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LUCW3011FCL View Datasheet(PDF) - Agere -> LSI Corporation

Part Name
Description
Manufacturer
LUCW3011FCL
Agere
Agere -> LSI Corporation Agere
LUCW3011FCL Datasheet PDF : 12 Pages
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W3011
1 GHz Quadrature Modulator
Data Sheet
September 1999
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.
USB
fl = fQ = 80 kHz
0
0 dBm
fLOL = 130 MHz
fLOH = 1030 MHz
–10
–20
–30
LSB
–38 dBm
Fc
–40 dBm
–40
L3
–48 dBm
–50
–60
–70
L5
–72 dBm
L4
–75 dBm
L2
–70 dBm
U2
–50 dBm
U5
U3
–72 dBm
U4
–70 dBm
–62 dBm
–80
899.60 899.68 899.76 899.84 899.92 900 900.08 900.16 900.24 900.32 900.40
FREQUENCY (MHz)
Figure 3. W3011 Sine-Wave Modulation Output Spectrum
Data from this spectrum is used to estimate EVM by the formula:
EVM (%) = 100 Ÿ [10P(L5)/20 + 10P(L4)/20 + 10P(L3)/20 + 10P(L2)/20 + 10P(LSB)/20 + 10P(U2)/20 +
10P(U3)/20 + 10P(U4)/20 + 10P(U5)/20]/10P(USB)/20
The data presented in the spectrum above would yield:
EVM (%) = 100 Ÿ [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.
6
Lucent Technologies Inc.
 

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