5.8 GHz One Antenna Reflective Tag
CHR2244-QDG
3 - In the UPLINK MODE (figure 4a), the received CW carrier (F0) is multiplied with the modulation
signal (Fm) coming from MOD input. In fact, if ETSI CEN TC278 recommendation is applied, the
modulation is around the sub-carrier Fm. The resulting reflected signal is a transposition of Fm around
the carrier F0 (F0 ± Fm) .
Data from controller
RF-in
modulated
2MHz sub-
carrier
T/R
Vcc
WK_in
Vcc
RF in
5.8GHz
CW
T/R
3V
WK_in
3V
DATA_out
CARRIER
Det
SB_out
RF out
product of
5.8GHz
RF_out
Spectrum
X
modulated
sub-carrier
Vcc
modulated sub-carrier
around carrier
Figure 4a: Uplink mode
ATTENUATOR
SPECTRUM ANALYSER
RF
5,8GHz
IF 500kHz
T/R
+V
CHR2244
WK_in
MOD
Figure 4b: Uplink test bench diagram
Ref. :DSCHR2244-QDG9030 - 30 Jan 09
13/14
Specifications subject to change without notice
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UMS [ UNITED MONOLITHIC SEMICONDUCTORS ]
