本帖最后由 alles_ok>>0_0<< 于 2015-11-30 22:20 编辑
1 ) AS3992芯片标准工作频率,支持何种协议?
可编程的多读写器模式(DRM-DenceReader Mode),工作于900MHz频段,同时支持ISO/IEC 18000-6C(EPC Gen2)以及 ISO/IEC 18000-6B通信协议。
2)AS3992 的FIFO register有多大?
via 24 bytes FIFO register 24字节 FIFO
3)AS3992 的PLL由哪些部分由组成?
The PLL section is composed of a voltage control oscillator (VCO), prescaler, main and reference divider, phase-
frequency detector, chargepump, and loop filter. All building blocks excluding the loop filter are completely integrated. Operating range is
840MHz to 960MHz
4)AS3992 收送数据时,可选的Normal模式和Direct模式有何区别?
TX:
In normal mode, all signal processing protocol coding, adding preamble or frame-sync and CRC, signal shaping, and modulation) is done
internally.
Direct mode is applied if the user wants to use analog functions only and bypass the protocol handling supported in the reader IC.Direct Mode Using Serial Interface (SPI).
兼容ISO/IEC 18000-6A,B通信协议
RX:
In the normal mode, the digitized output after decision circuit is connected to the input of the digital portion of the receiver. This input signal is the
sub-carrier coded signal, which is a digital representation of modulation signal on the RF carrier.
The direct mode is applied in case the user wants to use analog functions only and bypass the protocol handling supported in the reader IC.
5)AS3992芯片的发射天线阻抗要设计成多大合适?
The transmitter generates 20dBm output power into 50Ω load and is
capable of ASK or PR-ASK modulation.
50Ω
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