CN102315885B - Signal strength sensing device, relevant method thereof and communication system - Google Patents
Signal strength sensing device, relevant method thereof and communication system Download PDFInfo
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- CN102315885B CN102315885B CN201010215127.7A CN201010215127A CN102315885B CN 102315885 B CN102315885 B CN 102315885B CN 201010215127 A CN201010215127 A CN 201010215127A CN 102315885 B CN102315885 B CN 102315885B
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Abstract
The invention discloses a signal strength sensing device used in a communication system, a relevant method thereof and the communication system. The sensing device is coupled to a frequency-down frequency mixer of the communication system. The frequency-down frequency mixer is used for receiving and converting a first signal into a second signal, and the frequency of the second signal is lower than that of the first signal. The signal strength sensing device comprises a frequency-up frequency mixer and a sensing unit. The frequency-up frequency mixer is used for receiving and converting the second signal into a third signal, and the frequency of the third signal is higher than that of the second signal. The sensing unit is used for sensing the strength of the third signal and generating a signal strength pointer to the communication system according to a sensing result corresponding to the strength of the third signal, wherein the signal strength pointer represents the strength of the first signal when the first signal is received at the frequency-down frequency mixer.
Description
Technical field
The present invention relates to a kind of device and correlation technique and communication system of detection signal, relate in particular to a kind of device and correlation technique and communication system of signal strength signal intensity detecting in communication system.
Background technology
Automatic gain is controlled (Automatic Gain Control, AGC) and is conventionally applied to, in radio frequency receiver, be used in AFE (analog front end), adjusts the intensity that receives signal, can excessive distortion when converting rear end digital signal to so that receive signal.Before adjusting gain, receiver must first measure the intensity that receives signal, to make suitable adjusting range.
Radio frequency receiver has one or several amplifier and analog-to-digital converter conventionally, and amplifier is variable gain amplifier, and analog-to-digital converter all has a linear transformation scope.Radio frequency receiver, according to detected signal strength signal intensity, is adjusted amplifier gain, so that the signal that analog-to-digital converter receives maintains in conversion range, prevents distortion.
Typical signal strength signal intensity detecting mode is the received signal strength that directly detecting is downconverted to intermediate frequency or close fundamental frequency, then according to these signal strength signal intensities, adjusts the gain of the amplifier of corresponding position.Fig. 2 that No. 7212798th, U.S. Patent number discloses the device of a received signal strength detecting, and its minute three parts from intermediate frequency to low frequency in receiving signal path are done signal strength signal intensity detecting, i.e. the signal strength signal intensity of Fig. 2 detecting indication 227,217 and 231.Yet at low frequency place, (as 200 KHz) make the longer signal stabilization time (Settling Time) of process need of signal strength signal intensity detecting, and signal waveform easily produces ripple (Ripple).Moreover in order to lower ripple phenomenon, signal strength signal intensity arrangement for detecting often needs the capacitor that capacitance is larger, therefore also need to use more circuit area.
Summary of the invention
Main purpose of the present invention is to provide a kind of signal strength signal intensity arrangement for detecting and correlation technique and communication system, and efficiency and the accuracy of its detecting of can gaining in strength, also can reduce circuit usable floor area in addition.
The present invention mainly utilizes raising frequency after the first frequency reducing of a reception signal of communication system, then carries out the intensity detecting of this reception signal.
The present invention discloses a kind of signal strength signal intensity arrangement for detecting for a communication system, and it is coupled to a down mixer of this communication system.This down mixer is used for receiving and changes first signal to secondary signal, and a frequency of this secondary signal is lower than a frequency of this first signal.This signal strength signal intensity arrangement for detecting includes a up-converter mixer and a detecting unit.This up-converter mixer is used for receiving and changes this secondary signal to one the 3rd signal, and a frequency of the 3rd signal is higher than this frequency of this secondary signal.This detecting unit is used for detecting an intensity of the 3rd signal, and according to a detecting result of this intensity corresponding to the 3rd signal, produce a signal strength indicator to this communication system, wherein this signal strength indicator represents the intensity of this first signal when this down mixer end is received, wherein this down mixer is utilized a centre frequency, change this first signal to this secondary signal, and this up-converter mixer is utilized this centre frequency, change this secondary signal to the 3rd signal, wherein this centre frequency is the centre frequency that this first signal corresponding receives signal.
