射频实测接受灵敏度的方法Practical Sensitivity Testing.pdf
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Design Note
DN002
SWRA097 Page 1 of 15
Practical Sensitivity Testing
By Morten Engjom
Keywords
• Receiver Testing
• Sensitivity
• PER (Packet Error Rate)
• BER (Bit Error Rate)
1 Introduction
To properly evaluate the receiver part of a
transceiver, it is necessary to be able to
find the sensitivity threshold, i.e. the
lowest input signal the receiver can
decode with acceptable signal quality.
There are several approaches to find the
sensitivity threshold of a receiver, but the
various methods require different levels of
instrumentation. Since our costumers can
be equipped with anything from a full RF
lab to no equipment at all, this design note
covers both simple and more complex
methods. The design note uses
CC1100/CC2500 to illustrate the methods,
but the principles can be used also for any
other of our products.
The sensitivity measurements described in
this document are:
1) PER test using RF generator with
packet option and SmartRF
®
Studio to receive the packets.
2) Overview of PER test using
LabView and dedicated RF
generator with packet option (for
automated testing).
3) BER test with dedicated BER
tester, using the transceiver in
“synchronous serial mode”.
4) BER test with oscilloscope to
decide the received bit errors.
Transceiver used in “synchronous
serial mode”.
5) PER test using SmartRF
®
Studio
packet test and attenuators to find
the link budget.
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