Digital Signal Processing Reference
In-Depth Information
1
0
0
0
1
0
1
1
0
0
0
1
0
0
Figure 9.12
Modulation procedure for proximity coupling smart cards in accordance with
ISO 14443 — Type A: Top: Downlink — ASK 100% with modified Miller coding (voltage
path at the reader antenna). Bottom: Uplink — load modulation with ASK modulated 847 kHz
subcarrier in Manchester coding (voltage path at the transponder coil)
Tek run: 10.0 MS/s
Sample
[.............................T.............................]
T
1
Ch 1
2.00 V
M 5.00
µ
s
Ch2 S
2.4 V
Figure 9.13
The oscillogram of a signal generated at the reader antenna by a Type A card
using load modulation with an ASK modulated subcarrier
Search WWH ::
Custom Search