CN1913378A - Low dissipation radio transceiver analog front-end assembly for endoscope capsule system - Google Patents
Low dissipation radio transceiver analog front-end assembly for endoscope capsule system Download PDFInfo
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- CN1913378A CN1913378A CNA2006101125993A CN200610112599A CN1913378A CN 1913378 A CN1913378 A CN 1913378A CN A2006101125993 A CNA2006101125993 A CN A2006101125993A CN 200610112599 A CN200610112599 A CN 200610112599A CN 1913378 A CN1913378 A CN 1913378A
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- 239000002775 capsule Substances 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 230000008878 coupling Effects 0.000 claims abstract description 12
- 238000010168 coupling process Methods 0.000 claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 claims abstract description 12
- 239000013078 crystal Substances 0.000 claims abstract description 9
- 230000010355 oscillation Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 210000001035 gastrointestinal tract Anatomy 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000004962 physiological condition Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
This invention relates to a method for manufacturing endoscope capsules characterizing that a TR device simulates front IC, the antenna shared by the TR and TR switch, in which, said circuit includes: a receiver composed of an orderly serial low noise amplifier, a down frequency converter, a coupling capacitor, an automatic gain control loop and ASK demodulator, the input of the low noise amplifier is connected with the output of the TR switch, ASK decoder outputs digital information, the emitter includes: a crystal oscillator, a low frequency phase locking ring, an ASK modulator receiving digital information, a coupling capacitor, an upper frequency converter and a power amplifier connected in series orderly, the local signals of the upper and the lower converters are provided by the oscillator, the output of the power amplifier is connected with the related input of the TR switch and the antenna is connected with the related signal end of the switch.
Description
Technical field
The invention belongs to wineless endoscope capsule manufacturing technology field.
Background technology
At present, there are many people to be subjected to the puzzlement of disease of digestive tract.Traditional gastrocopy, patient will suffer exquisite pain.Along with science and technology development, people have proposed the wineless endoscope capsule technology, can greatly alleviate the misery of patient when doing digestive tract examining.A wineless endoscope capsule system is by forming with external two transceivers in the body.The transceiver of part has only the capsule size in the body, adopt small battery powered, have a small-sized imageing sensor and lighting device on the capsule, physiological conditions in the patient body can be noted, and send image to external receiver by wireless mode, external receiver recovers original image and shows on computers in real time, carries out state of an illness diagnosis for the doctor.For the work (as the camera angles rotation of mistake re-transmission, imageing sensor, the brightness regulation of lighting device etc.) of transceiver in the control volume, external transceiver can send instruction wirelessly to transceiver in the body, the work of transceiver in the control volume.Transmitting on the data transfer rate and since in the body toward external transmission be view data, data volume is big, thus must have bigger data transfer rate during toward external transmission in the body (＞1Mbps); And external in the body transmission only be control command, data volume is little, only data transfer rate that need be less (＞128bps), they are a kind of asymmetric transmission systems.
In this wineless endoscope capsule system, the realization of transceiver is the emphasis of research in the body.It must be in limited space integrated all functional modules, and owing to adopt powered battery, whole system must have extremely low power consumption.And in whole body in the transceiver, the realization of radio transceiver analog front-end is again the part of most critical wherein.
The present invention proposes a kind of low dissipation radio transceiver analog front-end assembly that is applied to endoscope capsule system.Receive link and adopt the ASK modulation system, can from the weak radio-frequency signal that antenna receives, directly detect digital information; Transmitting chain also adopts the ASK modulation system, digital information can be changed into the radiofrequency signal of certain power output, and launches by antenna.This transceiver architecture has been avoided the very high circuit modules such as A-D converter, digital-to-analog converter and RF Phase-Lock Loop of power consumption, circuit power consumption is reduced greatly, this transceiver architecture need not use and be difficult to integrated components and parts simultaneously, entire circuit can all be integrated in on the chip piece, have high integrated level, thereby can reduce product size and cost greatly.
Summary of the invention
The objective of the invention is to propose a kind of low dissipation radio transceiver analog front-end assembly of using without the endoscope capsule system of A-D converter, digital-to-analog converter and RF Phase-Lock Loop circuit.
