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參數資料
| 型號： | 1245-TYPE |
| 英文描述： | Uncooled Laser Transmitter |
| 中文描述： | 非致冷激光發射器 |
| 文件頁數： | 9/12頁 |
| 文件大小： | 199K |
| 代理商： | 1245-TYPE |
W3011
Data Sheet
1 GHz Quadrature Modulator
September 1999
6
Lucent Technologies Inc.
Explanation of Error Vector Magnitude (EVM) Testing
Error vector magnitude (EVM) is estimated by feeding signals to the W3011 as described above in Table 5.
A typical narrowband, sine-wave modulation output spectrum appears in Figure 3.
U5
–62 dBm
U4
–70 dBm
U3
–72 dBm
U2
–50 dBm
USB
0 dBm
Fc
–40 dBm
LSB
–38 dBm
L2
–70 dBm
L3
–48 dBm
L4
–75 dBm
L5
–72 dBm
0
–10
–20
–30
–40
–50
–60
–70
–80
fl = fQ = 80 kHz
fLOL = 130 MHz
fLOH = 1030 MHz
MAGNITUDE
(dBm)
899.60
899.68
899.76
899.84
899.92
900.08
900.16
900.24
900.32
900.40
900
FREQUENCY (MHz)
Figure 3. W3011 Sine-Wave Modulation Output Spectrum
Data from this spectrum is used to estimate EVM by the formula:
EVM (%) =
100
[10
P(L5)/20
+ 10
P(L4)/20
+ 10
P(L3)/20
+ 10
P(L2)/20
+ 10
P(LSB)/20
+ 10
P(U2)/20
+
10
P(U3)/20
+ 10
P(U4)/20
+ 10
P(U5)/20
]/10
P(USB)/20
The data presented in the spectrum above would yield:
EVM (%) = 100
[251e–6 + 178e–6 + 3981e–6 + 316e–6 +
12589e–6 + 3162e–6 + 251e–6 + 316e–6 + 794e–6]/1000e–3
= 2.18%
This approximates worst-case digital modulation results, because the sine-wave modulation estimate assumes all
spurious outputs are in phase and adds their magnitudes as scalars. In addition, this estimate includes full-
amplitude measurements of spurious peaks that would appear in adjacent and alternate channels, where a
receiver would otherwise provide attenuation. The L3 third-order intermodulation peak and LSB (lower sideband)
are normally the unwanted output frequencies that dominate the EVM estimate.
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