The another signal strength signal intensity method for detecting that discloses an a kind of signal strength signal intensity arrangement for detecting for a communication system of the present invention.This signal strength signal intensity arrangement for detecting is coupled to a down mixer of this communication system, and it is used for receiving and changes first signal to secondary signal, and wherein a frequency of this secondary signal is lower than a frequency of this first signal.This signal strength signal intensity method for detecting includes and receives and change this secondary signal to one the 3rd signal, and a frequency of the 3rd signal is higher than this frequency of this secondary signal; Detect an intensity of the 3rd signal; And according to a detecting result of this intensity corresponding to the 3rd signal, produce a signal strength indicator to this communication system, wherein this signal strength indicator represents the intensity of this first signal when this down mixer end is received, wherein this down mixer is utilized a centre frequency, change this first signal to this secondary signal, and this up-converter mixer is utilized this centre frequency, change this secondary signal to the 3rd signal, wherein this centre frequency is the centre frequency that this first signal corresponding receives signal.
A kind of communication system of the another exposure of the present invention, it comprises a signal receiving circuit and a signal transmission circuit.This communication system includes a down mixer, a up-converter mixer and a detecting unit.Down mixer is contained in this signal receiving circuit, and in order to receive and to change first signal to secondary signal, a frequency of this secondary signal is lower than a frequency of this first signal.This up-converter mixer is contained in this signal transmission circuit, and be coupled to this down mixer, be used for when this communication system does not transmit, receive and change this secondary signal to one the 3rd signal, a frequency of the 3rd signal is higher than this frequency of this secondary signal.This detecting unit is coupled to this up-converter mixer, be used for detecting an intensity of the 3rd signal, and according to a detecting result of this intensity corresponding to the 3rd signal, produce a signal strength indicator, wherein this signal strength indicator represents the intensity of this first signal when this down mixer end is received, wherein this down mixer is utilized a centre frequency, change this first signal to this secondary signal, and this up-converter mixer is utilized this centre frequency, change this secondary signal to the 3rd signal, wherein this centre frequency is the centre frequency that this first signal corresponding receives signal.
A kind of signal strength signal intensity method for detecting for a communication system of the another exposure of the present invention, include in a signal receiving circuit of this communication system, receive and change first signal to secondary signal, a frequency of this secondary signal is lower than a frequency of this first signal; In a signal transmission circuit of this communication system, when this communication system does not transmit, receive and change this secondary signal to one the 3rd signal, a frequency of the 3rd signal is higher than this frequency of this secondary signal; Detect an intensity of the 3rd signal; And according to a detecting result of this intensity corresponding to the 3rd signal, produce a signal strength indicator, wherein this signal strength indicator represents the intensity of this first signal when this down mixer end is received, wherein this down mixer is utilized a centre frequency, change this first signal to this secondary signal, and this up-converter mixer is utilized this centre frequency, change this secondary signal to the 3rd signal, wherein this centre frequency is the centre frequency that this first signal corresponding receives signal.
A kind of signal strength signal intensity arrangement for detecting for a communication system of the another exposure of the present invention.This communication system comprises a signal receiving circuit and a signal transmission circuit, and this signal receiving circuit has a down mixer, and this signal transmission circuit has a up-converter mixer.This signal strength signal intensity arrangement for detecting is coupled to a down mixer of this communication system, and this down mixer is used for receiving and changes first signal to secondary signal, and a frequency of this secondary signal is lower than a frequency of this first signal.This signal strength signal intensity arrangement for detecting includes a up-converter mixer, is used for receiving and changes this secondary signal to one the 3rd signal, and the frequency of the 3rd signal is higher than the frequency of this secondary signal, an and detecting unit, be used for detecting an intensity of the 3rd signal, and according to a detecting result of this intensity corresponding to the 3rd signal, produce a signal strength indicator to this communication system, wherein the intensity of the 3rd signal represents the intensity of this first signal when this down mixer end is received, wherein this down mixer is utilized a centre frequency, change this first signal to this secondary signal, and this up-converter mixer is utilized this centre frequency, change this secondary signal to the 3rd signal, wherein this centre frequency is the centre frequency that this first signal corresponding receives signal.
The disclosed intensity arrangement for detecting of signal of the present invention and correlation technique thereof and communication system are applicable in the receiving system of time division multiplexing or frequency division multiplex, and on being used in time-division multiplex system time, do not need additional circuit utilization both to deposit the circuit of receiver and reflector, complete the intensity detecting of this reception signal.
Accompanying drawing explanation
Fig. 1 is for adopting the schematic diagram of a radio-frequency (RF) transceiver of signal strength signal intensity detecting concept of the present invention.
Fig. 2 is the schematic diagram of detection signal intensity of the present invention.
Fig. 3 is the schematic diagram of the present invention's one signal strength signal intensity detecting flow process.
Fig. 4 is for adopting the schematic diagram of a receiver of signal strength signal intensity detecting concept of the present invention.