The invention is characterized in, contain: antenna, transmit-receive switch and radio transceiver analog front-end integrated circuit, wherein:
Transmit-receive switch is provided with: the in-out end, with described antenna interconnection;
The radio transceiver analog front-end integrated circuit, contain: Receiver And Transmitter, wherein:
Receiver contains:
Low noise amplifier, input links to each other with the radiofrequency signal output of described transmit-receive switch;
Low-converter, radio-frequency (RF) signal input end links to each other with the output of described low noise amplifier;
Oscillator, the local oscillation signal output links to each other with the respective input of described low-converter;
Automatic gain control loop comprises:
Variable gain amplifier, the radio-frequency (RF) signal input end after the frequency conversion links to each other with the output of described low-converter through a receiver ac coupling capacitor;
Fixed gain amplifier, input links to each other with the output of described variable gain amplifier;
Peak detector, the peak signal input links to each other with the output of described fixed gain amplifier, and the control signal output ends of this peak detector links to each other with the control end of described variable gain amplifier;
Mutual conductance-capacitive filter, the filtering signal input links to each other with described variable gain amplifier output, and the filtering signal output of this filter then links to each other with the respective input of described variable gain amplifier;
The ASK demodulator, input links to each other with the output of described fixed gain amplifier, and the output of ASK demodulator is then exported the digital information after the recovery;
Transmitter contains:
Crystal oscillator;
Low-frequency phase-locking ring comprises:
Chuan Jie phase frequency detector, loop filter successively, and circular type shaker, wherein, the input of phase frequency detector links to each other with the signal output part of described crystal oscillator;
Four-divider, the fractional frequency signal input links to each other with the oscillator signal output of described circular type shaker, and the fractional frequency signal output of this four-divider links to each other with the respective input of described phase frequency detector;
The ASK modulator, the modulation signal input links to each other with the corresponding output end of described circular type shaker, and this ASK modulator also is provided with digital information input waiting for transmission;
Signal input part before the upconverter, frequency conversion links to each other with the output of described ASK modulator through a transmitter ac coupling capacitor, and the local oscillation signal input of this upconverter then links to each other with the corresponding output end of described oscillator;
Power amplifier, signal input part links to each other with the respective radio-frequency signals output of described upconverter, and the output of this power amplifier then links to each other with the output radiofrequency signal receiving terminal of described transmit-receive switch, with to described antenna transmission.
The present invention proposes a kind of low dissipation radio transceiver analog front-end assembly that is applied to endoscope capsule system.Receive link and adopt the ASK modulation system, can from the weak radio-frequency signal that antenna receives, directly detect digital information; Transmitting chain also adopts the ASK modulation system, digital information can be changed into the radiofrequency signal of certain power output, and launches by antenna.This transceiver architecture has been avoided the very high circuit modules such as A-D converter, digital-to-analog converter and RF Phase-Lock Loop of power consumption, make circuit power consumption reduce (circuit power consumption can less than 15mW) greatly, this transceiver architecture need not use and be difficult to integrated components and parts simultaneously, entire circuit can all be integrated in on the chip piece, have high integrated level, thereby can reduce product size and cost greatly.
Description of drawings
The schematic block circuit diagram of the low dissipation radio transceiver analog front-end assembly that Fig. 1, endoscope capsule system use
Embodiment
This radio transceiver analog front-end has adopted is convenient to integrated topological structure and half-duplex communication mode, and a communication channel is only arranged, system configuration as shown in Figure 1, wherein the circuit module in the solid box can be integrated in on the chip piece.
