Analog Devices AN-826 Application Note page 14

AN-826
3.5
3.0
2.5
2.0
1.5
1.0
0.5
–50 –40 –30
TRANSMITTER OUTPUT POWER LEVEL (dBm)
Figure 27. Transmitter Total EVM for an 802.16 64 QAM OFDM Signal,
10 MHz Signal Bandwidth
–130
–135
–140
–145
–150
–155
–160
–60 –50 –40
TOTAL OUTPUT POWER LEVEL (dBm)
Figure 28. Transmitter Output Noise Floor vs. Output Power (QPSK, 16 QAM,
64 QAM OFDM Modulated Signal)
–20 –10 0
–30 –20 –10 0
Rev. B | Page 14 of 16
3
2
1
0
–1
–2
–3
–60 –55 –50 –45 –40 –35 –30 –25 –20 –15 –10 –5
INPUT POWER (dBm)
Figure 29. RMS Power Detector Response and Detection Error vs. Tx Signal
Chain Output Power Level for QPSK, 16 QAM, 64 QAM OFDM Modulations
2
1
CH1 500mV CH2 20.0mVΩ
Figure 30. Power Detector Time Response for a WiMAX Downlink Burst
(Long Preamble, FCH, 64 QAM OFDM Data Sequence), T
4.5
4.0
3.5
3.0
2.5
2.0
1.5
CW
BPSK
1.0
QPSK 1/2
QPSK 3/4
16QAM 3/4
0.5
64QAM 1/2
0
0 5 10
M1.00ms A CH4 174mV
T 3.15200ms
= 25.6 μs
SYMB