Exercise Report
Lab2-M10
EXERCISE REPORT
(LAB2-M10)
Subject of this exercise:
Performance Evaluation of a 915-MHz FSK SoC Radio Transceiver
<me>-student code
Students – Student code:
<myself> -student code
<I> -student code
Course/code:
<course>, <group>
Date & time:
20<YY>. <MM>. <DD>.
Lecturer today:
Equipment in use, device under test
Oscilloscope
Agilent 54622A
Spectrum Analyzer
Agilent E4411B ESA-L
RF Signal Generator with modulation
capability
Agilent E4430B ESG-D
Power Supply
Agilent E3630
Function Generator
Agilent 33220A
Digital Multimeter (3½ digit)
Metex ME-22T
Exercises
1. Learning the use of the new RF measuring equipment
Connect the RF signal generator to the spectrum analyzer. Generate a modulated signal with the
following parameters: carrier frequency=1 MHz, power level=0 dBm, AM modulation with modulating
frequency=10 kHz and modulation index=10%.
Vary the RBW,VBW and SPAN parameters of RF spectrum analyzer and study the spectrum of AM
signal observed at different analyzer settings.
<Experience collected during the completion of the measurement>
Study the AM signal in the time domain
<Experience collected during the completion of the measurement>
Sketch the AM signal in the time domain and its two spectra belonging to two different analyzer
settings
< Experience collected during the completion of the measurement >
2. Generation of an unmodulated signal with TRF6900A transmitter
Turn on the evaluation module and run the TRF6900 software.
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Exercise Report
Check the
screen.
Lab2-M10
state
of
all
blocks
of
TRF6900A
transceiver
using
the
main
program
<Experience collected during the completion of the measurement>
Generate an unmodulated signal by the transmitter part of TRF6900A.
Connect the output of the evaluation board to the spectrum analyzer.
Measure and record the
a) actual value of output frequency,
b) output power when Pwr Amp is set to 0 dB,
c) spectrum of output signal (Pwr Amp = 0 dB).
<Experience collected during the completion of the measurement>
Based on the measured spectrum estimate the closed-loop bandwidth of the PLL. Explain the estimation
technique you used.
<Experience collected during the completion of the measurement>
Measure and record the spurious output signals in dBc as a function of frequency.
<Experience collected during the completion of the measurement>
Correct the error in clock frequency using the TRF6900 software. What are the sources of this error
and what are the limits of the accuracy of error correction?
<Experience collected during the completion of the measurement>
3. Generation of an FSK modulated signal with the TRF6900A transmitter
Generate a binary FSK signal with large frequency deviation. Connect the output of the evaluation
module to the spectrum analyzer then measure and record the
a) two output frequencies of binary FSK carrying bits “1” and bit “0”,
<Experience collected during the completion of the measurement>
b) spectrum of FSK signal,
<Experience collected during the completion of the measurement>
c) bandwidth of FSK signal.
<Experience collected during the completion of the measurement>
4. Reception of an FSK signal with TRF6900A receiver
Generate a binary FSK signal by the RF signal generator. Connect the output of RF signal generator to
the input of the TRF6900 evaluation module
Calculate and upload the required local frequency. Calculate and record the input level of the TRF6900A
receiver (do not forget to take into consideration the effect of attenuator connected to the receiver input).
<Experience collected during the completion of the measurement>
Turn off the FSK modulation, measure and measure the RSSI characteristic by varying the TRF6900A
receiver input from -70 dBm up to -40 dBm. Calculate the sensitivity of the RSSI circuit..
<Experience collected during the completion of the measurement>
Give an binary FSK modulated signal to the input of the TRF6900A receiver. Measure and record the
demodulated signal before and after the data slicer, that is, the decision circuit.
<Experience collected during the completion of the measurement>
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Exercise Report
Lab2-M10
Measure the transfer function of the frequency discriminator. Supply an unmodulated RF signal to the
receiver input at the power level of -35 dBm and measure the frequency discriminator output from
915,100 MHz to 915,300 MHz. Calculate the sensitivity of frequency discriminator.
<Experience collected during the completion of the measurement>
Extra measurement:
If there is time left measure the eye-diagram with the help of your professor.
<Experience collected during the completion of the measurement>
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