This transceiver analog front-end is made up of Receiver And Transmitter two parts, and wherein receiver comprises following circuit module: antenna, transmit-receive switch, low noise amplifier, low-converter, oscillator, ac coupling capacitor, variable gain amplifier, fixed gain amplifier (gain is 20 decibels), peak detector, mutual conductance-capacitive filter and ASK demodulator; Transmitter comprises following circuit module: crystal oscillator, phase frequency detector, loop filter, circular type shaker, four-divider, ASK modulator, ac coupling capacitor, upconverter, oscillator, power amplifier, transmit-receive switch and antenna.Wherein, antenna, transmit-receive switch and oscillator are shared by Receiver And Transmitter two parts institute.Annexation between these circuit modules is: a signal end (in_out) of antenna and transmit-receive switch joins, another signal end (RF_IN) of transmit-receive switch is connected to the input of low noise amplifier, and the 3rd signal end (RF_OUT) of transmit-receive switch is connected to the output of power amplifier; The output of low noise amplifier is connected to the radio-frequency (RF) signal input end (Rx_RF) of low-converter, an output of oscillator is connected to the local oscillation signal input (Rx_LO) of low-converter, the output of low-converter (Rx_IF) is connected to an end of receiver ac coupling capacitor, and the other end of receiver ac coupling capacitor is connected to the signal input part of variable gain amplifier (Vin); The output of variable gain amplifier is connected to the input of fixed gain amplifier and mutual conductance-capacitive filter, the output of mutual conductance-capacitive filter is connected to the frequency characteristic control end (Fctrl) of variable gain amplifier, the output of fixed gain amplifier is connected to the input of ASK demodulator and peak detector, and the output of peak detector is connected to the gain control end of variable gain amplifier (Gctrl); The output of ASK demodulator is the digital information that recovers; The output of crystal oscillator is connected to the reference frequency input (Fref) of phase frequency detector, the output of phase frequency detector is connected to the input of loop filter, the output of loop filter is connected to the input of circular type shaker, the output of circular type shaker is connected to the input of ASK modulator and four-divider, and the output of four-divider is connected to the crossover frequency input (Fdiv) of phase frequency detector; Digital information waiting for transmission is given the data input pin (Tx_DATA) of ASK modulator; The output of ASK modulator is connected to an end of transmitter ac coupling capacitor, and the other end of transmitter ac coupling capacitor is connected to the signal input part of upconverter (Tx_IF); The output of oscillator is connected to the local oscillation signal input (Tx_LO) of upconverter, and the output of upconverter (Tx_RF) is connected to the input of power amplifier.
The operation principle of this transceiver is soluble as follows:
Receiving on the link, the radiofrequency signal that receives from antenna is sent into low noise amplifier and is amplified behind transmit-receive switch, signal after the amplification carries out mixing with the local oscillation signal that oscillator comes, be fixed the intermediate-freuqncy signal of frequency (10MHz), intermediate-freuqncy signal by an automatic gain control loop (by variable gain amplifier, fixed gain amplifier, the peak detector formation) adjusts its amplitude, and by the mutual conductance-capacitive filter filtering low-frequency noise of a feedback and the influence of DC maladjustment, sending into the ASK demodulator then differentiates, directly recover digital signal, give other circuit and further handle.
On transmitter chain, the low-frequency phase-locking ring of a 20MHz provides (comprising crystal oscillator, phase frequency detector, loop filter, circular type shaker, four-divider) intercarrier signal of constant amplitude, this carrier signal is after the ASK modulators modulate, upconverter, carry out mixing with the local oscillation signal that comes from oscillator, resulting radiofrequency signal is sent into a power amplifier, the effect of this power amplifier provides powerful radio frequency output signal, this output signal is gone out by aerial radiation behind transmit-receive switch.Low-frequency phase-locking ring provides reference frequency by a crystal oscillator, and the output of low-frequency phase-locking ring produces a desirable sinusoidal signal, avoids exporting producing too much harmonic wave, reduces the utilization ratio of transmitter.
Because the endoscopic system of being studied adopts single-channel communication mode, local oscillation signal is only provided by an oscillator with fixed frequency, this oscillator produces the rf oscillation signal of fixed frequency (2.4GHz), low-converter in the driving receiver and the upconverter in the transmitter.
