CHR2244-QDG_15 Datasheet, PDF (13/14 Pages) United Monolithic Semiconductors – 5.8 GHz One Antenna Reflective Transponder for Tag

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
T/R ^modulated WK_in
Vcc ^{2MHz sub-} Vcc
carrier
5.8GHz
CW
Det
RF out
product of
5.8GHz
X
modulated
sub-carrier
Vcc
RF-in
T/R
3V
DATA_out
WK_in
3V
SB_out
RF_out
Spectrum
Figure 4a: Uplink mode
CARRIER
modulated sub-carrier
around carrier
SPEC TRUM ANALYSER
A TTE NUA TO R
IF 500kHz
+V
T/ R
CHR2244
W K_ in
MOD
Figure 4b: Uplink test bench diagram
RF
5,8GHz
Ref. :DSCHR2244-QDG9030 - 30 Jan 09
13/14
Specifications subject to change without notice
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