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SI4021 데이터시트(PDF) 11 Page - Silicon Laboratories

부품명 SI4021
상세설명  Automatic antenna tuning circuit
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제조업체  SILABS [Silicon Laboratories]
홈페이지  http://www.silabs.com
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Si4021
11
Modulated RF Spectrum
At 433 MHz with
180 kHz Deviation at 64 kbps
At 868 MHz with
180 kHz Deviation at 64 kbps
17:11:41 Dec 7, 2005
Ref 10 dBm
Atten 20 dB
#Samp
Log
10
dB/
VAv g
24
W1 S2
S3 FC
AA
Center 434 MHz
#Res BW 1 kHz
#VBW 1 kHz
Span 2 MHz
Sw eep 4.074 s (2000 pts)
17:26:17 Dec 7, 2005
Ref 10 dBm
Atten 20 dB
#Samp
Log
10
dB/
VAv g
50
W1 S2
S3 FC
AA
Center 868 MHz
#Res BW 1 kHz
#VBW 1 kHz
Span 2 MHz
Sw eep 4.074 s (2000 pts)
Spurious RF Spectrum
With 10 MHz CLK Output Enabled at 433 MHz
Antenna Tuning Characteristics
750–970 MHz
17:18:23 Dec 7, 2005
Ref 10 dBm
Atten 20 dB
Mkr1
 19.98 MHz
-44.23 dB
#Peak
Log
10
dB/
VAv g
3
W1 S2
S3 FC
AA
Center 434 MHz
#Res BW 3 kHz
#VBW 300 Hz
Span 50 MHz
Sw eep 45.47 s (2000 pts)
1
1 R
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.


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