8
Si4022
The antenna tuning characteristics was recorded in max-hold state of the spectrum analyzer. During the measurement, the
transmitters were forced to change frequencies by forcing an external reference signal to the XTL pin. While the carrier was changing
the antenna tuning circuit switched trough all the available states of the tuning circuit. The graph clearly demonstrates that while the
complete output circuit had about a 40 MHz bandwidth, the tuning allows operating in a 220 MHz band. In other words the tuning
circuit can compensate for 25% variation in the resonant frequency due to any process or manufacturing spread.
At 868 MHz with
180 kHz Deviation at 9.6 kbps
Antenna Tuning Characteristics
750970 MHz
11:14:40 May 5, 2005
L
Ref 0 dBm
Atten 10 dB
Samp
Log
10
dB/
VAvg
100
W1 S2
S3 FC
AA
Center 868 MHz
Res BW 10 kHz
VBW 10 kHz
Span 2 MHz
Sweep 40.74 ms (2001 pts)
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