CN202331516U

CN202331516U - UHF RFID reader-writer chip

Info

Publication number: CN202331516U
Application number: CN2011204477492U
Authority: CN
Inventors: 陈亚平; 关亮中
Original assignee: Chengdu RML Technology Co Ltd
Current assignee: Chengdu RML Technology Co Ltd
Priority date: 2011-11-12
Filing date: 2011-11-12
Publication date: 2012-07-11
Anticipated expiration: 2021-11-12

Abstract

The utility model relates to a non-contact type information identification system, in particular to an RFID (Radio Frequency Identification) reader-writer chip working at ultra high frequency (UHF) of 840-960. The UHF RFID reader-writer chip mainly comprises a micro controller unit (MCU), a radio frequency transceiver module and a modem module, wherein the radio frequency transceiver module is connected with the MCU through the modem module; the modem module comprises a TX module, an RX module, a data memory FIFO (First In First Outlet), a received signal strength indication module RSSI (Received Signal Strength Indicator) and a multiplexer (MUX); and the radio frequency transceiver module comprises an RX channel, a TX channel and a frequency synthesizer. The UHF RFID reader-writer chip disclosed by the utility model has the advantages of small size, high integrated level, strong adaptability and strong anti-jamming capability.

Description

UHF rfid interrogator chip

Technical field

The utility model relates to a kind of contactless information identification system, particularly a kind of UHF rfid interrogator chip of 840～960 of working in.

Background technology

REID is to utilize wireless radio frequency mode to carry out the noncontact two-way communication, to reach the automatic identification technology of identifying purpose and swap data.According to employed electromagnetic wave frequency range, this technology can be divided into three types of low frequencies, high frequency, ultrahigh frequency, super high frequency technique wherein, and it is far away to have a decipherment distance, and recognition speed is fast, can discern high-speed moving object, advantage that data capacity is big.

The rfid system of hyper band mainly comprises rfid interrogator and two parts of RFID label: rfid interrogator is modulated to armed baseband signal on the carrier wave; Send to the RFID label, the unmodulated carrier wave of emission is launched the carrier wave that modulation needs in order to energy and label that the label continuous firing is provided continuously then; Label obtains energy from the carrier wave of read write line, according to the command content of the read write line that receives, the return message reflection modulation of label is loaded on the continuous carrier of read write line, and read write line identifies the return signal of label from continuous carrier.Existing rfid interrogator volume is big, and structure is complicated, and integrated level is lower, and power consumption is high; Adopt traditional conciliation scheme, the signal gain amplifier is fixed, and can not adapt to the echoed signal of unlike signal intensity; What adopt is the analog filtering technology, poor anti jamming capability.

The utility model content

The purpose of the utility model is to overcome the above-mentioned deficiency of prior art, provides that a kind of volume is little, integrated level is high, and adaptability is strong, the UHF rfid interrogator chip that antijamming capability is strong.

To achieve these goals, the technical scheme of the utility model employing is:

UHF rfid interrogator chip; Said UHF rfid interrogator chip mainly comprises microprocessing unit MCU, RF receiving and transmission module, modulation module; Said RF receiving and transmission module is connected with microprocessing unit MCU through the modulation module; Said microprocessing unit MCU also is connected with flash memory fash memory, high-speed cache SRAM, reset control circuit Reset control, house dog timing circuit WDT, timer Timers, universal asynchronous reception/dispensing device UART, SPI circuit SPI, port controller Port controller, universal serial bus I2C, interruptable controller Interupt controller and power supervisor power management through data bus; Said modulation module comprises intensity indicating module RSSI, the multiplexer MUX of TX module, RX module, data memory FIFO, reception signal, and said RF receiving and transmission module comprises RX passage, TX passage, frequency synthesizer.

The UHF rfid interrogator chip of the utility model mainly comprises microprocessing unit MCU, RF receiving and transmission module, modulation module; UHF rfid interrogator chip receives the signal and transmission signal that extraneous tag reflection is returned through logical RF receiving and transmission module; RF receiving and transmission module comprises RX passage, TX passage, frequency synthesizer; The RX passage is a receiving cable, and the backscattering of RFID label is sent to the modulation module through the RX passage; The TX passage is a transmission channel, and the modulation module is passed through TX channel transfer modulated signal to the RFID label.

The RX passage comprises to down-conversion mixer, the DC emphasizer circuit that squints, low-pass filter (LPF), programmable gain amplifier (PGA), analog-digital converter (ADC).Different RF signals is converted to baseband signal to down-conversion mixer; Carry out the DC bias correcting through DC skew emphasizer circuit again; Integrated low-pass filter (LPF) can be adjusted filtering parameter, to adapt to the electronic tag echo speed of handling different rates, has greatly improved the type of discrimination with the identification electronic tag of electronic tag; The signal that programmable gain amplifier (PGA) provides enough gain demodulate reception to arrive; Programmable gain amplifier (PGA) can be adjusted according to the amplitude of echoed signal; Make the read write line chip adapt to the echoed signal of unlike signal intensity, greatly improved the reliability and the decipherment distance of decoding; Analog-digital converter subsequently (ADC) produces a digital baseband signal; Digital baseband signal makes modulation enter into numerical portion; Analog-digital converter (ADC) becomes digital signal with the analog signal conversion of electronic tag; Carry out adaptive digital filtering, greatly strengthened the antijamming capability of read write line.

