Measurement Setup - Silicon Laboratories Z-WAVE 700 Integration Manual

Instruction: Z-Wave 700 Integration Guide
a. This will give a good starting point and should result in a reasonably good match at first attempt.
8. Iteratively change component values until match is acceptable.
a. The standard matching criterion is either -6 dB or -10 dB reflection across all frequencies of interest.
b. When this goal is achieved, it is recommended to use the same values on a small sample of boards to make sure
that the matching is acceptable across production tolerances.
8.3

MEASUREMENT SETUP

The output power should be measured with a spectrum analyzer as shown in Figure 8.3 and sensitivity as shown in Figure 8.4. In
both cases, place the fixed attenuator as close as possible to the transmitter.
When measuring the sensitivity, first measure and record the output power of the Z-Wave frame generator using the spectrum
analyzer. A Z-Wave 700 module programmed with the RailTest tool can be used as the Z-Wave frame generator. Then a fixed
attenuator can be used along with a variable attenuator to adjust the input power of the DUT. For example, by setting the output
power of the Z-Wave generator to -20dBm, a fixed 50dB attenuator and a variable 50dB attenuator can be used to measure the
sensitivity with a 1dB resolution. Place the fixed attenuator close to the Z-Wave generator and conduct the measurements in a??
radio silent environment.
INS14487-3 | 2/2019
RF_line
Figure 8.2: Recommended antenna matching pi network
10dB Attenuator
DUT
Figure 8.3: Measuring transmitter output power
Attenuator
Z-Wave Frame
Generator
Figure 8.4: Measuring receiver sensitivity
ANTENNA
R2
1
0R
R1 R3
0R 0R
NM NM
GND GND
Variable Attenuator
1dB Steps
Spectrum Analyzer
DUT
9