CHR2244 Datasheet, PDF (14/16 Pages) United Monolithic Semiconductors – 5.8 GHz One Antenna Reflective Transponder for Tag GaAs Monolithic Microwave IC

CHR2244
5.8 GHz One Antenna Reflective Tag
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) .
RF in
5.8GHz
CW
Data from controller
T/R ^modulated WK_in
Vcc ^{2MHz sub-} Vcc
carrier
Det
RF out
product of
5.8GHz
X
modulated
sub-carrier
Vcc
RF-in
TR
3V
DATA_out
WKIN
3V
SB_out
RF_out
Spectrum
Figure 4a : Uplink mode
CARRIER
modulated sub-carrier
around carrier
SPECTRUM ANALYSER
ATTENUATOR
IF 500kHz
+V
CHR2244
T/R
MOD
Figure 4b : Uplink test bench diagram
RF
5,8GHz
Ref. : DSCHR2244QDG5053 - 22 Feb 05
14/16
Specifications subject to change without notice
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