Fig. 5 is the configuration diagram for the peak value detector of Fig. 4 detecting unit.
Fig. 6 is for adopting the schematic diagram of a radio-frequency (RF) transceiver of signal strength signal intensity detecting concept of the present invention.
Fig. 7 is for adopting the schematic diagram of a receiver of signal strength signal intensity detecting concept of the present invention.
Wherein, description of reference numerals is as follows:
10,60 radio-frequency (RF) transceiver
12,42 antennas
13,43 band pass filters
14 switchs
15,40,70 receivers
16 reflectors
19 adjustment units
S
b, S
b1bandpass signal
100,150 bar wheel transducers
102,402 low noise amplifiers
114,124 intermediate frequency amplifiers
116,126 analog-to-digital converters
S
bIisopic zone messenger
S
bQperpendicular band messenger
S
iFintermediate-freuqncy signal
S
iFIhomophase fundamental frequency signal
S
iFQquadrature baseband signal
152 power amplifiers
154 adders
162,172 low pass filters
164,174 variable gain amplifiers
166,176 digital to analog converters
HFS high-frequency signal
30 flow processs
416,426 analog-to-digital converters
HFS_I, HFS1_I homophase high-frequency signal
HFS_Q, HFS1_Q quadrature high-frequency signal
480,780 demodulating units
472 operational amplifiers
474 transistors
476 current sources
R resistance
C capacitor
SIN input signal
VOUT output voltage
17,475,617,77 detecting units
112,122,412,422 intermediate-frequency filters
300,310,320,330,340,350 steps
110,120,160,170,410,420,460, frequency mixer
470
Embodiment
Please refer to Fig. 1, Fig. 1 is for adopting the first embodiment schematic diagram of a radio-frequency (RF) transceiver 10 of signal strength signal intensity detecting concept of the present invention.Radio-frequency (RF) transceiver 10 comprises an antenna 12, a band pass filter 13, a switch 14, a receiver 15, a reflector 16, a detecting unit 17 and an adjustment unit 19, it is applicable to a time division multiplexing (Time Division Duplex, TDD) communication system, by switch 14, switch, by receiver 15, receive signal or send a signal to antenna 12 by reflector 16.The wireless signal that band pass filter 13 is used for catching from antenna 12 leaches a bandpass signal S
b(being the reception signal of radio-frequency (RF) transceiver 10), its signal frequency central point can be carrier frequency (centre frequency) fc that receives signal.Receiver 15 comprises bar wheel (Balun) transducer 100, a low noise amplifier (Low Noise Amplifier, LNA) 102, and form a signal homophase (In-phase) RX path partly by a frequency mixer 110, an intermediate-frequency filter 112, an intermediate frequency amplifier 114 and an analog-to-digital converter 116, and the RX path that is formed a signal in orthogonal (Quadrature) part by a frequency mixer 120, an intermediate-frequency filter 122, an intermediate frequency amplifier 124 and an analog-to-digital converter 126.Ba Lun transducer 100, in simple terms, is for connecting two wires of balance and the unbalanced coaxial cable of antenna 12 these one end of receiver 15 these one end, makes its two ends tool impedance balance and increases antenna bandwidth.The function of Ba Lun transducer 100 should be those skilled in the art to be known, therefore do not described in detail.Low noise amplifier 102 is variable gain amplifier (Variable Gain Amplifier, VGA), is used for adjusting bandpass signal S
bsignal.In the in-phase signal path of receiver 15, frequency mixer 110 and 120 is mainly used to bandpass signal S
bbe downconverted to an intermediate-freuqncy signal S
iF(not being shown in Fig. 1), it is divided into a homophase intermediate-freuqncy signal S
iFIan and quadrature intermediate-freuqncy signal S
iFQ-.Frequency mixer 110 in in-phase path is used for frequency reducing bandpass signal S
bto fundamental frequency or approach the homophase intermediate-freuqncy signal S of fundamental frequency
iFI.Homophase intermediate-freuqncy signal S
iFIthrough intermediate-frequency filter 112 filtering, and through intermediate frequency amplifier 114(variable gain amplifier) adjust signal amplitude, the baseband circuit that finally converts digital signal to and deliver to rear end from analog to digital quantizer 116 is done further signal demodulation.The orthogonal signalling path operations of receiver 15 is similar to aforementioned in-phase signal path operations, therefore repeats no more.
