Standardisation - RFID: Fundamentals and Applications in Contactless Smart Cards and Identification - page 237

Tek run: 25.0 MS/s Sample

[.............................T.............................]

T

1

Ch 1

2.00 V M 2.00 µ s Ch2 S 2.4 V

Figure 9.15 The oscillogram of a signal generated at the reader antenna by a Type B card
using load modulation with BPSK modulated subcarrier

Table 9.7 Data transfer reader (PCD) → smart card (PICC) (Berger, 1998)

PCD → PICC

Type A Type B

Modulation ASK 100% ASK 10% (modulation index 8%-12%)

Bit coding Modified Miller code NRZ code

Synchronisation At bit level (start-of-frame,

end-of-frame marks)

1 start and 1 stop bit per bye
(specification in Part 3)

Baud rate 106 kBd 106 kBd

Table 9.8 Data transfer smart card (PICC) → reader (PCD) (Berger, 1998)

PICC → PCD Type A Type B

Modulation Load modulation with subcarrier

847 kHz, ASK modulated

Load modulation with subcarrier
847 kHz, BPSK modulated

Bit coding Manchester code NRZ code

Synchronisation 1 bit frame synchronisation

(start-of-frame, end-of-frame marks)

1 start and 1 stop bit per byte
(specification in Part 3)

Baud rate 106 kBd 106 kBd

Overview To sum up, the parameters shown in Tables 9.7 and 9.8 exist for the
physical interface between reader and smart card of an RFID system in accordance
with ISO 14443-2.