User's Manual

veriCLASS Hardware Specification VP3500 Reader Board, 3500-906
5.2 Modulation Waveforms
The measurements were taken for a concentric arrangement between reference PICC and test PCD
in four different distances.
The results may vary slightly between different reader boards due to production tolerances.
Note: Metal or ferrite material in proximity of the antenna will lead to detuning effects, which may
cause major changes in the RF properties.
5.2.1
ISO/IEC 14443 Type A Waveforms
The waveforms were measured in accordance to ISO/IEC10373-6 (16.5MHz resonance frequency
of reference PICC).
Table 7: ISO/IEC 14443 Type A Waveforms
Distance 0mm @ 106kbps Distance 7.5mm @ 106kbps
t1 [ns] 2914 t1 [ns] 2913
t2 [ns] 2070 t2 [ns] 2057
t3 [ns] 438 t3 [ns] 436
t4 [ns] 236 t4 [ns] 239
Os [%] 0.35 Os [%] 0.48
Distance 12mm @ 106kbps Distance 20mm @ 106kbps
t1 [ns] 2912 t1 [ns] 2915
t2 [ns] 2018 t2 [ns] 1977
t3 [ns] 442 t3 [ns] 459
t4 [ns] 244 t4 [ns] 248
Os [%] 0.36 Os [%] 0.64
March 2011
Page 17 of 28
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