TWI427537B - RF tag reader circuit - Google Patents
RF tag reader circuit Download PDFInfo
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- TWI427537B TWI427537B TW99105057A TW99105057A TWI427537B TW I427537 B TWI427537 B TW I427537B TW 99105057 A TW99105057 A TW 99105057A TW 99105057 A TW99105057 A TW 99105057A TW I427537 B TWI427537 B TW I427537B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/06—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers
- H03J7/065—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers the counter or frequency divider being used in a phase locked loop
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
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Description
本發明係關於接收由所謂的標籤所被送訊的資料(訊號)的技術。其中尤其係關於藉由Low-IF方式來接收由主動標籤所被傳送的訊號的射頻(RF)標籤讀取器的收訊電路。The present invention relates to a technique for receiving data (signals) transmitted by a so-called tag. In particular, it relates to a receiving circuit of a radio frequency (RF) tag reader that receives a signal transmitted by an active tag by a Low-IF method.
近年來,以記憶各種資訊的手段而言,已廣泛使用RF型電子標籤(以下稱為RF標籤)。RF標籤係有被動標籤(passive tag)與主動標籤(active tag)。被動標籤並不需要電池,藉由背向散射(backscatter)方式來進行通訊。在背向散射方式中,RF標籤係根據由RF標籤讀取器所被送訊的無調變訊號來接受電力的供給,使無調變訊號的反射量改變,而藉此將所保持的資料送訊至RF標籤讀取器。主動標籤雖然獨自需要電源及振盪器,但是與被動標籤相比較,可進行長距離的通訊。In recent years, RF type electronic tags (hereinafter referred to as RF tags) have been widely used in terms of means for memorizing various information. The RF tag has a passive tag and an active tag. Passive tags do not require a battery and communicate by backscatter. In the backscattering mode, the RF tag receives the supply of power according to the unmodulated signal sent by the RF tag reader, so that the amount of reflection of the unmodulated signal is changed, thereby maintaining the retained data. Send to the RF tag reader. Active tags, although they require a power supply and an oscillator alone, can communicate over long distances compared to passive tags.
此外,RF標籤讀取器在與被動標籤的通訊中,必須一面傳送無調變波,一面接收資料。因此,在與被動標籤的通訊中,很多情形係採用可利用與送訊至被動標籤的無調變波為相同的頻率作為本局訊號頻率的直接轉換方式。另一方面,在與主動標籤的通訊中,由於不需要同時進行收送訊,因此很多情形係採用收訊性能高的Low-IF方式。例如,在下述非專利文獻1中係揭示一種採用Low-IF方式的RFIC的構成。In addition, in the communication with the passive tag, the RF tag reader must transmit the unmodulated wave while receiving the data. Therefore, in the communication with the passive tag, in many cases, the same frequency as the unmodulated wave sent to the passive tag can be used as the direct conversion mode of the local signal frequency. On the other hand, in the communication with the active tag, since it is not necessary to perform the simultaneous transmission and reception, many cases adopt the Low-IF method with high reception performance. For example, in the following Non-Patent Document 1, a configuration of an RFIC using a Low-IF method is disclosed.
[非專利文獻1]J. Crols,et al.,"Low-IF Topologies for High-Performance Analog Front Ends of Fully Integrated Receivers",IEEE Transactions on Circuits and Systems II,Vol.45,No.3,pp.269-282,March 1998.[Non-Patent Document 1] J. Crols, et al., "Low-IF Topologies for High-Performance Analog Front Ends of Fully Integrated Receivers", IEEE Transactions on Circuits and Systems II, Vol. 45, No. 3, pp. 269-282, March 1998.
但是,被動標籤係藉由反射來自RF標籤讀取器的無調變波,來傳送將資料保持在內部的資料,因此不會有由RF標籤讀取器所被送訊的無調變波的頻率偏移的情形。但是,主動標籤係與RF標籤讀取器獨立而另外具有振盪器,因此由主動標籤所被送訊的訊號的頻率會有與RF標籤讀取器假想收訊的訊號的頻率偏移的情形。若兩頻率偏移,會造成RF標籤讀取器中的收訊特性劣化。However, the passive tag transmits the data holding the data internally by reflecting the unmodulated wave from the RF tag reader, so there is no untuned wave that is transmitted by the RF tag reader. The case of frequency offset. However, the active tag is independent of the RF tag reader and additionally has an oscillator, so the frequency of the signal transmitted by the active tag may be offset from the frequency of the signal that the RF tag reader imaginarily receives. If the two frequencies are offset, the reception characteristics in the RF tag reader are degraded.
本發明係鑑於上述情形而研創者,本發明之目的係在由主動標籤所被送訊的電波收訊中改善收訊特性。The present invention has been made in view of the above circumstances, and an object of the present invention is to improve reception characteristics in radio wave reception by an active tag.
為了解決上述課題,在本發明中係根據來自主動標籤的無調變訊號,來調節RF標籤讀取器之本局訊號頻率或帶通濾波器的中心頻率。In order to solve the above problems, in the present invention, the local signal frequency of the RF tag reader or the center frequency of the band pass filter is adjusted based on the unmodulated signal from the active tag.
例如,本發明之第一態樣係一種射頻標籤讀取器電路,係藉由Low-IF方式來接收由主動標籤所被送訊的訊號的射頻(RF)標籤讀取器的收訊電路,其特徵為具備有:對由基準振盪器所被輸出的訊號,輸出所被設定之分頻比的本局訊號的可程式化PLL;將由主動標籤所被送訊的無調變訊號,使用由前述可程式化PLL所被輸出的本局訊號進行下轉換(down-converting)的混頻器;由來自前述混頻器的輸出訊號之中,使預先訂定的頻帶的訊號通過的帶通濾波器;將帶通濾波器的輸出訊號加以放大的放大器;在將前述放大器的輸出轉換成數位資料之後進行解調的解調部;計算出表示來自前述帶通濾波器之輸出訊號的頻率、與預先訂定的基準頻率的差分的頻率差的頻率差計算部;及計算出與藉由前述頻率差計算部所計算出的差分相對應的分頻比,將所計算出的分頻比設定在前述可程式化PLL的分頻比控制部。For example, the first aspect of the present invention is a radio frequency tag reader circuit, which is a receiving circuit of a radio frequency (RF) tag reader that receives a signal transmitted by an active tag by a Low-IF method. The utility model is characterized in that: a programmable PLL for outputting a local frequency signal of a frequency division ratio set by a signal outputted by a reference oscillator; and a non-modulation signal to be transmitted by the active label is used by the foregoing a mixer that can be programmed to down-convert the local signal output by the PLL; a band pass filter that passes a signal of a predetermined frequency band among the output signals from the mixer; An amplifier that amplifies an output signal of the band pass filter; a demodulation unit that performs demodulation after converting the output of the amplifier into digital data; calculates a frequency indicating an output signal from the band pass filter, and pre-orders a frequency difference calculation unit for determining a frequency difference of the difference between the reference frequencies; and calculating a frequency division ratio corresponding to the difference calculated by the frequency difference calculation unit, and setting the calculated frequency division ratio Programmable PLL frequency-division ratio control unit.
此外,本發明之第二態樣係一種射頻標籤讀取器電路,係藉由Low-IF方式來接收由主動標籤所被送訊的訊號的射頻(RF)標籤讀取器的收訊電路,其特徵為具備有:輸出預先訂定的頻率的本局訊號的本局訊號生成部;將由主動標籤所被送訊的無調變訊號,使用由前述本局訊號生成部所被輸出的本局訊號進行下轉換(down-converting)的混頻器;在與所被輸入的控制訊號相對應的中心頻率中,由來自前述混頻器的輸出訊號之中,使預先訂定的頻帶寬的訊號通過的帶通濾波器;將帶通濾波器的輸出訊號放大的放大器;在將前述放大器的輸出轉換成數位資料之後進行解調的解調部;計算出來自前述帶通濾波器之輸出訊號的頻率、與預先訂定的基準頻率的差分的頻率差計算部;及按照藉由前述頻率差計算部所計算出的差分,生成用以控制前述帶通濾波器之頻帶的中心頻率的控制訊號而供給至前述帶通濾波器的帶通濾波器控制部。In addition, the second aspect of the present invention is a radio frequency tag reader circuit, which is a receiving circuit of a radio frequency (RF) tag reader that receives a signal transmitted by an active tag by a Low-IF method. The present invention is characterized in that: the local signal generating unit that outputs the local signal of the preset frequency; and the unmodulated signal sent by the active tag is down-converted using the local signal output by the local signal generating unit. (down-converting) mixer; in the center frequency corresponding to the input control signal, a band pass of a signal of a predetermined frequency band is passed among the output signals from the mixer a filter; an amplifier that amplifies an output signal of the band pass filter; a demodulation unit that demodulates the output of the amplifier after converting the output of the amplifier; calculates a frequency of the output signal from the band pass filter, and a frequency difference calculation unit that sets a difference between the reference frequency; and a center frequency for controlling a frequency band of the band pass filter according to the difference calculated by the frequency difference calculation unit The control signal is supplied to the band pass filter of the band-pass filter control unit.
藉由本發明之RF標籤讀取器電路,在由主動標籤所被送訊的電波的收訊中,可改善收訊特性。With the RF tag reader circuit of the present invention, the reception characteristics can be improved in the reception of radio waves transmitted by the active tag.
首先針對本發明之第1實施形態加以說明。First, a first embodiment of the present invention will be described.
第1圖係顯示本發明之一實施形態之RFID系統10之一例的系統構成圖。RFID系統10係具備有:主動標籤11、資料處理裝置12、及RF標籤讀取器20。Fig. 1 is a system configuration diagram showing an example of an RFID system 10 according to an embodiment of the present invention. The RFID system 10 includes an active tag 11, a data processing device 12, and an RF tag reader 20.
