus the phenomenon that closely remote control was lost efficacy occurs.
Utility model content
The purpose of this utility model embodiment is to provide a kind of infrared receiving circuit, it is intended to solve the problem that the closely remote control of present infrared receiving circuit was lost efficacy.
This utility model embodiment is realized in, a kind of infrared receiving circuit, including current/voltage converting unit, preamplifier, automatic growth control amplifying unit, clipping unit, band filter, comparator, comparator threshold control unit, demodulator and output stage, described circuit also includes:
The signal being input to band filter is detected, the signal amplitude detecting unit of the gain reduction of described automatic growth control amplifying unit is controlled when described signal amplitude is excessive, the input of described signal amplitude detecting unit is connected with the input of described band filter, and the outfan of described signal amplitude detecting unit is connected with the feedback end of described automatic growth control amplifying unit.
Further, described signal amplitude detecting unit includes:
Threshold voltage generation module and voltage comparator；
The outfan of described threshold voltage generation module is connected with the positive input of described voltage comparator, the reverse input end of described voltage comparator is the input of described signal amplitude detecting unit, and the outfan of described voltage comparator is the outfan of described signal amplitude detecting unit.
Further, described circuit also includes:
Mid frequency fuse trims unit, and the adjustable side of outfan and described band filter that described mid frequency fuse trims unit is connected.
Further, described circuit also includes:
Noise detection unit, the input of described noise detection unit is connected with the outfan of described band filter, and the outfan of described noise detection unit is connected with the feedback end of described automatic growth control amplifying unit.
The another object of this utility model embodiment is, it is provided that a kind of infrared remote receiver including above-mentioned infrared receiving circuit.
The signal being input to band filter is detected by this utility model embodiment by signal amplitude detecting unit, control the gain reduction of automatic growth control amplifying unit when detecting that this signal amplitude is excessive, thus ensure that the band filter energy steady operation of rear class does not haves and lose a yard phenomenon.The power of this circuit energy automatic decision input signal, then automatically control the gain of automatic growth control amplifying unit, solve the closely Problem of Failure of existing infrared remote receiver, and simple in construction, do not increase circuit cost, also will not introduce circuit noise, stability is high.
Accompanying drawing explanation
Fig. 1 is the structure chart of existing infrared receiving circuit；
The structure chart of the infrared receiving circuit that Fig. 2 provides for this utility model embodiment；
Fig. 3 is prior art waveform of band filter output when remote control distance is remote；
Fig. 4 is prior art waveform of signal output part output when remote control distance is remote；
Fig. 5 is prior art waveform of band filter output when remote control distance is near；
Fig. 6 is prior art waveform of signal output part output when remote control distance is near；
Infrared receiving circuit waveform of band filter output when remote control distance is near that Fig. 7 provides for this utility model embodiment；
Infrared receiving circuit waveform of signal output part output when remote control distance is near that Fig. 8 provides for this utility model embodiment.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.As long as just can be mutually combined additionally, technical characteristic involved in each embodiment of this utility model disclosed below does not constitutes conflict each other.
The signal being input to band filter is detected by this utility model embodiment by signal amplitude detecting unit, control the gain reduction of automatic growth control amplifying unit when detecting that this signal amplitude is excessive, thus ensure that the band filter energy steady operation of rear class does not haves and lose a yard phenomenon.
Fig. 2 shows the structure of the infrared receiving circuit that this utility model embodiment provides, and for convenience of description, illustrate only the part relevant to this utility model.
As this utility model one embodiment, this infrared receiving circuit can apply in any infrared remote receiver, and this infrared receiving circuit includes:
Outside current/voltage converting unit 1, preamplifier (Pre-amp) 2, automatic growth control amplifying unit (AGC-amp) 3, clipping unit 4, band filter (BPF) 5, comparator 6, comparator threshold control unit 7, demodulator 8 and output stage 9, also include:
Signal amplitude detecting unit 10, for the signal being input to band filter 5 is detected, once find that this signal amplitude is excessive, just produce a comparison signal by internal comparator, go to control the gain reduction of automatic growth control amplifying unit (AGC-amp) 3, thus ensure that the band filter energy steady operation of rear class does not haves and lose a yard phenomenon.
nullIn this utility model embodiment，The input of current/voltage converting unit 1 receives signal input，The outfan of current/voltage converting unit 1 connects the input of preamplifier (Pre-amp) 2，The outfan of preamplifier (Pre-amp) 2 connects the input of automatic growth control amplifying unit (AGC-amp) 3，The outfan of automatic growth control amplifying unit (AGC-amp) 3 connects the input of clipping unit 4，The outfan of clipping unit 4 connects the input of band filter (BPF) 5，The outfan of band filter (BPF) 5 is connected with the input of comparator 6 and the feedback end of automatic growth control amplifying unit (AGC-amp) 3 simultaneously，The outfan of comparator 6 connects the input of demodulator 8，The outfan of demodulator 8 connects the input of output stage 9，The outfan output signal output of output stage 9，The input of comparator threshold control unit 7 is connected with the input of comparator 6，The outfan of comparator threshold control unit 7 is connected with the reference edge of comparator 6，The input of signal amplitude detecting unit 10 is connected with the input of band filter (BPF) 5，The outfan of signal amplitude detecting unit 10 is connected with the feedback end of automatic growth control amplifying unit (AGC-amp) 3.