In addition, reflector 16 comprises a bar wheel transducer 150, a power amplifier 152, an adder 154, and form a transmission path that transmits in-phase component by a frequency mixer 160, a low pass filter 162, a variable gain amplifier 164 and a digital to analog converter 166, and form a transmission path that transmits quadrature component by a frequency mixer 170, a low pass filter 172, a variable gain amplifier 174 and a digital to analog converter 176.The operating principle of reflector 16 is the contrary operation of receiver 15, and therefore principle please refer to aforementioned in detail.
Main concept of the present invention is to allow signal in high frequency region, carry out intensity detecting, and its concept is implemented in the below explanation that operates in radio-frequency (RF) transceiver 10.High frequency region can be considered far above fundamental frequency, approaches the frequency band of radio frequency.
Radio-frequency (RF) transceiver 10 can be to received signal (as bandpass signal S
b) carry out automatic gain control, it is according to detected signal strength signal intensity, adjust the amplifier gain of receiver 15 inside, can be not excessive or too small so that receive the intensity of signal when analog-to-digital converter 116 and 126 is received, and then allow analog-to-digital converter 116 and 126 can change out correct digital received signal.In radio-frequency (RF) transceiver 10, the intensity detecting that receives signal is frequency mixer 110 and the 120 frequency reducing bandpass signal S that utilize receiver 15
b, then utilize the frequency mixer 160 of reflector 16 and 170 raising frequencies by the bandpass signal S of frequency reducing
b(be homophase fundamental frequency signal S
iFIwith quadrature baseband signal S
iFQ-), finally by by detecting unit 17 detecting by the homophase fundamental frequency signal S of raising frequency
iFIwith quadrature baseband signal S
iFQthe intensity of (i.e. a high-frequency signal HFS).Frequency mixer 160 and 170 is when reflector 16 is not used for transmitting, the raising frequency of just detecting for intensity.Detecting unit 17, according to intensity detecting result, produces a signal strength indicator RSSI, and it is fitted can represent bandpass signal S
bintensity when frequency mixer 110 and 120 ends are received.Adjustment unit 19 has automatic gain and controls (Auto Gain Control, AGC) function, and it adjusts at least gain of one in low noise amplifier 102, intermediate frequency amplifier 114 and 124 according to signal strength indicator RSSI, and then adjusts bandpass signal S
bintensity when frequency mixer 110 and 120 is received.
In order to be described in more detail concept of the present invention, please refer to Fig. 2, Fig. 2 is the schematic diagram of detection signal intensity of the present invention.Bandpass signal S
bafter low noise amplifier 102 adjusting ranges, frequency mixer 110 and 120 is by bandpass signal S
bconvert the intermediate-freuqncy signal S compared with low frequency to
iF, it is divided into homophase intermediate-freuqncy signal S
iFIand quadrature intermediate-freuqncy signal S
iFQ.Bandpass signal S
bfrequency conventionally far above intermediate-freuqncy signal S
iF.Wherein, frequency mixer 110 and 120 can have single-side band modulation (Single-Sideband Modulation, SSB) function.Then frequency mixer 160 and 170 is by homophase intermediate-freuqncy signal S
iFIand quadrature intermediate-freuqncy signal S
iFQconvert homophase high-frequency signal HFS_I and quadrature high-frequency signal HFS_Q to, finally by be combined into a high-frequency signal HFS by adder 154, its centre frequency approaches but is not same as bandpass signal S again
b.That is to say, high-frequency signal HFS is conventionally far above intermediate-freuqncy signal S
iF.The intensity of detecting unit 17 detecting high-frequency signal HFS, and produce accordingly signal strength indicator RSSI, it can be used as the foundation that increases or reduce amplifier gain.
As from the foregoing, radio-frequency (RF) transceiver 10 is by bandpass signal S
bfirst frequency reducing is raising frequency again, to carry out bandpass signal S in high frequency region
bdetecting, the stabilization time of the signal of being detected thus, (Settling Time) was shorter, and (Ripple) is also less for the ripple of signal.In addition, radio-frequency (RF) transceiver 10 is carried out frequency reducing in receiver 15, in reflector 16, carry out raising frequency, its explanation is in the system of a time division multiplexing, the down mixer of the receiver of both having deposited and the up-converter mixer of reflector can be utilized to carry out signal strength signal intensity detecting jointly, such circuit shared mechanism can be exempted extra raising frequency device is set in receiver, to save cost.