在本實施形態中,主動標籤11係當接收到來自RF標籤讀取器20的Wake UP訊息時,例如第2圖所示,傳送包含無調變波(CW)30、引導音(pilot tone)31、前序訊號(preamble)32、及資料33的訊息。In the present embodiment, when the active tag 11 receives the Wake UP message from the RF tag reader 20, for example, as shown in FIG. 2, the transmission includes the unmodulated wave (CW) 30 and the pilot tone. 31. Messages of preamble 32 and data 33.
在RF標籤讀取器20設有開關13,使用者在接收來自主動標籤11的資料時,即按下該開關13。若開關13被按下時,本實施形態之RF標籤讀取器20係傳送Wake UP訊息,之後根據由主動標籤11所被送訊的無調變波,來調節由主動標籤11所被送訊的電波解調所使用的本局訊號的頻率。接著,RF標籤讀取器20係將繼無調變波之後所被送訊的引導音、前序訊號、及資料進行解調,且將解調後的資料傳送至資料處理裝置12。A switch 13 is provided in the RF tag reader 20, and the user presses the switch 13 when receiving data from the active tag 11. When the switch 13 is pressed, the RF tag reader 20 of the present embodiment transmits a Wake UP message, and then adjusts the message transmitted by the active tag 11 based on the unmodulated wave transmitted by the active tag 11. The frequency of the local signal used by the radio wave demodulation. Next, the RF tag reader 20 demodulates the pilot tone, preamble signal, and data transmitted after the unmodulated wave, and transmits the demodulated data to the data processing device 12.
第3圖係顯示第1實施形態中之RF標籤讀取器20之功能構成之一例的方塊圖。RF標籤讀取器20係具有:天線200、LNA(Low Noise Amplifier,低雜訊放大器)201、混頻器202、混頻器203、BPF(Band Pass Filter,帶通濾波器)204、BPF205、AGC(Automatic Gain Control,自動增益控制)放大器206、AGC放大器207、ADC(Analog to Digital converter,類比至數位轉換器)208、ADC209、LPF(Low Pass Filter,低通濾波器)210、LPF211、解調器212、移相器213、PLL(Phase Locked Loop,鎖相迴路)214、分頻比控制部215、Δf計算部216、及控制部217。Fig. 3 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the first embodiment. The RF tag reader 20 includes an antenna 200, an LNA (Low Noise Amplifier) 201, a mixer 202, a mixer 203, a BPF (Band Pass Filter) 204, and a BPF 205. AGC (Automatic Gain Control) amplifier 206, AGC amplifier 207, ADC (Analog to Digital converter) 208, ADC 209, LPF (Low Pass Filter) 210, LPF 211, solution The modulator 212, the phase shifter 213, the PLL (Phase Locked Loop) 214, the frequency division ratio control unit 215, the Δf calculation unit 216, and the control unit 217.
PLL214係由水晶振動子等的基準訊號源,生成藉由分頻比控制部215或控制部217所被設定的分頻比的本局訊號,將所生成的本局訊號供給至混頻器202,並且透過移相器213而供給至混頻器203。在本實施形態中,RF標籤讀取器20由於以Low-IF方式來接收來自主動標籤11的訊號,因此PLL214所生成的本局訊號係由應由主動標籤11所被送訊的訊號的頻率偏移預先訂定的頻率份(例如100kHz)。The PLL 214 generates a local signal of a frequency division ratio set by the frequency division ratio control unit 215 or the control unit 217 by a reference signal source such as a crystal vibrator, and supplies the generated local signal to the mixer 202, and It is supplied to the mixer 203 through the phase shifter 213. In the present embodiment, since the RF tag reader 20 receives the signal from the active tag 11 in the Low-IF mode, the local signal generated by the PLL 214 is offset by the frequency of the signal to be transmitted by the active tag 11. Move a predetermined frequency share (for example, 100 kHz).
LNA201係透過天線200,將由主動標籤11所接收到的訊號予以放大而供給至混頻器202及混頻器203。混頻器202係藉由乘算由PLL214所被供給的本局訊號,將由LNA201所被供給的訊號進行下轉換(down-converting)而將收訊訊號的I成分供給至BPF204。混頻器202係將藉由移相器213偏移π/2的本局訊號作乘算,藉此將由LNA201所被供給的訊號進行下轉換而將收訊訊號的Q成分供給至BPF205。The LNA 201 transmits the signal received by the active tag 11 through the antenna 200, and supplies it to the mixer 202 and the mixer 203. The mixer 202 supplies the I component of the received signal to the BPF 204 by down-converting the signal supplied from the LNA 201 by multiplying the local signal supplied from the PLL 214. The mixer 202 multiplies the local signal shifted by π/2 by the phase shifter 213, thereby down-converting the signal supplied from the LNA 201 to supply the Q component of the received signal to the BPF 205.
BPF204係由從混頻器202所被供給的訊號之中,使預先訂定的頻帶的頻率成分通過。BPF205係由從混頻器203所被供給的訊號之中,使預先訂定的頻帶的頻率成分通過。The BPF 204 passes the frequency components of the predetermined frequency band among the signals supplied from the mixer 202. The BPF 205 passes the frequency components of the predetermined frequency band among the signals supplied from the mixer 203.
由BPF204所被輸出的1成分的收訊訊號係藉由AGC放大器206予以放大,藉由ADC208被轉換成數位訊號,在藉由LPF210而被去除諧波之後,被供給至解調器212。由BPF205所被輸出的Q成分的收訊訊號係藉由AGC放大器207予以放大,藉由ADC209被轉換成數位訊號,在藉由LPF211而被去除諧波之後,被供給至解調器212。解調器212係根據I成分及Q成分的收訊訊號將資料位元進行解調,且將經解調的資料位元供給至資料處理裝置12。The received signal of the one component outputted by the BPF 204 is amplified by the AGC amplifier 206, converted into a digital signal by the ADC 208, and is removed from the harmonics by the LPF 210, and then supplied to the demodulator 212. The received signal of the Q component outputted by the BPF 205 is amplified by the AGC amplifier 207, converted into a digital signal by the ADC 209, and is removed from the harmonics by the LPF 211, and then supplied to the demodulator 212. The demodulator 212 demodulates the data bits based on the received signals of the I component and the Q component, and supplies the demodulated data bits to the data processing device 12.
Δf計算部216係當由控制部217被指示時,計算出收訊訊號的頻率與預先訂定的頻率的頻率差Δf,將所計算出的Δf的值供給至分頻比控制部215。在本實施形態中,Δf計算部216係監視收訊訊號的Q成分,在預先訂定的時間間隔Tc中,將收訊訊號之1波長的反覆次數α進行計數。接著,Δf計算部216係根據與在預先訂定的頻率的訊號中所應被計數的1波長的反覆次數β的差分,計算出(α-β)÷Tc作為Δf。When the control unit 217 is instructed, the Δf calculating unit 216 calculates the frequency difference Δf between the frequency of the received signal and the predetermined frequency, and supplies the calculated value of Δf to the frequency dividing ratio control unit 215. In the present embodiment, the Δf calculating unit 216 monitors the Q component of the received signal, and counts the number of times of repetition of the first wavelength of the received signal in the predetermined time interval Tc. Next, the Δf calculating unit 216 calculates (α - β) ÷ Tc as Δf based on the difference from the number of times of repetition of the one wavelength to be counted in the signal of the frequency set in advance.
其中,在本實施形態中,Δf計算部216係根據收訊訊號的Q成分來計算出Δf的值,但是亦可根據收訊訊號的I成分來計算出Δf的值。此外,Δf計算部216係亦可例如第4圖所示,在預先訂定的時間間隔Tc中,將收訊訊號之峰值數設為1波長的反覆次數α而進行計數。In the present embodiment, the Δf calculating unit 216 calculates the value of Δf based on the Q component of the received signal, but may calculate the value of Δf based on the I component of the received signal. Further, for example, as shown in FIG. 4, the Δf calculating unit 216 may count the number of peaks of the received signal at the predetermined time interval Tc by the number of times of repetition of the one wavelength.
其中,以其他形態而言,Δf計算部216亦可使用收訊訊號的I成分與Q成分,藉由類比PLL或數位PLL來計算出頻率差Δf。第5圖係顯示藉由數位PLL來構成Δf計算部216時之例。However, in another aspect, the Δf calculating unit 216 may calculate the frequency difference Δf by the analog PLL or the digital PLL by using the I component and the Q component of the received signal. Fig. 5 shows an example in which the Δf calculating unit 216 is constructed by a digital PLL.
第5圖中,在相位比較器40中,係在由LPF210所被輸出的I成分的收訊訊號藉由乘算器41將Cosine波作乘算,在由LPF211所被輸出的Q成分的收訊訊號藉由乘算器42將Sine波作乘算而藉由反相器44予以反轉,乘算器41的輸出與反相器44的輸出係利用加算器43進行加算且予以輸出。In Fig. 5, in the phase comparator 40, the Cosine wave is multiplied by the multiplier 41 of the I component output signal outputted by the LPF 210, and the Q component outputted by the LPF 211 is received. The signal number is multiplied by the multiplier 42 and inverted by the inverter 44. The output of the multiplier 41 and the output of the inverter 44 are added by the adder 43 and output.
