전자부품 데이터시트 검색엔진 |
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SI4021 데이터시트(PDF) 11 Page - Silicon Laboratories |
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SI4021 데이터시트(HTML) 11 Page - Silicon Laboratories |
11 / 35 page 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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