Network the rise of the concept with the thing, the management expectancies to all kinds of articles of people are higher and higher, hope to network the present state of following every article in real time through the thing. The ultra-high frequency RFID ‘ Electronic label It is one of the effective means to realize articles and is followed to tie on every article definitely, therefore the application of the ultra-high frequency RFID is expanding constantly, the demand for ultra-high frequency RFID reading and writing device is thereupon increase. Though some ultra-high frequency RFID reading and writing device with brand on world, domestic market now, but has his strong points in its design plan, stability, dependability while employing still remain to improve. So how can design stable cost performance high meeting ultra-high frequency of market demand performance RFID whether one worth question that discuss in person who read and write. ... Read more
AT86RF230 is 2.4 GHz radio transceiver of the low consumption, real SPI reaches the solution of the aerial, designed ZigBee/IEEE 802.15.4. Integrate except aerial, crystal and decouple all RF key components outside electric capacity in the one piece. AT86RF230 programmable output power reaches to reach 3dBm high from – 17dBm, the receiver sensitivity is – 101dBm, the working voltage is from 1.8V to 3.6V, and integrate the internal voltage stabilizer, is mainly used in 2.4 GHz IEEE 802.15.4 and ZigBee system, 6LoWPAN and RF4CE system, wireless sensor network, industrial control, family, automation of the building and consumption electron and PC peripheral hardware,etc.. This text has introduced AT86RF230 main characteristic, the block-diagram, employs circuit diagram and RZ600 to assess board characteristic and radio circuit diagram and USB adapter circuit diagram. ... Read more
Function of the circuit ... Read more
EMI of the power of switch interferes with the source and embodies a concentrated reflection of the power switch and is in charge of, commutate the diode, high-frequency voltage transformer,etc., the interference on power of switch of the external environment condition is mainly shaking, striking by lightning, external radiation from electric wire netting,etc.. ... Read more
It is a great challenge that the engineer faces that PCB connects up that the board of telephone circuit of honeycomb connects up, the modern cell phone nearly includes all portable subsystems, each subsystem has a each other contradictory demand. A design perfect PCB must be while giving full play to each interconnected equipment performance advantage, avoid the mutual interference between the subsystems, so, have to trade off and consider to each sub systematic function as to the conflicting requirement. Though the audio frequency function of the cell phone is increasing continuously, pay concerns that the voicefrequency circuit PCB connects up few. ... Read more
Seeing that mobile phone and base station should support increasingly many honeycomb and other wireless standards at present, the aerial used for wireless application deals with more frequency bands than any time in the past. For the measurement that supports to be implemented to the base station of the honeycomb, this literary grace uses Rogers Company Rogers RO4350Bs double-deck last board dipole aerial. This compact aerial covers 900, 1,800 and 2,100MHz honeycomb frequency band, very suitable for counting with the intensity of low-cost portable electric field used for testing the intensity of electric field of base station of the honeycomb field intensity appearance Use together. ... Read more
Little electronics corporation Austriamicrosystems of Austria AS3992 ” Simply Gen 2″ UHF RFID media reader IC, the ones that offered the intensive media reader mode to need strained the wave function, and combine the sensitivity of LBT grade and distorted in advance to design. AS3992 has integrated a series of advanced function, the distorted function and – superelevation of 86dBm receives the sensitivity such as the programmable DRM wave filter, in advance, this means single design system which adopts AS3992 takes the lead in realizing that can be handed over to any market in the whole world. ... Read more
GLOBAL Positioning System, is abbreviated as GPS, namely GPS, the increasingly extensive application in recent years, have already produced the considerable GPS products demand. And with the improvement of the scientific and technological level, constant open-up of application direction, GPS will be indubitable to permeate through daily life rapidly. ... Read more
A.m. the news in March 24 ‘ Chang Shan The department rubs ‘ Beijing Communication research center Call in the following text ” The research institute of Beijing ” Succeed in, develop, 8 send, 8 charge more than input, output perpendicularity divide large location systems MIMO-OFDMA into frequently more Transmit by experiment platform in real time,last pieces of array FPGA . ... Read more
Consider from the intersection of network and construction aspect, TD-SCDMA have following several problem of mainly to gradual progress of TD-LTE: TD-LTE and other systems analyze, smooth the intersection of gradual progress and question, to the intersection of LTE and question, with organize the intersection of network and issue and terminal station issue of TD-LTE frequently LTE of gradual progress aerial of apparatus. ... Read more