The beneficial effect of the utility model is:The utility model is provided with the high hardware cell of integrated level, has reduced the volume of read write line chip greatly, makes miniaturization of read write line chip and modularization, and power consumption also obtains corresponding reduction, the convenient embedding in the middle of the miscellaneous equipment; Integrated low-pass filter (LPF) can be adjusted filtering parameter; To adapt to the electronic tag echo speed of handling different rates; Greatly improved the type of discrimination with the identification electronic tag of electronic tag; Programmable gain amplifier (PGA) can be adjusted according to the amplitude of echoed signal, makes the read write line chip adapt to the echoed signal of unlike signal intensity, has greatly improved the reliability and the decipherment distance of decoding; RF receiving and transmission module becomes digital signal with the analog signal conversion of electronic tag, carries out adaptive digital filtering, has greatly strengthened the antijamming capability of read write line.

Description of drawings

Fig. 1 is the utility model UHF rfid interrogator chip carrier composition.

Fig. 2 is a modulation module rack composition.

Fig. 3 is the RF receiving and transmission module Organization Chart.

Mark among the figure: among Fig. 1,101-RFID read write line chip, 102-modulation module, 103-RF receiving and transmission module, 104-coupling mechanism, 105-exterior antenna, 106-microprocessing unit (MCU), 107-power amplifier; Among Fig. 3,301-is to down-conversion mixer, the 302-DC emphasizer circuit that squints, 303-first low-pass filter (LPF); 304-programmable gain amplifier (PGA), 305-analog-digital converter (ADC), 306-driving amplifier (DA); 307-is to upper frequency mixer, 308-digital analog converter (DAC), 309-TX passage; The 310-frequency synthesizer, 311-RX passage, 312-second low-pass filter (LPF).

Embodiment

Below in conjunction with accompanying drawing, the utility model is done detailed explanation.

For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

Embodiment 1

Shown in accompanying drawing 1 in the UHF rfid interrogator chip of present embodiment; Said rfid interrogator chip 101 mainly comprises microprocessing unit (MCU) 106, RF receiving and transmission module 103, modulation module 102; Said RF receiving and transmission module 103 is connected with microprocessing unit (MCU) 106 through modulation module 102, and said microprocessing unit (MCU) 106 also is connected with flash memory (fash memory), high-speed cache (SRAM), reset control circuit (Reset control), house dog timing circuit (WDT), timer (Timers), universal asynchronous reception/dispensing device (UART), SPI circuit (SPI), port controller (Port controller), universal serial bus (I2C), interruptable controller (Interupt controller) and power supervisor (power management) through data bus.RF receiving and transmission module 103 is respectively arranged with emission port and receiving port, and said emission port is connected with coupling mechanism 104 through power amplifier 107, and coupling mechanism 104 is connected with exterior antenna 105 again; Said receiving port is connected with exterior antenna 105 through coupling mechanism 104.

Shown in accompanying drawing 2; Modulation module 102 comprises TX module, RX module, data-carrier store (FIFO), receives intensity indicating module (RSSI), the multiplexer (MUX) of signal; Said data-carrier store (FIFO) comprises TX data-carrier store, RX data-carrier store; The TX module is used for sending data to RF receiving and transmission module, and the RX module is used for receiving data from RF receiving and transmission module, and data-carrier store (FIFO) is as the data-carrier store that sends or receive data; The intensity indicating module (RSSI) that receives signal is used for measuring the intensity of current reception signal, and multiplexer (MUX) is used for testing the modulation module.

Shown in accompanying drawing 3, RF receiving and transmission module 103 comprises RX passage 311, TX passage 309, frequency synthesizer 310.RX passage 311 is a receiving cable; The backscattering of RFID label is sent to the modulation module through RX passage 311; The modulation module transmits modulated signals to the RFID label through TX passage 309, and single frequency of frequency synthesizer 310 generations is used for frequency is transformed into RF (transmission frequency) or vice versa from base band (baseband).RX passage 311 is that receiving cable comprises to down-conversion mixer 301, DC skew emphasizer circuit 302, the first low-pass filters (LPF) 303; Programmable gain amplifier (PGA) 304; Analog-digital converter (ADC) 305, different RF signals is converted to baseband signal to down-conversion mixer 301, and the DC skew in the signal is corrected by DC skew emphasizer circuit 302; Channel selecting has integrated first low-pass filter (LPF) 303 to realize filtering harmonic; Its adjustable wide-band is confirmed by the RF register value, the signal that programmable gain amplifier (PGA) 304 provides enough gain demodulate reception to arrive, and its programmable-gain is confirmed by the RF register value; Analog-digital converter subsequently (ADC) 305 produces a digital baseband signal, and digital baseband signal makes modulation enter into numerical portion.

TX passage 309 is a sendaisle; Sendaisle is by driving amplifier (DA) 306, to upper frequency mixer 307, the second low-pass filters (LPF) 312; Digital analog converter (DAC) 308 is formed; The ASK modulation signal is converted to analog part by digital analog converter (DAC) 308 by numerical portion, the unwanted harmonic wave of second low-pass filter (LPF), 312 filterings subsequently, and its BREATHABLE BANDWIDTH is confirmed by the RF register value; To upper frequency mixer 307 baseband signal is sent to the RF signal that is amplified by DA, gain amplifier is confirmed by the RF register value.

The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.

Claims

1.UHF rfid interrogator chip; It is characterized in that: said UHF rfid interrogator chip mainly comprises microprocessing unit MCU, RF receiving and transmission module, modulation module; Said RF receiving and transmission module is connected with microprocessing unit MCU through the modulation module; Said microprocessing unit MCU also is connected with flash memory fash memory, high-speed cache SRAM, reset control circuit Reset control, house dog timing circuit WDT, timer Timers, universal asynchronous reception/dispensing device UART, SPI circuit SPI, port controller Port controller, universal serial bus I2C, interruptable controller Interupt controller and power supervisor power management through data bus; Said modulation module comprises intensity indicating module RSSI, the multiplexer MUX of TX module, RX module, data memory FIFO, reception signal, and said RF receiving and transmission module comprises RX passage, TX passage, frequency synthesizer.