As this utility model one embodiment, signal amplitude detecting unit 10 includes:
Threshold voltage generation module and voltage comparator, the outfan of threshold voltage generation module is connected with the positive input of voltage comparator, the reverse input end of voltage comparator is the input of signal amplitude detecting unit 10, and the outfan of voltage comparator is the outfan of signal amplitude detecting unit 10.
As this utility model one preferred embodiment, this infrared receiving circuit also includes:
Mid frequency fuse trims unit 11, and the adjustable side of outfan and band filter 5 that mid frequency fuse trims unit 11 is connected.
In this utility model embodiment, the carrier frequency of infrared remote control is 37.9KHz, it is therefore desirable to trims unit 11 by mid frequency fuse and accurately controls the center frequency point of band filter 5, typically requires that center frequency point is at 38KHz+/-2KHz.
As this utility model one preferred embodiment, this infrared receiving circuit also includes:
Noise detection unit 12, for detecting the output signal of band filter 5, gain control signal is generated according to this output signal, the gain of feedback control automatic growth control amplifying unit 3, the input of noise detection unit 12 is connected with the outfan of band filter 5, and the outfan of noise detection unit 12 is connected with the feedback end of automatic growth control amplifying unit 3.
Illustrate below by way of contrast:
In existing technical scheme, when remote control distance is remote when, input signal is the most small, detect the output waveform of at this time band filter as it is shown on figure 3, the waveform of signal output part as shown in Figure 4, it can be seen that, now the waveform of Fig. 3 is normal, and the waveform of Fig. 4 is also normal；
And when closely remote control, input signal becomes strong, band filter meeting job insecurity at this time, the output waveform of band filter is as shown in Figure 5, the waveform of signal output part is as shown in Figure 6, can see that the pulse width of envelope becomes big (low level width exports virtual value into envelope), signal exports distortion, and present is to lose a yard phenomenon.
In this utility model embodiment, first signal amplitude detecting unit 10 produces a threshold voltage vt in inside, the basis of design of this threshold voltage vt is the amplitude of signal input, when being judged to stronger input signal, clipping unit 4 amplitude output signal can be more than threshold voltage vt, design a voltage comparator, the positive input input threshold voltage vt of voltage comparator, output signal Vf of reverse input end input saturation unit 4, when Vf is less than or equal to Vt, voltage comparator output low level, infrared receiving circuit workflow is completed by prior art；When Vf is more than Vt, voltage comparator output high level, this high level goes the gain controlling AGC-amp to make it reduce, now the output waveform of band filter is as shown in Figure 7, the waveform of signal output part is as shown in Figure 8, it can be seen that when closely remote control (when inputting strong signal), band filter can stably work, circuit output normal waveform, does not haves and loses code, remote control failure phenomenon.
The another object of this utility model embodiment is, it is provided that a kind of infrared remote receiver including above-mentioned infrared receiving circuit.
The signal being input to band filter is detected by this utility model embodiment by signal amplitude detecting unit, control the gain reduction of automatic growth control amplifying unit when detecting that this signal amplitude is excessive, thus ensure that the band filter energy steady operation of rear class does not haves and lose a yard phenomenon.The power of this circuit energy automatic decision input signal, then automatically control the gain of automatic growth control amplifying unit, solve the closely Problem of Failure of existing infrared remote receiver, and simple in construction, do not increase circuit cost, also will not introduce circuit noise, stability is high.
These are only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, within should be included in protection domain of the present utility model.
Claims (5)
1. an infrared receiving circuit, including current/voltage converting unit, preamplifier, automatic growth control amplifying unit, clipping unit, band filter, comparator, comparator threshold control unit, demodulator and output stage, it is characterized in that, described circuit also includes:
The signal being input to band filter is detected, the signal amplitude detecting unit of the gain reduction of described automatic growth control amplifying unit is controlled when described signal amplitude is excessive, the input of described signal amplitude detecting unit is connected with the input of described band filter, and the outfan of described signal amplitude detecting unit is connected with the feedback end of described automatic growth control amplifying unit.
2. circuit as claimed in claim 1, it is characterised in that described signal amplitude detecting unit includes:
Threshold voltage generation module and voltage comparator；
The outfan of described threshold voltage generation module is connected with the positive input of described voltage comparator, the reverse input end of described voltage comparator is the input of described signal amplitude detecting unit, and the outfan of described voltage comparator is the outfan of described signal amplitude detecting unit.