由相位比較器40所被輸出的訊號係在通過迴路濾波器45之後,作為頻率差Δf而被輸出至分頻比控制部215。此外,來自迴路濾波器45的輸出係在NCO(numeric controlled oscillator,數控振盪器)46中,藉由加算器47加算表示預先訂定的頻率的基準值,藉由積分器48予以積分且被反饋至相位比較器40。其中,所謂基準值係表示根據假設由主動標籤11所被送訊的訊號的頻率、與RF標籤讀取器20所假想的收訊訊號的頻率不具差異時的混頻器202及混頻器203所被輸出的訊號的中間頻率的數位值。The signal output from the phase comparator 40 is output to the frequency division ratio control unit 215 as a frequency difference Δf after passing through the loop filter 45. In addition, the output from the loop filter 45 is in an NCO (numeric controlled oscillator) 46, and a reference value indicating a predetermined frequency is added by the adder 47, which is integrated by the integrator 48 and fed back. To phase comparator 40. Here, the reference value indicates the mixer 202 and the mixer 203 when the frequency of the signal transmitted by the active tag 11 is not different from the frequency of the imaginary received signal of the RF tag reader 20. The digit value of the intermediate frequency of the signal being output.
在此,若將由LPF210或LPF211所被輸出的訊號頻率設為ωS /2π、預先訂定的中間頻率設為ωIF /2π時,可藉由下述計算式(1),計算出頻率差Δf(=(ωS -ωIF )/2π)。Here, if the signal frequency output by the LPF 210 or the LPF 211 is ω S /2π and the predetermined intermediate frequency is ω IF /2π, the frequency difference can be calculated by the following calculation formula (1). Δf(=(ω S -ω IF )/2π).
PLL214係例如第6圖所示,具有:相位比較器60、充電泵61、迴路濾波器62、VCO(voltage controlled oscillator,壓控振盪器)63、及可變分頻器64。可變分頻器64係在將VCO63的輸出訊號的頻率設為fVCO 、可變分頻器64的輸出訊號的頻率設為fOUT 時,根據屬於由分頻比控制部215所被供給的分頻比的設定值的參數A、參數B、及參數N,輸出按照下述計算式(2)的頻率fOUT 的訊號。The PLL 214 includes, as shown in FIG. 6, a phase comparator 60, a charge pump 61, a loop filter 62, a VCO (voltage controlled oscillator) 63, and a variable frequency divider 64. The variable frequency divider 64 is provided by the frequency division ratio control unit 215 when the frequency of the output signal of the VCO 63 is f VCO and the frequency of the output signal of the variable frequency divider 64 is f OUT . frequency division ratio set value of parameter a, parameter B, and the parameter N, the output is calculated according to the following formula (2) frequency f OUT signal.
ff OUTOUT =(=( AA ×× NN ++ BB )) ff VCOVCO …(2) …(2)
相位比較器60係輸出與來自基準訊號源的基準訊號和來自可變分頻器64的fOUT 的相位差相對應的訊號,充電泵61係將來自相位比較器60的訊號轉換成電壓。迴路濾波器62係將充電泵61的輸出電壓平均化,VCO63係將與迴路濾波器62的輸出電壓相對應的頻率的訊號進行輸出。其中,在本實施形態中,係以整數分頻器作為可變分頻器64為例加以說明,但是PLL214亦可構成為使用分頻器作為可變分頻器64的分數型PLL(fractional PLL)。Train output of the phase comparator 60 with the reference signal from the reference source and the phase difference signal from the variable frequency divider 64 is f OUT signal corresponding to the charge pump 61 to the signal line 60 from the phase comparator into a voltage. The loop filter 62 averages the output voltage of the charge pump 61, and the VCO 63 outputs a signal of a frequency corresponding to the output voltage of the loop filter 62. In the present embodiment, an integer frequency divider is used as the variable frequency divider 64 as an example. However, the PLL 214 may be configured as a fractional PLL (fractional PLL) using a frequency divider as the variable frequency divider 64. ).
分頻比控制部215係例如第7圖所示具有分頻比表格50及分頻比設定部51。在分頻比表格50係例如第8圖所示,與頻率差500產生對應而預先儲存有應設定在PLL214之各參數的值501。分頻比表格50內的各參數的值501當藉由Δf計算部216計算出相對應的頻率差時,為了生成將該頻率差設為0的本局訊號頻率而應設定在PLL214的值,藉由製造者等利用實驗預先進行測定且予以儲存。The frequency division ratio control unit 215 has a frequency division ratio table 50 and a frequency division ratio setting unit 51 as shown in FIG. 7, for example. In the frequency division ratio table 50, for example, as shown in FIG. 8, a value 501 corresponding to each parameter to be set in the PLL 214 is stored in advance in correspondence with the frequency difference 500. When the value 501 of each parameter in the frequency division ratio table 50 is calculated by the Δf calculation unit 216, the value of the PLL 214 should be set in order to generate the local signal frequency with the frequency difference set to 0. The measurement is performed in advance by a manufacturer or the like using an experiment and stored.
分頻比設定部51係當由Δf計算部216接收到表示頻率差Δf的訊號時,由分頻比表格50抽出與所接收到的頻率差Δf相對應的分頻比的各參數,且將所抽出的各參數設定在PLL214的可變分頻器64。When the Δf calculating unit 216 receives the signal indicating the frequency difference Δf, the frequency dividing ratio setting unit 51 extracts each parameter of the frequency dividing ratio corresponding to the received frequency difference Δf from the frequency dividing ratio table 50, and The extracted parameters are set to the variable frequency divider 64 of the PLL 214.
在此,藉由主動標籤11內的基準訊號、與RF標籤讀取器20內的基準訊號的偏移,若由主動標籤11所被送訊的訊號的頻率、與RF標籤讀取器20所假想的收訊訊號的頻率偏移預先訂定的頻率份以上,或者頻率的偏移量未達預先訂定的頻率時,以藉由Low-IF方式所為之收訊,會有藉由混頻器202及混頻器203予以下轉換的訊號的頻率分別由BPF204及BPF205的通頻帶脫離的情形。Here, by the offset between the reference signal in the active tag 11 and the reference signal in the RF tag reader 20, if the frequency of the signal transmitted by the active tag 11 is the same as that of the RF tag reader 20 If the frequency of the imaginary received signal is shifted by more than the predetermined frequency, or if the offset of the frequency is less than the predetermined frequency, the signal is transmitted by the Low-IF method, and the frequency is mixed. The frequency of the down-converted signal by the 202 and the mixer 203 is separated from the passband of the BPF 204 and the BPF 205, respectively.
由BPF204及BPF205的通頻帶脫離的訊號並未被供給至AGC放大器206及AGC放大器207以後,因此解調器212無法直接將來自主動標籤11的訊號正確地進行解調。Since the signal from the passband of the BPF 204 and the BPF 205 is not supplied to the AGC amplifier 206 and the AGC amplifier 207, the demodulator 212 cannot directly demodulate the signal from the active tag 11.
相對於此,分頻比控制部215係按照藉由Δf計算部216所被計算出的頻率差Δf,將藉由PLL214所得之本局訊號的頻率,以成為由主動標籤11的訊號頻率偏移預先訂定的頻率份的頻率的方式進行設定。藉此,藉由混頻器202及混頻器203予以下轉換的訊號的頻率不會分別由BPF204及BPF205的通頻帶脫離,而被供給至AGC放大器206及AGC放大器207以後。On the other hand, the frequency division ratio control unit 215 changes the frequency of the local signal obtained by the PLL 214 to the signal frequency offset of the active tag 11 in accordance with the frequency difference Δf calculated by the Δf calculating unit 216. Set the frequency of the specified frequency share. Thereby, the frequency of the signal down-converted by the mixer 202 and the mixer 203 is not separated from the pass band of the BPF 204 and the BPF 205, and is supplied to the AGC amplifier 206 and the AGC amplifier 207.
因此,本實施形態之RF標籤讀取器20即使在主動標籤11內的基準訊號、與RF標籤讀取器20內的基準訊號發生偏移的情形下,亦可將來自主動標籤11的訊號正確地進行解調。Therefore, the RF tag reader 20 of the present embodiment can correct the signal from the active tag 11 even when the reference signal in the active tag 11 is offset from the reference signal in the RF tag reader 20. Demodulation is performed.
接著,一面參照第9圖之流程圖,一面說明控制部217之動作。第9圖係顯示第1實施形態中之RF標籤讀取器20之動作之一例的流程圖。當透過被設在RF標籤讀取器20的開關13,由使用者被指示來自主動標籤11之資料的收訊時,RF標籤讀取器20即開始本流程圖所示動作。Next, the operation of the control unit 217 will be described with reference to the flowchart of Fig. 9. Fig. 9 is a flow chart showing an example of the operation of the RF tag reader 20 in the first embodiment. When the user receives the reception of the material from the active tag 11 through the switch 13 provided in the RF tag reader 20, the RF tag reader 20 starts the operation shown in this flowchart.
首先,控制部217係在PLL214設定分頻比的初始值(S100),藉由未圖示的送訊機,傳送Wake UP訊息。接著,控制部217進行判定是否由LPF211被輸出無調變訊號(S101)。無調變訊號未被輸出時(S101:No),控制部217係反覆步驟S101至無調變訊號被輸出為止。First, the control unit 217 sets an initial value of the frequency division ratio in the PLL 214 (S100), and transmits a Wake UP message by a transmitter (not shown). Next, the control unit 217 determines whether or not the unmodulated signal is output by the LPF 211 (S101). When the no-modulation signal is not output (S101: No), the control unit 217 repeats the step S101 until the no-modulation signal is output.
當無調變訊號被輸出時(S101:Yes),控制部217係使分頻比控制部215及Δf計算部216起動(S102),至藉由Δf計算部216所為之頻率差Δf的計算、藉由分頻比控制部215所為之分頻比的設定、及藉由PLL214所為之本局訊號頻率的切換結束為止的期間,待機預定時間(例如數十μ秒)。When the unmodulated signal is output (S101: Yes), the control unit 217 activates the frequency division ratio control unit 215 and the Δf calculation unit 216 (S102), and calculates the frequency difference Δf by the Δf calculation unit 216. The predetermined time (for example, several tens of μs) is reserved by the setting of the frequency division ratio by the frequency division ratio control unit 215 and the period until the switching of the local signal frequency by the PLL 214 is completed.