In addition, with Fig. 2 for instance, bandpass signal S
bfrequency be 2452 MHz (MHz), frequency mixer 110,120 utilizes the centre frequency fc(of a 2450MHz not produced by local oscillator (being shown in figure)), conversion bandpass signal S
b, and by single-side band modulation function, the high frequency images signal of filtering 4902MHz, leaves the low frequency part of 2MHz, is homophase intermediate-freuqncy signal S
iFIand quadrature intermediate-freuqncy signal S
iFQ.Then, frequency mixer 160 and 170 also utilizes identical centre frequency fc, conversion homophase intermediate-freuqncy signal S
iFIand quadrature intermediate-freuqncy signal S
iFQ, then after adder 154 combination, produce the high-frequency signal HFS of a 2448MHz.In addition, as from the foregoing, by arranging frequency mixer frequency used, the high-frequency signal HFS producing and bandpass signal S
bfrequency can stagger, can not affect the bandpass signal S continuing in received
b.
Please refer to Fig. 3, Fig. 3 is the schematic diagram of the present invention's one signal strength signal intensity detecting flow process 30.Signal strength signal intensity detecting flow process 30 can be used to realize bandpass signal S in radio-frequency (RF) transceiver 10
bintensity detecting, comprise the following step:
Step 300: start.
Step 310: by bandpass signal S
bbe downconverted to intermediate-freuqncy signal S
iF, it comprises homophase intermediate-freuqncy signal S
iFIand quadrature intermediate-freuqncy signal S
iFQ.
Step 320: by homophase intermediate-freuqncy signal S
iFIand quadrature intermediate-freuqncy signal S
iFQraising frequency is to homophase high-frequency signal HFS_I and quadrature high-frequency signal HFS_Q.
Step 330: combination homophase high-frequency signal HFS_I and quadrature high-frequency signal HFS_Q become high-frequency signal HFS.
Step 340: the intensity of detecting high-frequency signal HFS.
Step 350: according to detecting intensity, produce signal strength indicator RSSI.
Step 360: finish.
According to signal strength signal intensity detecting flow process 30, the present invention is by bandpass signal S
bthrough frequency mixer 110,120 frequency reducings, then via after frequency mixer 160 and 170 raising frequencies, produce and bandpass signal S
bthe close but not identical high-frequency signal HFS of frequency, finally can be according to the intensity of the high-frequency signal HFS detecting, produce respective signal strength indicator RSSI to adjust bandpass signal S
bintensity when frequency mixer 110,120 is received, controls to reach the automatic gain of receiver 15.
Please refer to Fig. 4, Fig. 4 is for adopting the schematic diagram of a receiver 40 of signal strength signal intensity detecting concept of the present invention.Receiver 40 is all applicable to time division multiplexing and frequency-division multiplex system, and comprise an antenna 42, one band pass filter 43, one low noise amplifier 402, up-converter mixer 460 and 470, one detecting unit 475 and a demodulating unit 480, and by a down mixer 410, one intermediate-frequency filter 412, one intermediate frequency amplifier 414 and an analog-to-digital converter 416 form the RX path of a signal in-phase component, and by a down mixer 420, one intermediate-frequency filter 422, one intermediate frequency amplifier 424 and an analog-to-digital converter 426 form the RX path of a signal in orthogonal part.In receiver 40, antenna 42 leaches a bandpass signal S via band pass filter 43 after receiving wireless signal
b1it is by down mixer 410 and 420 frequency reducings, and the up-converter mixer 460 high-frequency signal HFS1(corresponding with the rear generation one of 470 raising frequencies is not shown in figure), its in-phase signal is partly HFS1_I, and orthogonal signalling are partly HFS1_Q, finally by detecting unit 47, detected the intensity of high-frequency signal HFS1.Above-mentioned lifting frequency operating principle is similar to Fig. 1 radio-frequency (RF) transceiver 10, therefore describe in detail, please refer to above, in this, repeats no more.Detecting unit 475 is used for detecting by the voltage peak of the signal of up-converter mixer 460 and 470 raising frequencies, and according to detected voltage peak, produces a signal strength indicator RSSI_1.Demodulating unit 480 is used for the digital received signal that demodulation analog-to-digital converter 416,426 is exported.In addition, demodulating unit 480 has automatic gain and adjusts function, and it adjusts low noise amplifier 402 and at least gain of one of intermediate frequency amplifier 414,424 according to signal strength indicator RSSI_1, thus, and bandpass signal S
b1intensity when down mixer 410 and 420 ends are received can constantly be adjusted, and simulates to digital translation mistake avoiding.As from the foregoing, one group of independently up-converter mixer 460 and 470 is set in receiver 40, allows signal down, raising frequency and single-side band modulation all in receiver 40, carry out, be therefore all applicable in the system of a time division multiplexing or frequency division multiplex.
