W9081A Datasheet, PDF (8/12 Pages) Keysight Technologies – X-Series Measurement Application

08 | Keysight | Bluetooth X-Series Measurement Application N9081A & W9081A - Technical Overview
Key Specifications (continued)
Description
Enhanced data rate (EDR) measurements
EDR relative transmit power
Packet type
Payload
Synchronization
Trigger
Supported measurements
RF input level range
Absolute power accuracy
Measurement floor
EDR modulation accuracy
Packet type
Payload
Synchronization
Trigger
Supported measurements
RF input level range
Range (rms DEVM)
Floor
Accuracy
EDR carrier frequency stability
Packet type
Payload
Synchronization
Trigger
Supported measurements
RF input level range
Carrier frequency stability and frequency
error
EDR in-band spurious emissions
Packet type
Payload
Synchronization
Trigger
Measurement accuracy
offset freq = 1 MHz to 1.5 MHz
offset freq = other offset (2 MHz to 78 MHz)
PXA
MXA
EXA
CXA
2-DH1, 2-DH3, 2-DH5, 3-DH1, 3-DH3, 3-DH5
PRBS9, BS00, BSFF, BS0F, BS55
DPSK synchronization sequence
External, RF Burst, Periodic Timer, Free Run, Video
Power in GFSK header, power in PSK payload, relative power between GFSK header and PSK payload
+30 dBm to –70 dBm
± 0.20 dB (95%)
± 0.25 dB (95%)
± 0.29 dB (95%)
± 0.61 dB (95%)
–70 dBm (nom)
2-DH1, 2-DH3, 2-DH5, 3-DH1, 3-DH3, 3-DH5
PRBS9, BS00, BSFF, BS55
DPSK synchronization sequence
External, RF Burst, Periodic Timer, Free Run, Video
rms DEVM, peak DEVM, 99% DEVM
+30 dBm to –70 dBm
0 to 12%
1.5%
± 1.2%⁵
0 to 12% (nom)
1.6% (nom)
2-DH1, 2-DH3, 2-DH5, 3-DH1, 3-DH3, 3-DH5
PRBS9, BS00, BSFF, BS55
DPSK synchronization sequence
External, RF Burst, Periodic Timer, Free Run, Video
Worst case initial frequency error(ωi) for all packets (carrier frequency stability),
worst case frequency error for all blocks (ωo),(ωo + ωi) for all blocks
+30 dBm to –70 dBm
± 100 Hz + tfa¹ (nom)
2-DH1, 2-DH3, 2-DH5, 3-DH1, 3-DH3, 3-DH5
PRBS9, BS00, BSFF, BS55
DPSK synchronization sequence
External, RF Burst, Periodic Timer, Free Run, Video
Dominated by the ambiguity of the measurement standards⁶
Dominated by the variance of measurements⁴
1.  tfa = transmitter frequency × frequency reference accuracy.
2.  The accuracy is for absolute power measured at 2.0 MHz offset and other offsets (offset = K MHz, K= 3,…,78).
3.  The accuracy is for absolute power measured at 2.0 MHz offset and other offsets (offset = 2 MHz * K, K = 2,…,39).
4.  The measurement at these offsets is usually the measurement of noise-like signals and therefore has considerable variance. For example, with 100 ms
sweeping time, the standard deviation of the measurement is about 0.5 dB. In comparison, the computed uncertainties of the measurement for the case
with CW interference is only ± 0.20 dB (PXA), ± 0.25 dB (MXA), ± 0.29 dB (EXA), ± 0.61 dB (CXA) (95th percentile).
5.  The accuracy specification applies when the EVM to be measured is well above the measurement floor. Please refer to Bluetooth specification guide for
N9081A or W9081A for more detail explanation.
6.  The measurement standards call for averaging the signal across 3.5 µs apertures and reporting the highest result. For common impulsive power at these
offsets, this gives a variation of result with the time location of that interference that is 0.8 dB peak-to-peak and changes with a scallop shape with a 3.5 µs
period. Uncertainties in the accuracy of measuring CW-like relative power at these offsets are nominally only ± 0.03 dB (PXA), ± 0.07 dB (MXA), ± 0.09 dB
(EXA), ± 0.11 dB (CXA), but observed variations of the measurement algorithm used with impulsive interference are similar to the scalloping error.