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  Baseband Circuits for an RFID Receiver &mdash DN381
  PDF, 76 Kb, Datei veröffentlicht: Nov 30, 2005
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  advertisement Baseband Circuits for an RFID Receiver – Design Note 381
  Philip Karantzalis
  Introduction
  Radio Frequency Identification (RFID) technology uses
  radiated and reflected RF power to identify and track a
  variety of objects. A typical RFID system consists of a
  reader and a transponder (or tag). An RFID reader contains an RF transmitter, one or more antennas and an RF
  receiver. An RFID tag is simply an uniquely identified IC
  with an antenna.
  Communication between a reader and a tag is via backscatter reflection, similar to a radar system, in the UHF
  frequencies from 860MHz to 960MHz. This design note
  describes a high performance RFID receiver.
  A Direct Conversion Receiver
  Figure 1 shows the block diagram of a direct conversion
  RF receiver—the receiver demodulates an RF carrier
  directly into a baseband signal without an intermediate
  frequency down-conversion (a zero IF receiver).
  The antenna, shared by both the transmitter and receiver,
  detects an RF carrier and passes it through a bandpass
  filter to an LT® 5516 demodulator’s RF input.
  The LT5516 direct conversion demodulator frequency
  range of 800MHz to 1.5GHz includes the UHF range used RX
  ANTENNA LT5516 DEMODULATOR …

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LT6231IDDPBF, LT6231IDD PBF