Si4022

 

 

 

vg

S2

FC

AA

At 868 MHz with

180 kHz Deviation at 9.6 kbps

11:14:40 May 5, 2005

L

Ref 0 dBm

Atten 10 dB

Samp

Log

10

dB/

VA

100

W1

S3

Center 868 MHz

Res BW 10 kHz

VBW 10 kHz

Span 2 MHz

Sweep 40.74 ms (2001 pts)

Antenna Tuning Characteristics

750–970 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.