Please refer to Fig. 5, Fig. 5 is for being used for detecting the configuration diagram of a peak sensing circuit 50 of peak value for detecting unit 475.Peak sensing circuit 50 comprises an operational amplifier 472, a transistor 474, a current source 476, a resistance R and a capacitor C, peak sensing circuit 50 is received an input signal SIN by "+" termination of operational amplifier 472, when "+" terminal voltage is greater than "-" terminal voltage to degree, transistor 474 conductings start capacitor C to charge.Afterwards, "-" terminal voltage can raise and draw high along with an output voltage VO UT, and then transistor 474 is closed, after transistor 474 is closed, capacitor C electric discharge, output voltage VO UT reduces, make "-" terminal voltage be pulled low to a certain degree, again turn-on transistor 474 once again thereupon.In order to carry out smoothly signal strength signal intensity detecting, output voltage VO UT need to maintain the peak value of the signal of being detected as far as possible.Under this object, if input signal SIN is a high-frequency signal, peak sensing circuit 50 can adopt less RC constant circuit; Otherwise if input signal SIN is a low frequency signal, peak sensing circuit 50 needs to adopt larger RC constant circuit.In embodiments of the present invention, input signal SIN is Fig. 4 high-frequency signal HFS1, so peak sensing circuit 50 can adopt less, the more not space consuming capacitor of C value.
Please refer to Fig. 6, Fig. 6 is for adopting the second embodiment schematic diagram of a radio-frequency (RF) transceiver 60 of signal strength signal intensity detecting concept of the present invention.Radio-frequency (RF) transceiver 60 be take radio-frequency (RF) transceiver 10 and is made variation as basis, and same components adopts same-sign to represent.In radio-frequency (RF) transceiver 60, bandpass signal S
bpre-enter to a detecting unit 617, detecting unit 617, can also be according to bandpass signal S except possessing the function of Fig. 1 detecting unit 17
bdetecting intensity, judgement bandpass signal S
bwhether need to carry out intensity method for detecting of the present invention and follow-up amplifier gain adjustment.To bandpass signal S
bthe step of raising frequency can be at detecting unit 617 judgement bandpass signal S again in frequency reducing
bin the time of can causing analog-to-digital converter 116,126 conversions to make a mistake, just carry out, radio-frequency (RF) transceiver 60 can be saved power supply thus.
Similarly, please refer to Fig. 7, Fig. 7 is for adopting the second embodiment schematic diagram of a receiver 70 of signal strength signal intensity detecting concept of the present invention.Receiver 70 be take receiver 40 and is made variation as basis, and same components adopts same-sign to represent.In receiver 70, not yet pass through the bandpass signal S of frequency reducing
b1can pre-enter the peak value detector (as peak value detector 470) to a detecting unit 475, it delivers to a demodulating unit 780 by peak sensing result, demodulating unit 780, can also be according to peak sensing result except possessing the function of demodulating unit 480, judgement bandpass signal S
b1whether need to carry out intensity method for detecting of the present invention and follow-up amplifier gain adjustment.
In sum, concept of the present invention is signal to be risen to high frequency band just carry out intensity detecting afterwards, to shorten signal stabilization time and to reduce ripple phenomenon, and then promotes efficiency and the accuracy of intensity detecting.Concept of the present invention is all applicable to time division multiplexing and frequency-division multiplex system.Under time-division multiplex system, concept of the present invention can be utilized the receiver both deposited and the frequency mixer in reflector simultaneously, during reflector does not transmit, by the frequency mixer of reflector by the reception signal of reduced frequency in receiver (as the bandpass signal S of reduced frequency
b) raising frequency.Moreover by suitably selecting the reference frequency (as centre frequency fc) of the lifting frequency of frequency mixer, the embodiment of the present invention can avoid up-conversion signal and primary reception signal to interfere with each other.In addition, under concept of the present invention, signal strength signal intensity circuit for detecting (as Fig. 5 peak value detector 470) can be selected the capacitor that capacitance is less, reduces area and takies.
The foregoing is only the preferred embodiments of the present invention, all equalizations of doing according to the claims in the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (14)
1. a signal strength signal intensity arrangement for detecting, for a communication system, this signal strength signal intensity arrangement for detecting is coupled to a down mixer of this communication system, this down mixer is used for receiving and changes first signal to secondary signal, one frequency of this secondary signal is lower than a frequency of this first signal, and this signal strength signal intensity arrangement for detecting includes:
One up-converter mixer, is used for receiving and changes this secondary signal to one the 3rd signal, and a frequency of the 3rd signal is higher than this frequency of this secondary signal; And
One detecting unit, be used for detecting an intensity of the 3rd signal, and according to a detecting result of this intensity corresponding to the 3rd signal, produce a signal strength indicator to this communication system, wherein this signal strength indicator represents the intensity of this first signal when this down mixer end is received;
Wherein this down mixer is utilized a centre frequency, change this first signal to this secondary signal, and this up-converter mixer is utilized this centre frequency, change this secondary signal to the 3rd signal, wherein this centre frequency is the centre frequency that this first signal corresponding receives signal.