Claims (1)
1. the low dissipation radio transceiver analog front-end assembly used of endoscope capsule system is characterized in that, contains: antenna, transmit-receive switch and radio transceiver analog front-end integrated circuit, wherein:
Transmit-receive switch is provided with: the in-out end, with described antenna interconnection;
The radio transceiver analog front-end integrated circuit, contain: Receiver And Transmitter, wherein:
Receiver contains:
Low noise amplifier, input links to each other with the radiofrequency signal output of described transmit-receive switch;
Low-converter, radio-frequency (RF) signal input end links to each other with the output of described low noise amplifier;
Oscillator, the local oscillation signal output links to each other with the respective input of described low-converter;
Automatic gain control loop comprises:
Variable gain amplifier, the radio-frequency (RF) signal input end after the frequency conversion links to each other with the output of described low-converter through a receiver ac coupling capacitor;
Fixed gain amplifier, input links to each other with the output of described variable gain amplifier;
Peak detector, the peak signal input links to each other with the output of described fixed gain amplifier, and the control signal output ends of this peak detector links to each other with the control end of described variable gain amplifier;
Mutual conductance-capacitive filter, the filtering signal input links to each other with described variable gain amplifier output, and the filtering signal output of this filter then links to each other with the respective input of described variable gain amplifier;
The ASK demodulator, input links to each other with the output of described fixed gain amplifier, and the output of ASK demodulator is then exported the digital information after the recovery;
Transmitter contains:
Crystal oscillator;
Low-frequency phase-locking ring comprises:
Chuan Jie phase frequency detector, loop filter successively, and circular type shaker, wherein, the input of phase frequency detector links to each other with the signal output part of described crystal oscillator;
Four-divider, the fractional frequency signal input links to each other with the oscillator signal output of described circular type shaker, and the fractional frequency signal output of this four-divider links to each other with the respective input of described phase frequency detector;
The ASK modulator, the modulation signal input links to each other with the corresponding output end of described circular type shaker, and this ASK modulator also is provided with digital information input waiting for transmission;
Signal input part before the upconverter, frequency conversion links to each other with the output of described ASK modulator through a transmitter ac coupling capacitor, and the local oscillation signal input of this upconverter then links to each other with the corresponding output end of described oscillator;
Power amplifier, signal input part links to each other with the respective radio-frequency signals output of described upconverter, and the output of this power amplifier then links to each other with the output radiofrequency signal receiving terminal of described transmit-receive switch, with to described antenna transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101125993A CN1913378A (en) | 2006-08-25 | 2006-08-25 | Low dissipation radio transceiver analog front-end assembly for endoscope capsule system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101125993A CN1913378A (en) | 2006-08-25 | 2006-08-25 | Low dissipation radio transceiver analog front-end assembly for endoscope capsule system |
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| CN1913378A true CN1913378A (en) | 2007-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2006101125993A Pending CN1913378A (en) | 2006-08-25 | 2006-08-25 | Low dissipation radio transceiver analog front-end assembly for endoscope capsule system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163982A (en) * | 2011-01-24 | 2011-08-24 | 中国科学院半导体研究所 | OOK (on-off keying) receiving device with low power consumption |
| CN103368601A (en) * | 2013-06-03 | 2013-10-23 | 深圳清华大学研究院 | Front end of wireless communication transceiver |
| CN101784222B (en) * | 2007-08-30 | 2014-04-09 | 奥林巴斯医疗株式会社 | Capsule type medical device |
| TWI561015B (en) * | 2014-10-28 | 2016-12-01 | Realtek Semiconductor Corp | Front-end circuit of wireless communication system and wireless communication system |
| CN108451487A (en) * | 2018-03-26 | 2018-08-28 | 深圳市资福医疗技术有限公司 | A kind of device ensuring capsule endoscope data transmit-receive stability |
| CN111220847A (en) * | 2019-05-21 | 2020-06-02 | 一诺仪器（中国）有限公司 | Frequency conversion system and spectrum analyzer |
-
2006
- 2006-08-25 CN CNA2006101125993A patent/CN1913378A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101784222B (en) * | 2007-08-30 | 2014-04-09 | 奥林巴斯医疗株式会社 | Capsule type medical device |
| CN102163982A (en) * | 2011-01-24 | 2011-08-24 | 中国科学院半导体研究所 | OOK (on-off keying) receiving device with low power consumption |
| CN102163982B (en) * | 2011-01-24 | 2014-03-12 | 中国科学院半导体研究所 | OOK (on-off keying) receiving device with low power consumption |
| CN103368601A (en) * | 2013-06-03 | 2013-10-23 | 深圳清华大学研究院 | Front end of wireless communication transceiver |
| TWI561015B (en) * | 2014-10-28 | 2016-12-01 | Realtek Semiconductor Corp | Front-end circuit of wireless communication system and wireless communication system |
| CN108451487A (en) * | 2018-03-26 | 2018-08-28 | 深圳市资福医疗技术有限公司 | A kind of device ensuring capsule endoscope data transmit-receive stability |
| CN111220847A (en) * | 2019-05-21 | 2020-06-02 | 一诺仪器（中国）有限公司 | Frequency conversion system and spectrum analyzer |
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