The Manchester and differential Manchester decoders have similar architectures. The
size and power consumption are within 10% of each other requiring approximately 3500
mm2 in area and 3 mW in power. These decoders also require relatively low sampling rates
of 500 kHz. The modi?¬?ed Miller encoding requires a similar area as Manchester encoding
but requires about 12 mW of power likely because of the four times higher sampling
frequency. FM0 and PIE encoding requires signi?¬?cantly higher area (2??“3 times more)
than the other encodings. Due to the increased sampling rate and complexity these encodings
require signi?¬?cantly higher power consumptions of 45 and 85 mW.
3.4 RFID Controller Design Automation
The RFID communication system consists of a transponder or tag and an interrogator or
reader. The format for exchanges between the interrogator and the transponder is a set of
commands or primitives that requests that the transponder perform a set of actions. The
speci?¬?cations of these commands vary from one standard to another. The ?¬‚ow of the RFID
compiler is speci?¬?ed in Figure 3.19. This particular compiler can accept virtually any set of
commands as input and target a microprocessor or hardware device to provide the RFID
tag controller functionality.
Figure 3.20 shows an example of the ISO 18000 Part 6C protocol for inventory and access
of a single RFID tag.
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