Δf計算部216係進行計算收訊訊號的頻率與預先訂定的頻率的頻率差Δf,將所計算出的Δf值供給至分頻比控制部215。PLL214係由分頻比表格50中抽出與由Δf計算部216所接收到的頻率差Δf相對應的分頻比的各參數,且將所抽出的各參數設定在PLL214的可變分頻器64(S103)。The Δf calculating unit 216 performs a frequency difference Δf between the frequency at which the received signal is calculated and a predetermined frequency, and supplies the calculated Δf value to the frequency dividing ratio control unit 215. The PLL 214 extracts each parameter of the frequency division ratio corresponding to the frequency difference Δf received by the Δf calculation unit 216 from the frequency division ratio table 50, and sets the extracted parameters to the variable frequency divider 64 of the PLL 214. (S103).
接著,控制部217係使分頻比控制部215及Δf計算部216停止(S104)。接著,PLL214係以在步驟S103中藉由分頻比控制部215所被設定的分頻比繼續進行動作,解調器212係將由主動標籤11繼無調變波所被送訊的資料進行解調(S105),RF標籤讀取器20係結束本流程圖所示之動作。Next, the control unit 217 stops the frequency division ratio control unit 215 and the Δf calculation unit 216 (S104). Next, the PLL 214 continues to operate by the frequency division ratio set by the frequency division ratio control unit 215 in step S103, and the demodulator 212 decodes the data transmitted by the active tag 11 following the unmodulated wave. To adjust (S105), the RF tag reader 20 ends the operation shown in this flowchart.
以上針對本發明之第1實施形態加以說明。The first embodiment of the present invention has been described above.
由上述說明可知,藉由本實施形態之RF標籤讀取器20,在由主動標籤11所傳送的電波的收訊中,可改善收訊特性。As apparent from the above description, the RF tag reader 20 of the present embodiment can improve the reception characteristics in the reception of radio waves transmitted by the active tag 11.
接著,針對本發明之第2實施形態加以說明。Next, a second embodiment of the present invention will be described.
第10圖係顯示第2實施形態中之RF標籤讀取器20之功能構成之一例的方塊圖。本實施形態之RF標籤讀取器20係具有:天線200、LNA201、混頻器202、混頻器203、BPF204、BPF205、AGC放大器206、AGC放大器207、ADC208、ADC209、LPF210、LPF211、解調器212、移相器213、PLL214、分頻比控制部215、Δf計算部216、控制部217、開關220、開關221、LPF222、及LPF223。Fig. 10 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the second embodiment. The RF tag reader 20 of the present embodiment includes an antenna 200, an LNA 201, a mixer 202, a mixer 203, a BPF 204, a BPF 205, an AGC amplifier 206, an AGC amplifier 207, an ADC 208, an ADC 209, an LPF 210, an LPF 211, and demodulation. The device 212, the phase shifter 213, the PLL 214, the frequency division ratio control unit 215, the Δf calculation unit 216, the control unit 217, the switch 220, the switch 221, the LPF 222, and the LPF 223.
本實施形態中之RF標籤讀取器20具有開關220、開關221、LPF222、及LPF223,此點與使用第3圖所說明的第1實施形態中之RF標籤讀取器20不同。其中,除了以下說明的內容以外,在第10圖中,標註與第3圖相同元件符號的構件係具有與第3圖中的構件為相同或同樣的功能,故省略說明。The RF tag reader 20 in the present embodiment has the switch 220, the switch 221, the LPF 222, and the LPF 223, which is different from the RF tag reader 20 in the first embodiment described with reference to Fig. 3. In addition, in the tenth figure, the member which has the same code|symbol is attached|subjected by FIG. 3, and has the same or the same function as the member of FIG. 3, and the description is abbreviate|omitted.
開關220係按照來自控制部217的指示,將混頻器202的輸出訊號傳送至LPF222或BPF204。開關221係按照來自控制部217的指示,將混頻器203的輸出訊號傳送至LPF223或BPF205。The switch 220 transmits the output signal of the mixer 202 to the LPF 222 or the BPF 204 in accordance with an instruction from the control unit 217. The switch 221 transmits the output signal of the mixer 203 to the LPF 223 or the BPF 205 in accordance with an instruction from the control unit 217.
LPF222係由透過開關220所被提供的訊號之中,抽出預定頻率以下之頻帶的訊號且供給至AGC放大器206。LPF223係由透過開關221所被提供的訊號之中,將預定頻率以下的頻帶的訊號抽出而供給至AGC放大器207。The LPF 222 extracts a signal of a frequency band below a predetermined frequency from among signals supplied from the switch 220 and supplies it to the AGC amplifier 206. The LPF 223 extracts a signal of a frequency band equal to or lower than a predetermined frequency from the signal supplied from the transmission switch 221, and supplies it to the AGC amplifier 207.
接著,一面參照第11圖之流程圖,一面說明本實施形態中之控制部217之動作。第11圖係顯示第2實施形態中之RF標籤讀取器20之動作之一例的流程圖。在本實施形態中,被設在RF標籤讀取器20的開關13係可對RF標籤讀取器20指示主動標籤的收訊或被動標籤的收訊的任一者。RF標籤讀取器20係當開關13被操作時,即開始本流程圖所示動作。Next, the operation of the control unit 217 in the present embodiment will be described with reference to the flowchart of Fig. 11. Fig. 11 is a flow chart showing an example of the operation of the RF tag reader 20 in the second embodiment. In the present embodiment, the switch 13 provided in the RF tag reader 20 can instruct the RF tag reader 20 to indicate either the reception of the active tag or the reception of the passive tag. The RF tag reader 20 starts the operation shown in this flowchart when the switch 13 is operated.
首先,控制部217係判定使用者透過開關13所為的操作是否為指示主動標籤之收訊者(S200)。若由使用者被指示主動標籤的收訊時(S200:Yes),控制部217係以將混頻器202的輸出訊號送至BPF204的方式將開關220作切換,並且以將混頻器203的輸出訊號送至BPF205的方式將開關221作切換(S201)。First, the control unit 217 determines whether or not the operation by the user through the switch 13 is a receiver indicating the active tag (S200). When the user is instructed to receive the reception of the active tag (S200: Yes), the control unit 217 switches the switch 220 by sending the output signal of the mixer 202 to the BPF 204, and the mixer 203 is switched. The way in which the output signal is sent to the BPF 205 switches the switch 221 (S201).
接著,控制部217係將用以生成Low-IF方式之收訊中的本局訊號頻率的分頻比的初始值設定在PLL214(S202),藉由未圖示的送訊機,傳送Wake UP訊息。接著,控制部217係判定是否由LPF211被輸出有無調變訊號(S203)。若無調變訊號未被輸出時(S203:No),控制部217係反覆步驟S203至無調變訊號被輸出為止。Next, the control unit 217 sets an initial value of the frequency division ratio of the local signal frequency in the reception of the Low-IF mode reception to the PLL 214 (S202), and transmits the Wake UP message by a transmitter (not shown). . Next, the control unit 217 determines whether or not the presence or absence of the modulation signal is outputted by the LPF 211 (S203). When the no-modulation signal is not output (S203: No), the control unit 217 repeats the step S203 until the no-modulation signal is output.
若無調變訊號被輸出時(S203:Yes),控制部217係使分頻比控制部215及Δf計算部216起動(S204),至藉由Δf計算部216所為之頻率差Δf的計算、藉由分頻比控制部215所為之分頻比的設定、及藉由PLL214所為之本局訊號頻率的切換結束為止的期間,待機預定時間(例如數十μ秒)。When the no-modulation signal is output (S203: Yes), the control unit 217 activates the frequency division ratio control unit 215 and the Δf calculation unit 216 (S204), and calculates the frequency difference Δf by the Δf calculation unit 216. The predetermined time (for example, several tens of μs) is reserved by the setting of the frequency division ratio by the frequency division ratio control unit 215 and the period until the switching of the local signal frequency by the PLL 214 is completed.
Δf計算部216係計算出收訊訊號的頻率與預先訂定的頻率的頻率差Δf,且將計算出的Δf值供給至分頻比控制部215。分頻比控制部215係由分頻比表格50抽出與由Δf計算部216所接收到的頻率差Δf相對應的分頻比的各參數,將所抽出的各參數設定在PLL214的可變分頻器64(S205)。The Δf calculating unit 216 calculates the frequency difference Δf between the frequency of the received signal and the predetermined frequency, and supplies the calculated Δf value to the frequency dividing ratio control unit 215. The frequency division ratio control unit 215 extracts each parameter of the frequency division ratio corresponding to the frequency difference Δf received by the Δf calculation unit 216 by the frequency division ratio table 50, and sets each of the extracted parameters to the variable value of the PLL 214. The frequency converter 64 (S205).
接著,控制部217係使分頻比控制部215及Δf計算部216停止(S206)。接著,PLL214係以在步驟S205中藉由分頻比控制部215所被設定的分頻比繼續進行動作,解調器212係將由主動標籤11繼無調變波所被送訊的資料進行解調(S207),RF標籤讀取器20即結束本流程圖所示動作。Next, the control unit 217 stops the frequency division ratio control unit 215 and the Δf calculation unit 216 (S206). Next, the PLL 214 continues to operate by the frequency division ratio set by the frequency division ratio control unit 215 in step S205, and the demodulator 212 decodes the data transmitted by the active tag 11 following the unmodulated wave. After the adjustment (S207), the RF tag reader 20 ends the operation shown in this flowchart.
