Si4020
Modulated RF Spectrum
At 433 MHz with
At 868 MHz with
180 kHz Deviation at 64 kbps
180 kHz Deviation at 64 kbps
15:43:45 Oct 29, 2003
Atten 5 dB
15:46:09 Oct 29, 2003
Ref -10 dBm
#Peak
Log
10
dB/
Ref -10 dBm
#Peak
Log
Atten 5 dB
10
dB/
VAvg
100
W1S2
S3 FC
AA
VAvg
100
W1S2
S3 FC
AA
Center 434 MHz
Res BW 10 kHz
Span 2 MHz Center 868 MHz
Sweep 20.07 ms (2001 pts) Res BW 10 kHz
Span 2 MHz
Sweep 20.07 ms (2001 pts)
VBW 100 kHz
VBW 100 kHz
Spurious RF Spectrum
With 10 MHz CLK Output Enabled at 433 MHz
Antenna Tuning Characteristics
750–970 MHz
16:29:03 Jun 17, 2003
16:54:54 Mar 11, 2003
Mkr1 ∆ 20.0 MHz
Mkr1 915.0 MHz
-37.62 dBm
Ref 0 dBm
#Peak
Log
10
dB/
Atten 10 dB
-55.11 dB
Ref -36 dBm
#Atten 0 dB
Peak
Log
1
*
1
1R
dB/
Marker ∆
20.000000 MHz
-55.11 dB
Marker
915.000000 MHz
-37.62 dBm
W1S2
S3 FC
AA
V1 M2
S3 FC
AA
1
Center 434.8 MHz
#Res BW 3 kHz
Span 50 MHz Start 700 MHz
Sweep 45.47 s (401 pts) #Res BW 1 MHz
Stop 1.05 GHz
Sweep 50 ms (401 pts)
#VBW 300 Hz
VBW 1 MHz
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.
11
SILICON [ SILICON ]