2. signal strength signal intensity arrangement for detecting as claimed in claim 1, wherein this detecting unit comprises:
One amplifier, has a first input end, is used for receiving the 3rd signal, one second input, and an output;
One transistor, has a grid, is coupled to this output, a drain electrode of this amplifier, is coupled to a voltage source, and one source pole, is coupled to this second input;
One current source, is coupled between a ground end and this transistorized this source electrode;
One resistance, has a first end, is coupled to this this transistorized this source electrode and one second end; And
One capacitor, has a first end, is coupled to this ground end, and one second end, is coupled to this second end of this resistance, is used for exporting the peak strength of the 3rd signal.
3. a signal strength signal intensity arrangement for detecting, for a communication system, this communication system comprises a signal receiving circuit and a signal transmission circuit, this signal receiving circuit has a down mixer, this signal transmission circuit has a up-converter mixer, this signal strength signal intensity arrangement for detecting is coupled to a down mixer of this communication system, this down mixer is used for receiving and changes first signal to secondary signal, one frequency of this secondary signal is lower than a frequency of this first signal, and this signal strength signal intensity arrangement for detecting includes:
One up-converter mixer, is used for receiving and changes this secondary signal to one the 3rd signal, and the frequency of the 3rd signal is higher than the frequency of this secondary signal; And
One detecting unit, be used for detecting an intensity of the 3rd signal, and according to a detecting result of this intensity corresponding to the 3rd signal, produce a signal strength indicator to this communication system, wherein the intensity of the 3rd signal represents the intensity of this first signal when this down mixer end is received;
Wherein this down mixer is utilized a centre frequency, change this first signal to this secondary signal, and this up-converter mixer is utilized this centre frequency, change this secondary signal to the 3rd signal, wherein this centre frequency is the centre frequency that this first signal corresponding receives signal.
4. the signal strength signal intensity arrangement for detecting as described in claim 1 or 3, wherein this communication system comprises an automatic gain control circuit, in order to adjust the intensity of this first signal when this down mixer end is received according to this signal strength indicator.
5. the signal strength signal intensity arrangement for detecting as described in claim 1 or 3, wherein this down mixer is separately carried out single-side band modulation to this secondary signal, and this up-converter mixer is separately carried out single-side band modulation to the 3rd signal.
6. a signal strength signal intensity method for detecting, a signal strength signal intensity arrangement for detecting for a communication system, this signal strength signal intensity arrangement for detecting is coupled to a down mixer of this communication system, this down mixer is used for receiving and changes first signal to secondary signal, one frequency of this secondary signal is lower than a frequency of this first signal, and this signal strength signal intensity method for detecting includes:
Receive and change this secondary signal to one the 3rd signal, a frequency of the 3rd signal is higher than this frequency of this secondary signal;
Detect an intensity of the 3rd signal; And
A detecting result according to this intensity corresponding to the 3rd signal, produces a signal strength indicator to this communication system, and wherein this signal strength indicator represents the intensity of this first signal when this down mixer end is received;
Wherein this first signal is converted to this secondary signal according to a centre frequency, and receiving and change this secondary signal comprises and utilizes this centre frequency to the 3rd signal, change this secondary signal to the 3rd signal, wherein this centre frequency is the centre frequency that this first signal corresponding receives signal.
7. signal strength signal intensity method for detecting as claimed in claim 6, it separately comprises this secondary signal and the 3rd signal is carried out to single-side band modulation.
8. for a signal strength signal intensity method for detecting for a communication system, include:
In a signal receiving circuit of this communication system, receive and change first signal to secondary signal, a frequency of this secondary signal is lower than a frequency of this first signal;
In a signal transmission circuit of this communication system, when this communication system does not transmit, receive and change this secondary signal to one the 3rd signal, a frequency of the 3rd signal is higher than this frequency of this secondary signal;
Detect an intensity of the 3rd signal; And
A detecting result according to this intensity corresponding to the 3rd signal, produces a signal strength indicator, wherein this signal strength indicator represent this first signal in this signal receiving circuit the intensity during by frequency reducing;
Wherein receiving and change this first signal to this secondary signal comprises and utilizes a centre frequency, change this first signal to this secondary signal, and receiving and change this secondary signal comprises and utilizes this centre frequency to the 3rd signal, change this secondary signal to the 3rd signal, wherein this centre frequency is the centre frequency that this first signal corresponding receives signal.