在步驟S200中,藉由使用者所為之開關13的操作為指示被動標籤之收訊者時(S200:No),控制部217係以將混頻器202的輸出訊號傳送至LPF222的方式將開關220作切換,並且以將混頻器203的輸出訊號傳送至LPF223的方式將開關221作切換(S208)。In step S200, when the operation of the switch 13 by the user is to indicate the receiver of the passive tag (S200: No), the control unit 217 switches the output signal of the mixer 202 to the LPF 222. The switch 220 is switched, and the switch 221 is switched in such a manner that the output signal of the mixer 203 is transmitted to the LPF 223 (S208).
接著,控制部217係將用以生成直接轉換方式之收訊中的本局訊號頻率的分頻比初始值設定在PLL214(S209)。接著,控制部217係進行載波感測(carrier sense),判定是否另外存在有通訊中的RF標籤(S210)。若另外存在有通訊中的RF標籤時(S210:Yes),控制部217係反覆步驟S210,至變得未另外存在有通訊中的RF標籤為止。Next, the control unit 217 sets the initial value of the division ratio of the local signal frequency in the reception for generating the direct conversion method to the PLL 214 (S209). Next, the control unit 217 performs carrier sense (carrier sense) to determine whether or not there is another RF tag in communication (S210). If there is another RF tag in communication (S210: Yes), the control unit 217 repeats step S210 until the RF tag in communication is not present.
若未另外存在有通訊中的RF標籤時(S210:No),控制部217係使未圖示的送訊機開始對被動標籤傳送電波(S211),解調器212係將由被動標籤所被送訊的資料進行解調(S212),RF標籤讀取器20即結束本流程圖所示之動作。If there is no RF tag in communication (S210: No), the control unit 217 causes the transmitter (not shown) to start transmitting radio waves to the passive tag (S211), and the demodulator 212 is sent by the passive tag. The data is demodulated (S212), and the RF tag reader 20 ends the operation shown in this flowchart.
以上針對本發明之第2實施形態加以說明。The second embodiment of the present invention has been described above.
由上述說明可知,藉由本實施形態之RF標籤讀取器20,可在由主動標籤11所被送訊的電波收訊中改善收訊特性,並且可將來自主動標籤的資料與來自被動標籤的資料,以1台RF標籤讀取器20作切換來進行收訊。As apparent from the above description, the RF tag reader 20 of the present embodiment can improve the reception characteristics in the radio wave reception transmitted by the active tag 11, and can extract the data from the active tag with the passive tag. The data is switched by one RF tag reader 20 for receiving.
接著針對本發明之第3實施形態加以說明。Next, a third embodiment of the present invention will be described.
第12圖係顯示第3實施形態中之RF標籤讀取器20之功能構成之一例的方塊圖。本實施形態之RF標籤讀取器20係具有:天線200、LNA201、混頻器202、混頻器203、AGC放大器206、AGC放大器207、ADC208、ADC209、LPF210、LPF211、解調器212、移相器213、PLL214、分頻比控制部215、Δf計算部216、控制部217、及濾波器電路230。Fig. 12 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the third embodiment. The RF tag reader 20 of the present embodiment includes an antenna 200, an LNA 201, a mixer 202, a mixer 203, an AGC amplifier 206, an AGC amplifier 207, an ADC 208, an ADC 209, an LPF 210, an LPF 211, a demodulator 212, and a shifter. The phaser 213, the PLL 214, the frequency division ratio control unit 215, the Δf calculation unit 216, the control unit 217, and the filter circuit 230.
本實施形態中之RF標籤讀取器20具有濾波器電路230來取代BPF204及BPF205,在這方面,與使用第3圖所說明之第1實施形態中之RF標籤讀取器20不同。其中,除了以下說明的內容以外,在第10圖中,標註與第3圖相同元件符號的構件係具有與第3圖中的構件為相同或同樣的功能,故省略說明。The RF tag reader 20 of the present embodiment has a filter circuit 230 instead of the BPF 204 and the BPF 205, and is different from the RF tag reader 20 of the first embodiment described with reference to Fig. 3 in this respect. In addition, in the tenth figure, the member which has the same code|symbol is attached|subjected by FIG. 3, and has the same or the same function as the member of FIG. 3, and the description is abbreviate|omitted.
濾波器電路230係藉由來自控制部217的指示,作為BPF或LPF的任一者來進行動作。濾波器電路230為例如第13圖所示之構成,在開關231~236全部關斷(OFF)的情形下作為LPF進行動作,在開關231~236全部導通(ON)的情形則係作為複數濾波器的BPF進行動作。控制部217係在被動標籤收訊時,將開關231~236全部控制成關斷,在主動標籤收訊時,將開關231~236全部控制成導通。The filter circuit 230 operates as either a BPF or an LPF by an instruction from the control unit 217. The filter circuit 230 has a configuration as shown in FIG. 13, for example, when the switches 231 to 236 are all turned off (OFF), and as the LPF, when the switches 231 to 236 are all turned on (ON), they are used as complex filters. The BPF of the device operates. The control unit 217 controls all of the switches 231 to 236 to be turned off during passive tag reception, and controls all of the switches 231 to 236 to be turned on when the active tag is received.
以上針對本發明之第3電施形態加以說明。The third embodiment of the present invention will be described above.
由上述說明可知,藉由本實施形態之RF標籤讀取器20,可在由主動標籤11所被送訊的電波收訊中改善收訊特性,並且可使在將來自主動標籤的資料與來自被動標籤的資料,以1台RF標籤讀取器20作切換來進行收訊時之電路構成小型化。As apparent from the above description, the RF tag reader 20 of the present embodiment can improve the reception characteristics in the radio wave reception transmitted by the active tag 11, and can make the data from the active tag and the passive The data of the tag is miniaturized when the one RF tag reader 20 is switched to perform reception.
接著針對本發明之第4實施形態加以說明。Next, a fourth embodiment of the present invention will be described.
第14圖係顯示第4實施形態中之RF標籤讀取器20之功能構成之一例的方塊圖。本實施形態之RF標籤讀取器20係具有:天線200、LNA201、混頻器202、混頻器203、AGC放大器206、AGC放大器207、ADC208、ADC209、LPF210、LPF211、解調器212、移相器213、PLL214、Δf計算部216、控制部217、可變BPF240、可變BPF241、及BPF控制部242。Fig. 14 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the fourth embodiment. The RF tag reader 20 of the present embodiment includes an antenna 200, an LNA 201, a mixer 202, a mixer 203, an AGC amplifier 206, an AGC amplifier 207, an ADC 208, an ADC 209, an LPF 210, an LPF 211, a demodulator 212, and a shifter. The phaser 213, the PLL 214, the Δf calculation unit 216, the control unit 217, the variable BPF 240, the variable BPF 241, and the BPF control unit 242.
本實施形態中之RF標籤讀取器20具有可變BPF240、可變BPF241、及BPF控制部242來取代BPF204、BPF205、及分頻比控制部215,在這方面,與使用第3圖所說明之第1實施形態中之RF標籤讀取器20不同。其中,除了以下說明的內容以外,在第14圖中,標註與第3圖相同元件符號的構件係具有與第3圖中的構件為相同或同樣的功能,故省略說明。The RF tag reader 20 of the present embodiment includes a variable BPF 240, a variable BPF 241, and a BPF control unit 242 instead of the BPF 204, the BPF 205, and the frequency division ratio control unit 215. In this regard, the description will be made using FIG. The RF tag reader 20 in the first embodiment is different. In the fourth embodiment, the components having the same reference numerals as those in the third embodiment have the same or similar functions as those of the members in the third embodiment, and therefore the description thereof will be omitted.
可變BPF240係按照來自BPF控制部242的控制訊號,在維持通頻帶之頻帶寬度的情形下直接使通頻帶的中心頻率產生變化。可變BPF240係例如第15圖所示之電路構成。BPF控制部242係可藉由使可變電阻243-1及可變電阻243-2的電阻值產生變化,而使可變BPF240之通頻帶的中心頻率產生變化。The variable BPF 240 directly changes the center frequency of the pass band while maintaining the bandwidth of the pass band in accordance with the control signal from the BPF control unit 242. The variable BPF 240 is configured, for example, as shown in Fig. 15. The BPF control unit 242 can change the center frequency of the pass band of the variable BPF 240 by changing the resistance values of the variable resistor 243-1 and the variable resistor 243-2.
在此,各自的可變電阻243係可構成為例如第16圖所示。BPF控制部242係可藉由將各自的開關244進行導通或關斷,而使可變電阻243全體的電阻值改變。其中,BPF控制部242亦可取代可變電阻243之電阻值的變化,或者連同可變電阻243之電阻值的變化一起使可變BPF240內之電容器的電容改變。此外,在第16圖之例中,可變BPF240係藉由電阻與電容器所構成,但是以其他形態而言,可變BPF240亦可藉由線圈與電容器所構成。可變BPF241亦與可變BPF240為相同的構成,故省略說明。Here, the respective variable resistors 243 can be configured as shown in, for example, FIG. The BPF control unit 242 can change the resistance value of the entire variable resistor 243 by turning on or off the respective switches 244. The BPF control unit 242 may also change the capacitance of the capacitor in the variable BPF 240 in place of the change in the resistance value of the variable resistor 243 or together with the change in the resistance value of the variable resistor 243. Further, in the example of Fig. 16, the variable BPF 240 is constituted by a resistor and a capacitor, but in other forms, the variable BPF 240 may be constituted by a coil and a capacitor. Since the variable BPF 241 has the same configuration as that of the variable BPF 240, description thereof will be omitted.
