SI4020-I1-FT【PDF 11/32 页】IC TX FSK 915MHZ 5.4V 16-TSSOP

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Si4020

Modulated RF Spectrum

At 433 MHz with

180 kHz Deviation at 64 kbps

At 868 MHz with

180 kHz Deviation at 64 kbps

15:46:09 Oct 29, 2003

Ref -10 dBm

Atten 5 dB

#Peak

Log

dB/

VAvg

100

W1S2

S3 FC

Center 434 MHz

Res BW 10 kHz

VBW 100 kHz

Span 2 MHz

Sweep 20.07 ms (2001 pts)

15:43:45 Oct 29, 2003

Ref -10 dBm

Atten 5 dB

#Peak

Log

dB/

VAvg

100

W1S2

S3 FC

Center 868 MHz

Res BW 10 kHz

VBW 100 kHz

Span 2 MHz

Sweep 20.07 ms (2001 pts)

Spurious RF Spectrum

With 10 MHz CLK Output Enabled at 433 MHz

Antenna Tuning Characteristics

750970 MHz

16:29:03 Jun 17, 2003

Ref 0 dBm

Atten 10 dB

Mkr1 20.0 MHz

-55.11 dB

#Peak

Log

dB/

W1S2

S3 FC

Center 434.8 MHz

#Res BW 3 kHz

#VBW 300 Hz

Span 50 MHz

Sweep 45.47 s (401 pts)

Marker

20.000000 MHz

-55.11 dB

16:54:54 Mar 11, 2003

Ref -36 dBm

#Atten 0 dB

Mkr1 915.0 MHz

-37.62 dBm

Peak

Log

dB/

V1 M2

S3 FC

Start 700 MHz

#Res BW 1 MHz

VBW 1 MHz

Stop 1.05 GHz

Sweep 50 ms (401 pts)

Marker

915.000000 MHz

-37.62 dBm

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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