9. signal strength signal intensity method for detecting as claimed in claim 8, it separately comprises:
In this signal receiving circuit, this secondary signal is carried out to single-side band modulation; And
In this signal transmission circuit, the 3rd signal is carried out to single-side band modulation.
10. the signal strength signal intensity method for detecting as described in claim 6 or 8, wherein this communication system comprises an automatic gain control circuit, in order to adjust the intensity of this first signal when this down mixer end is received according to this signal strength indicator.
11. 1 kinds of communication systems, comprise a signal receiving circuit and a signal transmission circuit, and this communication system includes:
One down mixer, is contained in this signal receiving circuit, and in order to receive and to change first signal to secondary signal, a frequency of this secondary signal is lower than a frequency of this first signal;
One up-converter mixer, be contained in this signal transmission circuit, and be coupled to this down mixer, be used for when this communication system does not transmit, receive and change this secondary signal to one the 3rd signal, a frequency of the 3rd signal is higher than this frequency of this secondary signal; And
One detecting unit, be coupled to this up-converter mixer, be used for detecting an intensity of the 3rd signal, and according to a detecting result of this intensity corresponding to the 3rd signal, produce a signal strength indicator, wherein this signal strength indicator represents the intensity of this first signal when this down mixer end is received;
Wherein this down mixer is utilized a centre frequency, change this first signal to this secondary signal, and this up-converter mixer is utilized this centre frequency, change this secondary signal to the 3rd signal, wherein this centre frequency is the centre frequency that this first signal corresponding receives signal.
12. communication systems as claimed in claim 11, more comprise an automatic gain control circuit, are coupled to this detecting unit and this down mixer, in order to according to this signal strength indicator, adjust the intensity of this first signal when this down mixer end is received.
13. communication systems as claimed in claim 11, wherein this down mixer is separately carried out single-side band modulation to this secondary signal, and this up-converter mixer is separately carried out single-side band modulation to the 3rd signal.
14. communication systems as claimed in claim 11, wherein this detecting unit comprises:
One amplifier, has a first input end, is used for receiving the 3rd signal, one second input, and an output;
One transistor, has a grid, is coupled to this output, a drain electrode of this amplifier, is coupled to a voltage source, and one source pole, is coupled to this second input;
One current source, is coupled between a ground end and this transistorized this source electrode;
One resistance, has a first end, is coupled to this this transistorized this source electrode and one second end; And
One capacitor, has a first end, is coupled to this ground end, and one second end, is coupled to this second end of this resistance, is used for exporting the peak strength of the 3rd signal.
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| US9692471B2 (en) * | 2015-01-21 | 2017-06-27 | Mediatek Singapore Pte. Ltd. | Wireless receiver with high linearity |
| CN105227207B (en) * | 2015-10-16 | 2018-06-29 | 中国科学院上海高等研究院 | RF transceiver and its signal strength detection processing method |
| CN107238830A (en) * | 2016-03-28 | 2017-10-10 | 瀚谊世界科技股份有限公司 | Wireless device is close to method for detecting |
| TWI660187B (en) * | 2018-06-07 | 2019-05-21 | 立積電子股份有限公司 | Moving object detection circuit and moving object detection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1549446A (en) * | 2003-05-12 | 2004-11-24 | 台扬科技股份有限公司 | Automatic gain control circuit and method |
| CN1553582A (en) * | 2003-06-05 | 2004-12-08 | 中兴通讯股份有限公司 | Calibrating apparatus and method for automatic gain control circuit of array receiver |
| CN1893285A (en) * | 2005-07-06 | 2007-01-10 | 络达科技股份有限公司 | Radio-frequency receiver and radio frequency receiving method |
| TW200820695A (en) * | 2006-06-30 | 2008-05-01 | Gct Semiconductor Inc | Method for compensating transmission carrier leakage and transceiving circuit embodying the same |
-
2010
- 2010-06-29 CN CN201010215127.7A patent/CN102315885B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1549446A (en) * | 2003-05-12 | 2004-11-24 | 台扬科技股份有限公司 | Automatic gain control circuit and method |
| CN1553582A (en) * | 2003-06-05 | 2004-12-08 | 中兴通讯股份有限公司 | Calibrating apparatus and method for automatic gain control circuit of array receiver |
| CN1893285A (en) * | 2005-07-06 | 2007-01-10 | 络达科技股份有限公司 | Radio-frequency receiver and radio frequency receiving method |
| TW200820695A (en) * | 2006-06-30 | 2008-05-01 | Gct Semiconductor Inc | Method for compensating transmission carrier leakage and transceiving circuit embodying the same |
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