例如第17圖所示,BPF控制部242係具有控制訊號表格70及控制訊號供給部71。在控制訊號表格70係例如第18圖所示,與頻率差700產生對應而預先儲存有表示可變BPF240及可變BPF241內之各開關之控制的控制訊號701。控制訊號表格70內的控制訊號701係當藉由Δf計算部216計算出相對應的頻率差時,為了將該頻率差分、可變BPF240及可變BPF241之通頻帶的中心頻率作挪移而應供給至可變BPF240及可變BPF241的值,藉由製造者等利用實驗預先進行測定且予以儲存。For example, as shown in FIG. 17, the BPF control unit 242 has a control signal table 70 and a control signal supply unit 71. In the control signal table 70, for example, as shown in FIG. 18, a control signal 701 indicating control of each of the switches in the variable BPF 240 and the variable BPF 241 is stored in advance in association with the frequency difference 700. When the control signal 701 in the control signal table 70 calculates the corresponding frequency difference by the Δf calculating unit 216, it should be supplied to shift the frequency difference, the center frequency of the pass band of the variable BPF 240 and the variable BPF 241. The values up to the variable BPF 240 and the variable BPF 241 are measured and stored in advance by an experimenter or the like using an experiment.
控制訊號供給部71係在由Δf計算部216接收到表示頻率差Δf的訊號時,由控制訊號表格70抽出與所接收到的頻率差Δf相對應的控制訊號,將所抽出的控制訊號供給至可變BPF240及可變BPF241。When the control signal supply unit 71 receives the signal indicating the frequency difference Δf by the Δf calculation unit 216, the control signal table 70 extracts the control signal corresponding to the received frequency difference Δf, and supplies the extracted control signal to the control signal. Variable BPF240 and variable BPF241.
在此,藉由主動標籤11內的基準訊號、與RF標籤讀取器20內的基準訊號的偏移,若由主動標籤11所被送訊的訊號的頻率、與RF標籤讀取器20所假想的收訊訊號的頻率偏移預先訂定的頻率份以上,或者頻率的偏移量未達預先訂定的頻率時,以藉由Low-IF方式所為之收訊,會有藉由混頻器202及混頻器203予以下轉換的訊號的頻率分別由可變BPF240及可變BPF241的通頻帶脫離的情形。Here, by the offset between the reference signal in the active tag 11 and the reference signal in the RF tag reader 20, if the frequency of the signal transmitted by the active tag 11 is the same as that of the RF tag reader 20 If the frequency of the imaginary received signal is shifted by more than the predetermined frequency, or if the offset of the frequency is less than the predetermined frequency, the signal is transmitted by the Low-IF method, and the frequency is mixed. The frequency of the signal down-converted by the device 202 and the mixer 203 is separated from the passband of the variable BPF 240 and the variable BPF 241, respectively.
由可變BPF240及可變BPF241的通頻帶脫離的訊號並未被供給至AGC放大器206及AGC放大器207以後,因此解調器212無法直接將來自主動標籤11的訊號正確地進行解調。Since the signal of the passband of the variable BPF 240 and the variable BPF 241 is not supplied to the AGC amplifier 206 and the AGC amplifier 207, the demodulator 212 cannot directly demodulate the signal from the active tag 11.
相對於此,BPF控制部242係按照藉由Δf計算部216所被計算出的頻率差Δf,將可變BPF240及可變BPF241之通頻帶的中心頻率,將用以偏移該頻率差Δf份的控制訊號分別供給至可變BPF240及可變BPF241。藉此,藉由混頻器202及混頻器203予以下轉換的訊號的頻率係不會由可變BPF240及可變BPF241的通頻帶脫離,而分別供給至AGC放大器206及AGC放大器207以後。因此,本實施形態之RF標籤讀取器20係可將來自主動標籤11的訊號正確地進行解調。On the other hand, the BPF control unit 242 shifts the center frequency of the pass band of the variable BPF 240 and the variable BPF 241 in accordance with the frequency difference Δf calculated by the Δf calculating unit 216 to offset the frequency difference Δf. The control signals are supplied to the variable BPF 240 and the variable BPF 241, respectively. Thereby, the frequency of the signal down-converted by the mixer 202 and the mixer 203 is not separated from the pass band of the variable BPF 240 and the variable BPF 241, and is supplied to the AGC amplifier 206 and the AGC amplifier 207, respectively. Therefore, the RF tag reader 20 of the present embodiment can correctly demodulate the signal from the active tag 11.
接著,一面參照第19圖的流程圖,一面說明本實施形態中之控制部217之動作。第19圖係顯示第4實施形態中之RF標籤讀取器20之動作之一例的流程圖。透過被設在RF標籤讀取器20的開關13,由使用者被指示來自主動標籤11之資料的收訊時,RF標籤讀取器20係開始本流程圖所示之動作。其中,除了以下說明的內容以外,在第19圖中,標註與第9圖相同元件符號的處理係與第9圖中的處理相同,故省略說明。Next, the operation of the control unit 217 in the present embodiment will be described with reference to the flowchart of Fig. 19. Fig. 19 is a flow chart showing an example of the operation of the RF tag reader 20 in the fourth embodiment. When the user is instructed to receive the data from the active tag 11 via the switch 13 provided in the RF tag reader 20, the RF tag reader 20 starts the operation shown in this flowchart. It is to be noted that the processing of the same reference numerals as in the ninth embodiment is the same as the processing in the ninth embodiment except for the contents described below, and therefore the description thereof will be omitted.
在步驟S101中,當由LPF211被輸出無調變訊號時(S101:Yes),控制部217係使Δf計算部216及BPF控制部242起動(S110),在至藉由Δf計算部216所為之頻率差Δf的計算、及藉由BPF控制部242所為之控制訊號的供給結束為止的期間,待機預定時間(例如數十μ秒)。When the unmodulated signal is output from the LPF 211 in the step S101 (S101: Yes), the control unit 217 activates the Δf calculating unit 216 and the BPF control unit 242 (S110), and the Δf calculating unit 216 determines The calculation of the frequency difference Δf and the period until the supply of the control signal by the BPF control unit 242 is completed wait for a predetermined time (for example, several tens of μsec).
Δf計算部216係計算出收訊訊號的頻率與預先訂定的頻率的頻率差Δf,將計算出的Δf的值供給至BPF控制部242。BPF控制部242係由控制訊號表格70抽出與由Δf計算部216所接收到的頻率差Δf相對應的控制訊號,且將所抽出的控制訊號分別供給至可變BPF240及可變BPF241(S111)。The Δf calculating unit 216 calculates the frequency difference Δf between the frequency of the received signal and the predetermined frequency, and supplies the calculated value of Δf to the BPF control unit 242. The BPF control unit 242 extracts the control signal corresponding to the frequency difference Δf received by the Δf calculating unit 216 from the control signal table 70, and supplies the extracted control signals to the variable BPF 240 and the variable BPF 241 (S111), respectively. .
接著,控制部217係使Δf計算部216及BPF控制部242停止(S112)。接著,解調器212係將由主動標籤11繼無調變波所被送訊的資料進行解調(S105),RF標籤讀取器20係結束本流程圖所示之動作。Next, the control unit 217 stops the Δf calculation unit 216 and the BPF control unit 242 (S112). Next, the demodulator 212 demodulates the data transmitted by the active tag 11 following the unmodulated wave (S105), and the RF tag reader 20 ends the operation shown in this flowchart.
以上針對本發明之第4實施形態加以說明。The fourth embodiment of the present invention has been described above.
由上述說明可知,在本實施形態之RF標籤讀取器20中,亦可在由主動標籤11所被送訊的電波的收訊中改善收訊特性。As apparent from the above description, in the RF tag reader 20 of the present embodiment, the reception characteristics can be improved in the reception of radio waves transmitted by the active tag 11.
接著針對本發明之第5實施形態加以說明。Next, a fifth embodiment of the present invention will be described.
第20圖係顯示第5實施形態中之RF標籤讀取器20之功能構成之一例的方塊圖。本實施形態之RF標籤讀取器20係具有:天線200、LNA201、混頻器202、混頻器203、AGC放大器206、AGC放大器207、ADC208、ADC209、LPF210、LPF211、解調器212、移相器213、PLL214、Δf計算部216、控制部217、可變BPF240、可變BPF241、BPF控制部242、開關250、開關251、LPF252、及LPF253。Fig. 20 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the fifth embodiment. The RF tag reader 20 of the present embodiment includes an antenna 200, an LNA 201, a mixer 202, a mixer 203, an AGC amplifier 206, an AGC amplifier 207, an ADC 208, an ADC 209, an LPF 210, an LPF 211, a demodulator 212, and a shifter. The phaser 213, the PLL 214, the Δf calculation unit 216, the control unit 217, the variable BPF 240, the variable BPF 241, the BPF control unit 242, the switch 250, the switch 251, the LPF 252, and the LPF 253.
本實施形態中之RF標籤讀取器20具有開關250、開關251、LPF252、及LPF253,在這方面,與使用第14圖所說明之第4實施形態中之RF標籤讀取器20不同。其中,除了以下說明的內容以外,在第20圖中,標註與第14圖相同元件符號的構件係具有與第14圖中的構件為相同或同樣的功能,故省略說明。The RF tag reader 20 of the present embodiment includes the switch 250, the switch 251, the LPF 252, and the LPF 253. In this respect, the RF tag reader 20 of the fourth embodiment described with reference to Fig. 14 is used. In addition, in the 20th drawing, the member which has the same code|symbol is attached|subjected by FIG. 14 is the same or the same function as the member of FIG.
