Design Note DN025
3.3.1.3
Measurement Results
All results presented in this chapter are based on measurements performed with CC1101 JTI
EM Rev 1.0 Reference Design board [6]. A minimum of six units have been measured in
order to obtain an average result which is presented in this report. All measurement results
presented are the average of each batch tested from typical devices.
The output power and harmonics measurements were performed with four different power
PATABLE settings: 0xC0 and 0xC2 for 10 dBm applications and 0x8E and 0x50 for 0 dBm
applications.
Note: all values are in dBm if not otherwise stated.
SmartRF04
®
RF studio was used to configure the devices. The settings for the registers are
the default settings used.
3.3.1.3.1
Sensitivity
Freq. Band
Data Rate [kBaud]
JTI with LC
Discrete ML
868 MHz
1.2
−111.6
−111.0
38.4
−103.6
−103.0
250
−94.8
−94.0
500
−87.2
−87.0
915 MHz
1.2k
−111.4
−111.0
38.4
−103.2
−103.0
250
−94.4
−94.0
500
−87.3
−87.0
Table 1. Average Sensitivity Values Obtained
As can be seen from Table 1; the JTI reference design with LC has the same or better
sensitivity than the discrete solution with Multi-Layer (ML) inductors.
Freq. Band
Data Rate [kBaud]
JTI no LC
JTI with LC
Difference
868 MHz
1.2
−111.4
−111.6
−0.2
38.4
−103.1
−103.6
−0.5
250
−94.4
−94.8
−0.4
500
−86.5
−87.2
−0.7
915 MHz
1.2k
−111.3
−111.4
−0.1
38.4
−102.2
−103.2
−0.9
250
−93.8
−94.4
−0.6
500
−86.2
−87.3
−1.1
Table 2. Difference in Sensitivity Values with and without LC Filter
As can be seen from Table 1 and Table 2; the sensitivity is same or better with the LC filter.
SWRA250A
Page 9 of 26
JOHANSON [ JOHANSON TECHNOLOGY INC. ]