3. circuit as claimed in claim 1, it is characterised in that described circuit also includes:
Mid frequency fuse trims unit, and the adjustable side of outfan and described band filter that described mid frequency fuse trims unit is connected.
4. circuit as claimed in claim 1, it is characterised in that described circuit also includes:
Noise detection unit, the input of described noise detection unit is connected with the outfan of described band filter, and the outfan of described noise detection unit is connected with the feedback end of described automatic growth control amplifying unit.
5. an infrared remote receiver, it is characterised in that described infrared remote receiver includes the infrared receiving circuit as described in any one of Claims 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620159025.0U CN205453670U (en) | 2016-02-26 | 2016-02-26 | Infrared receiving circuit and infrared receiver |
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| CN201620159025.0U CN205453670U (en) | 2016-02-26 | 2016-02-26 | Infrared receiving circuit and infrared receiver |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291579A (en) * | 2016-08-31 | 2017-01-04 | 湖北久之洋红外系统股份有限公司 | A kind of laser detection system having cooperative target |
| CN106504513A (en) * | 2017-01-09 | 2017-03-15 | 上海胤祺集成电路有限公司 | Infrared receiving circuit |
| CN106781424A (en) * | 2017-01-09 | 2017-05-31 | 上海胤祺集成电路有限公司 | Infrared receiving circuit |
| CN106997660A (en) * | 2017-03-31 | 2017-08-01 | 泉芯电子技术(深圳)有限公司 | A kind of infrared remote receiver and its gain control method |
| CN108718216A (en) * | 2018-05-11 | 2018-10-30 | 中山大学 | Infrared receiver chip and its system |
| CN109981120A (en) * | 2017-12-27 | 2019-07-05 | 晨星半导体股份有限公司 | Signal receiving device and its signal processing method in communication system |
| CN111398982A (en) * | 2020-03-25 | 2020-07-10 | 杭州敏和光电子技术有限公司 | Infrared gesture recognition system and method |
| CN112217571A (en) * | 2019-07-09 | 2021-01-12 | 博通集成电路（上海）股份有限公司 | CMOS single-tube infrared transceiver |
| CN112671422A (en) * | 2020-12-24 | 2021-04-16 | 广州市慧芯电子科技有限公司 | Infrared receiving chip with reusable test port |
| CN113452388A (en) * | 2021-05-24 | 2021-09-28 | 深圳市中图仪器股份有限公司 | Weak signal self-adaptive conditioning device, infrared receiver and infrared transmission device |
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2016
- 2016-02-26 CN CN201620159025.0U patent/CN205453670U/en active Active
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291579A (en) * | 2016-08-31 | 2017-01-04 | 湖北久之洋红外系统股份有限公司 | A kind of laser detection system having cooperative target |
| CN106504513A (en) * | 2017-01-09 | 2017-03-15 | 上海胤祺集成电路有限公司 | Infrared receiving circuit |
| CN106781424A (en) * | 2017-01-09 | 2017-05-31 | 上海胤祺集成电路有限公司 | Infrared receiving circuit |
| CN106504513B (en) * | 2017-01-09 | 2023-08-18 | 上海胤祺集成电路有限公司 | Infrared receiving circuit |
| CN106997660A (en) * | 2017-03-31 | 2017-08-01 | 泉芯电子技术(深圳)有限公司 | A kind of infrared remote receiver and its gain control method |
| CN106997660B (en) * | 2017-03-31 | 2023-11-03 | 泉芯电子技术(深圳)有限公司 | Infrared receiver and gain control method thereof |
| CN109981120B (en) * | 2017-12-27 | 2021-08-27 | 联发科技股份有限公司 | Signal receiving apparatus in communication system and signal processing method thereof |
| CN109981120A (en) * | 2017-12-27 | 2019-07-05 | 晨星半导体股份有限公司 | Signal receiving device and its signal processing method in communication system |
| CN108718216A (en) * | 2018-05-11 | 2018-10-30 | 中山大学 | Infrared receiver chip and its system |
| CN112217571A (en) * | 2019-07-09 | 2021-01-12 | 博通集成电路（上海）股份有限公司 | CMOS single-tube infrared transceiver |
| CN112217571B (en) * | 2019-07-09 | 2022-02-22 | 博通集成电路（上海）股份有限公司 | CMOS single-tube infrared transceiver |
| CN111398982A (en) * | 2020-03-25 | 2020-07-10 | 杭州敏和光电子技术有限公司 | Infrared gesture recognition system and method |
| CN112671422A (en) * | 2020-12-24 | 2021-04-16 | 广州市慧芯电子科技有限公司 | Infrared receiving chip with reusable test port |
| CN112671422B (en) * | 2020-12-24 | 2022-08-12 | 广州市慧芯电子科技有限公司 | Infrared receiving chip with reusable test port |
| CN113452388A (en) * | 2021-05-24 | 2021-09-28 | 深圳市中图仪器股份有限公司 | Weak signal self-adaptive conditioning device, infrared receiver and infrared transmission device |
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