開關250係按照來自控制部217的指示,將混頻器202的輸出訊號傳送至LPF252或可變BPF240。開關251係按照來自控制部217的指示,將混頻器203的輸出訊號傳送至LPF253或可變BPF241。The switch 250 transmits the output signal of the mixer 202 to the LPF 252 or the variable BPF 240 in accordance with an instruction from the control unit 217. The switch 251 transmits the output signal of the mixer 203 to the LPF 253 or the variable BPF 241 in accordance with an instruction from the control unit 217.
LPF252係由透過開關250所被提供之訊號之中,抽出預定頻率以下之頻帶的訊號且供給至AGC放大器206。LPF253係由透過開關251所被提供之訊號之中,抽出預定頻率以下之頻帶的訊號且供給至AGC放大器207。The LPF 252 extracts a signal of a frequency band below a predetermined frequency from the signal supplied through the switch 250 and supplies it to the AGC amplifier 206. The LPF 253 extracts a signal of a frequency band equal to or lower than a predetermined frequency from the signal supplied from the switch 251 and supplies it to the AGC amplifier 207.
接著,一面參照第21圖之流程圖,一面說明本實施形態中之控制部217之動作。第21圖係顯示第5實施形態中之RF標籤讀取器20之動作之一例的流程圖。Next, the operation of the control unit 217 in the present embodiment will be described with reference to the flowchart of Fig. 21. Fig. 21 is a flow chart showing an example of the operation of the RF tag reader 20 in the fifth embodiment.
在本實施形態中,被設在RF標籤讀取器20的開關13係可對RF標籤讀取器20指示主動標籤的收訊或被動標籤的收訊的任一者。RF標籤讀取器20係在開關13被操作時,即開始本流程圖所示之動作。其中,除了以下說明之內容,在第21圖中,標註與第11圖相同元件符號的處理係與第11圖中的處理相同,故省略說明。In the present embodiment, the switch 13 provided in the RF tag reader 20 can instruct the RF tag reader 20 to indicate either the reception of the active tag or the reception of the passive tag. The RF tag reader 20 starts the operation shown in this flowchart when the switch 13 is operated. In the above, the processing of the same reference numerals as in the eleventh embodiment is the same as the processing in the eleventh embodiment, and therefore the description thereof is omitted.
在步驟S203中,當由LPF211被輸出無調變訊號時(S203:Yes),控制部217係使Δf計算部216及BPF控制部242起動(S220),至藉由Δf計算部216所為之頻率差Δf的計算、及藉由BPF控制部242所為之控制訊號的供給結束為止的期間,待機預定時間(例如數十μ秒)。In step S203, when the LPF 211 is outputted with the no-modulation signal (S203: Yes), the control unit 217 activates the Δf calculation unit 216 and the BPF control unit 242 (S220) to the frequency determined by the Δf calculation unit 216. The calculation of the difference Δf and the period until the supply of the control signal by the BPF control unit 242 is completed wait for a predetermined time (for example, several tens of μsec).
Δf計算部216係計算出收訊訊號的頻率與預先訂定的頻率的頻率差Δf,將所計算出的Δf的值供給至BPF控制部242。由控制訊號表格70抽出與由Δf計算部216所接收到的頻率差Δf相對應的控制訊號,將所抽出的控制訊號分別供給至可變BPF240及可變BPF241(S221)。The Δf calculating unit 216 calculates the frequency difference Δf between the frequency of the received signal and the predetermined frequency, and supplies the calculated value of Δf to the BPF control unit 242. The control signal corresponding to the frequency difference Δf received by the Δf calculating unit 216 is extracted from the control signal table 70, and the extracted control signals are supplied to the variable BPF 240 and the variable BPF 241, respectively (S221).
接著,控制部217係使Δf計算部216及BPF控制部242停止(S222)。接著,解調器212係將由主動標籤11繼無調變波所被送訊的資料進行解調(S207),RF標籤讀取器20係結束本流程圖所示之動作。Next, the control unit 217 stops the Δf calculation unit 216 and the BPF control unit 242 (S222). Next, the demodulator 212 demodulates the data transmitted by the active tag 11 following the unmodulated wave (S207), and the RF tag reader 20 ends the operation shown in this flowchart.
以上針對本發明之第5實施形態加以說明。The fifth embodiment of the present invention has been described above.
由上述說明可知,在本實施形態之RF標籤讀取器20中,亦可在由主動標籤11所被送訊的電波的收訊中改善收訊特性,並且可將來自主動標籤的資料、與來自被動標籤的資料,以1台RF標籤讀取器20作切換而進行收訊。As can be seen from the above description, in the RF tag reader 20 of the present embodiment, the reception characteristics can be improved in the reception of the radio waves transmitted by the active tag 11, and the data from the active tag can be The data from the passive tag is switched by one RF tag reader 20 for switching.
接著,針對本發明之第6實施形態加以說明。Next, a sixth embodiment of the present invention will be described.
第22圖係顯示第6實施形態中之RF標籤讀取器20之功能構成之一.例的方塊圖。本實施形態之RF標籤讀取器20係具有:天線200、LNA201、混頻器202、混頻器203、AGC放大器206、AGC放大器207、ADC208、ADC209、LPF210、LPF211、解調器212、移相器213、PLL214、Δf計算部216、控制部217、BPF控制部242、及濾波器電路260。Fig. 22 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the sixth embodiment. The RF tag reader 20 of the present embodiment includes an antenna 200, an LNA 201, a mixer 202, a mixer 203, an AGC amplifier 206, an AGC amplifier 207, an ADC 208, an ADC 209, an LPF 210, an LPF 211, a demodulator 212, and a shifter. The phaser 213, the PLL 214, the Δf calculation unit 216, the control unit 217, the BPF control unit 242, and the filter circuit 260.
本實施形態中之RF標籤讀取器20係具有濾波器電路260來取代可變BPF240及可變BPF241,在這方面,與使用第14圖所說明之第4實施形態中之RF標籤讀取器20不同。其中,除了以下說明的內容以外,在第22圖中,標註與第14圖相同元件符號的構件係具有與第14圖中的構件為相同或同樣的功能,故省略說明。The RF tag reader 20 of the present embodiment has a filter circuit 260 instead of the variable BPF 240 and the variable BPF 241. In this regard, the RF tag reader of the fourth embodiment described with reference to Fig. 14 is used. 20 different. In addition, in the 22nd drawing, the member which has the same code|symbol with the code|symbol of FIG. 14 has the same or the same function as the member of FIG.
濾波器電路260係藉由來自控制部217的指示,作為BPF或LPF的任一者來進行動作。濾波器電路260係例如第23圖所示之構成,當開關261~266全部關斷時,係作為LPF進行動作,當開關261~266全部導通時,則係作為複數濾波器的BPF進行動作。控制部217係在被動標籤收訊時,將開關261~266全部控制成關斷,在主動標籤收訊時,將開關261~266全部控制成導通。The filter circuit 260 operates as either a BPF or an LPF by an instruction from the control unit 217. The filter circuit 260 is configured as shown in Fig. 23, and operates as an LPF when all of the switches 261 to 266 are turned off, and operates as a BPF of a complex filter when all of the switches 261 to 266 are turned on. The control unit 217 controls all of the switches 261 to 266 to be turned off during passive tag reception, and controls all of the switches 261 to 266 to be turned on when the active tag is received.
此外,BPF控制部242係開關261~266全部變為導通,且作為複數濾波器的BPF進行動作時,對連接於開關261~266之各個的可變電阻供給與藉由Δf計算部216所計算出的頻率差Δf相對應的控制訊號,藉此將作為BPF而進行動作的濾波器電路260的通頻帶的中心頻率,偏移藉由Δf計算部216所計算出的頻率差Δf份。Further, when all of the switches 261 to 266 are turned on and the BPF as the complex filter operates, the BPF control unit 242 supplies the variable resistors connected to the switches 261 to 266 and the Δf calculating unit 216. The control signal corresponding to the frequency difference Δf is generated, whereby the center frequency of the pass band of the filter circuit 260 operating as the BPF is shifted by the frequency difference Δf calculated by the Δf calculating unit 216.
以上針對本發明之第6實施形態加以說明。The sixth embodiment of the present invention has been described above.
由上述說明可知,在本實施形態之RF標籤讀取器20中,亦可在由主動標籤11所被送訊的電波的收訊中改善收訊特性,並且可使在將來自主動標籤的資料、與來自被動標籤的資料,以1台RF標籤讀取器20作切換而進行收訊時之電路構成小型化。As apparent from the above description, in the RF tag reader 20 of the present embodiment, the reception characteristics can be improved in the reception of the radio waves transmitted by the active tag 11, and the data from the active tag can be obtained. The data from the passive tag is miniaturized when the RF tag reader 20 is switched and the reception is performed.
其中,本發明並非限定於上述實施形態,在其要旨範圍內可為各種變形。However, the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the gist of the invention.
例如,在上述第3實施形態中之濾波器電路230及第6實施形態中之濾波器電路260中,將I成分及Q成分的LPF別以單端(single end)以3次實際濾波器為例加以說明,但是本發明並非侷限於此。以其他形態而言,濾波器電路的I成分及Q成分的LPF亦可分別以差動所構成,亦可以未達3次或3次以上之次數的實際濾波器所構成。For example, in the filter circuit 230 of the third embodiment and the filter circuit 260 of the sixth embodiment, the LPF of the I component and the Q component are set to have a single end as a three-time actual filter. The example is explained, but the invention is not limited thereto. In other aspects, the I component of the filter circuit and the LPF of the Q component may be formed by differential, or may be formed by an actual filter that is not three or more times.
此外,濾波器電路之I成分及Q成分的LPF如日本特開2008-205962之揭示,亦可分別以差動利用5次的實際濾波器來構成。其中,當使用日本特開2008-205962所揭示之濾波器電路作為第6實施形態中之濾波器電路260時,若將被插入在I成分的LPF與Q成分的LPF之間的電阻,形成為藉由控制部217的控制而使電阻值發生變化的可變電阻即可。Further, the I component of the filter circuit and the LPF of the Q component can be configured by using an actual filter that is differentially used five times, as disclosed in Japanese Laid-Open Patent Publication No. 2008-205962. When the filter circuit disclosed in Japanese Laid-Open Patent Publication No. 2008-205962 is used as the filter circuit 260 in the sixth embodiment, the resistor inserted between the LPF of the I component and the LPF of the Q component is formed as The variable resistor whose resistance value is changed by the control of the control unit 217 may be used.
10...RFID系統10. . . RFID system
11...主動標籤11. . . Active label
12...資料處理裝置12. . . Data processing device
13...開關13. . . switch
20...RF標籤讀取器20. . . RF tag reader
30...CW30. . . CW
31...引導音31. . . Guiding tone
32...前序訊號32. . . Preamble signal
33...資料33. . . data
41...乘算器41. . . Multiplier
42...乘算器42. . . Multiplier
43...加算器43. . . Adder
44...反相器44. . . inverter
45...迴路濾波器45. . . Loop filter
46...NCO46. . . NCO
47...加算器47. . . Adder
48...積分器48. . . Integrator
50...分頻比表格50. . . Divide ratio table
51...分頻比設定部51. . . Frequency division ratio setting unit
60...相位比較器60. . . Phase comparator
61...充電泵61. . . Charge pump
62...迴路濾波器62. . . Loop filter
63...VCO63. . . VCO
64...可變分頻器64. . . Variable divider
70...控制訊號表格70. . . Control signal form
71...控制訊號供給部71. . . Control signal supply
200...天線200. . . antenna
201...LNA201. . . LNA
202...混頻器202. . . Mixer
203...混頻器203. . . Mixer
204...BPF204. . . BPF
205...BPF205. . . BPF
206...AGC放大器206. . . AGC amplifier
207...AGC放大器207. . . AGC amplifier
208...ADC208. . . ADC
209...ADC209. . . ADC
210...LPF210. . . LPF
211...LPF211. . . LPF
212...解調器212. . . Demodulator
213...移相器213. . . Phase shifter
214...PLL214. . . PLL
215...分頻比控制部215. . . Frequency division ratio control unit
216...Δf計算部216. . . Δf calculation unit
217...控制部217. . . Control department
220...開關220. . . switch
221...開關221. . . switch
222...LPF222. . . LPF
223...LPF223. . . LPF
230...濾波器電路230. . . Filter circuit
231~236...開關231~236. . . switch
240...可變BPF240. . . Variable BPF
241...可變BPF241. . . Variable BPF
242...BPF控制部242. . . BPF Control Department
243...可變電阻243. . . Variable resistance
244...開關244. . . switch
250...開關250. . . switch
251...開關251. . . switch
252...LPF252. . . LPF
253...LPF253. . . LPF
260...濾波器電路260. . . Filter circuit
500...頻率差500. . . Frequency difference
501...參數的值501. . . Parameter value
700...頻率差700. . . Frequency difference
701...控制訊號701. . . Control signal
第1圖係顯示本發明之一實施形態之RFID系統10之一例的系統構成圖。Fig. 1 is a system configuration diagram showing an example of an RFID system 10 according to an embodiment of the present invention.
第2圖係顯示由主動標籤11所被送訊之訊號之規格之一例圖。Fig. 2 is a view showing an example of the specifications of the signal transmitted by the active tag 11.
第3圖係顯示第1實施形態中之RF標籤讀取器20之功能構成之一例的方塊圖。Fig. 3 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the first embodiment.
第4圖係用以說明頻率差Δf之計算方法的概念圖。Fig. 4 is a conceptual diagram for explaining a calculation method of the frequency difference Δf.
第5圖係顯示Δf計算部216之其他例的方塊圖。Fig. 5 is a block diagram showing another example of the Δf calculating unit 216.
第6圖係顯示PLL214之功能構成之一例的方塊圖。Fig. 6 is a block diagram showing an example of the functional configuration of the PLL 214.
第7圖係顯示分頻比控制部215之功能構成之一例的方塊圖。Fig. 7 is a block diagram showing an example of the functional configuration of the frequency division ratio control unit 215.
第8圖係顯示儲放在分頻比表格50之資料之構造之一例圖。Fig. 8 is a view showing an example of the construction of the data stored in the frequency division ratio table 50.
第9圖係顯示第1實施形態中之RF標籤讀取器20之動作之一例的流程圖。Fig. 9 is a flow chart showing an example of the operation of the RF tag reader 20 in the first embodiment.
第10圖係顯示第2實施形態中之RF標籤讀取器20之功能構成之一例的方塊圖。Fig. 10 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the second embodiment.
第11圖係顯示第2實施形態中之RF標籤讀取器20之動作之一例的流程圖。Fig. 11 is a flow chart showing an example of the operation of the RF tag reader 20 in the second embodiment.
第12圖係顯示第3實施形態中之RF標籤讀取器20之功能構成之一例的方塊圖。Fig. 12 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the third embodiment.
第13圖係顯示濾波器電路230之電路構成之一例的電路圖。Fig. 13 is a circuit diagram showing an example of the circuit configuration of the filter circuit 230.
第14圖係顯示第4實施形態中之RF標籤讀取器20之功能構成之一例的方塊圖。Fig. 14 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the fourth embodiment.
第15圖係顯示可變BPF240之電路構成之一例的電路圖。Fig. 15 is a circuit diagram showing an example of the circuit configuration of the variable BPF 240.
第16圖係顯示可變電阻之電路構成之一例的電路圖。Fig. 16 is a circuit diagram showing an example of a circuit configuration of a variable resistor.
第17圖係顯示BPF控制部242之功能構成之一例的方塊圖。Fig. 17 is a block diagram showing an example of the functional configuration of the BPF control unit 242.
第18圖係顯示儲放在控制訊號表格70之資料之構造之一例圖。Fig. 18 is a view showing an example of the construction of the data stored in the control signal table 70.
第19圖係顯示第4實施形態中之RF標籤讀取器20之動作之一例的流程圖。Fig. 19 is a flow chart showing an example of the operation of the RF tag reader 20 in the fourth embodiment.
第20圖係顯示第5實施形態中之RF標籤讀取器20之功能構成之一例的方塊圖。Fig. 20 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the fifth embodiment.
第21圖係顯示第5實施形態中之RF標籤讀取器20之動作之一例的流程圖。Fig. 21 is a flow chart showing an example of the operation of the RF tag reader 20 in the fifth embodiment.
第22圖係顯示第6實施形態中之RF標籤讀取器20之功能構成之一例的方塊圖。Fig. 22 is a block diagram showing an example of the functional configuration of the RF tag reader 20 in the sixth embodiment.
第23圖係顯示濾波器電路260之電路構成之一例的電路圖。Fig. 23 is a circuit diagram showing an example of the circuit configuration of the filter circuit 260.
11...主動標籤11. . . Active label
12...資料處理裝置12. . . Data processing device
13...開關13. . . switch
20...RF標籤讀取器20. . . RF tag reader
200...天線200. . . antenna
201...LNA201. . . LNA
202...混頻器202. . . Mixer
203...混頻器203. . . Mixer
204...BPF204. . . BPF
205...BPF205. . . BPF
206...AGC放大器206. . . AGC amplifier
207...AGC放大器207. . . AGC amplifier
208...ADC208. . . ADC
209...ADC209. . . ADC
210...LPF210. . . LPF
211...LPF211. . . LPF
212...解調器212. . . Demodulator
213...移相器213. . . Phase shifter
214...PLL214. . . PLL
215...分頻比控制部215. . . Frequency division ratio control unit
216...Δf計算部216. . . Δf calculation unit
217...控制部217. . . Control department
Claims (7)
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JP2009069362A JP5172752B2 (en) | 2009-03-23 | 2009-03-23 | RF tag reader circuit |
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TWI427537B true TWI427537B (en) | 2014-02-21 |
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CN102013028B (en) * | 2010-12-16 | 2013-01-02 | 上海龙晶微电子有限公司 | Ultrahigh frequency radio frequency identification reader-writer |
TWI490519B (en) * | 2013-05-22 | 2015-07-01 | Univ Nat Cheng Kung | Harmonic radar radio frequency tag |
SG10201509261UA (en) * | 2015-11-09 | 2017-06-29 | Huawei Int Pte Ltd | Apparatus and method for direct radio frequency (rf) sampling in near field communication (nfc) devices |
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JP3908201B2 (en) * | 2003-06-26 | 2007-04-25 | 富士通株式会社 | Active target detection system and method |
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US6672512B2 (en) * | 1999-12-27 | 2004-01-06 | Symbol Technologies, Inc. | Combined biometric reader/RFID circuit |
US7124942B2 (en) * | 2003-12-05 | 2006-10-24 | Hid Corporation | Low voltage signal stripping circuit for an RFID reader |
TWI296781B (en) * | 2004-11-09 | 2008-05-11 | Fujitsu Ltd | Rfid tag |
TWI306218B (en) * | 2004-12-20 | 2009-02-11 | Wha Yu Ind Co Ltd | |
TWI301244B (en) * | 2005-03-22 | 2008-09-21 | Fujitsu Ltd | Rfid tag |
TWI301947B (en) * | 2005-04-05 | 2008-10-11 | Fujitsu Ltd | Rfid tag |
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TW200813857A (en) * | 2006-09-15 | 2008-03-16 | Fujitsu Ltd | RF tag reader and method |
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JP2010226272A (en) | 2010-10-07 |
WO2010109978A1 (en) | 2010-09-30 |
JP5172752B2 (en) | 2013-03-27 |
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