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參數(shù)資料
| 型號： | SA1630 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | IF Quadrature Transceiver(IF正交收發(fā)器) |
| 中文描述： | 中頻正交收發(fā)器（中頻正交收發(fā)器） |
| 文件頁數(shù)： | 33/36頁 |
| 文件大?。?/td> | 477K |
| 代理商： | SA1630 |
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Philips Semiconductors
Application note
AN2003
SA1630 IF transceiver demonstration board
1999 Jan 05
33
Sideband suppression
An expression relating SBS to amplitude mismatch and quadrature phase error can be obtained by substituting Equations (125) and (130) into
Equation (64).
SBS
20log
1
2
GM (G
e
)
2
1
2
GM (1
(1
G
e
)
2
G
e
)
2
(G
e
)
2
(134)
Reducing and rearranging terms yields:
SBS
20log
(G
e
)
2
(G
e
)
2
(G
e2
(G
e2
1)
1)
2G
e
2G
e
(135)
There are some notable differences between this expression for SBS in Equation (135) and the carrier suppression expression in
Equation (133). There is no dominating term in front of the radical and it is independent of the magnitude of the baseband input signals. This
should make SBS much more sensitive to quadrature phase error and amplitude mismatch errors. The third term in the numerator and
denominator in Equation (135) are both a factor of amplitude mismatch, but are of opposite polarity. Thus, SBS should be much more sensitive
to amplitude mismatch variation than the case for CS. Indeed, the graph in Figure 26 shows this to be true. Equations (69) and (94) tell us that
the SA1630 SBS specification can be met with as much as 2 degrees of quadrature phase error or 0.3 dB of amplitude mismatch, but not both.
How much of one can be traded off for the other while still meeting the SA1630 –35 dBc SBS specification can be easily determined from
Equation (135) and/or by following the –35 dBc contour curve on the graph in Figure 26.
5.00
4.75
4.50
4.25
4.00
3.75
3.50
3.25
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
–25 dBc
–30 dBc
–35 dBc
–40 dBc
–45 dBc
SIDEBAND SUPPRESSION
–35 dBc SPECIFICATION
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
S
AMPLLITUDE MISMATCH (dB)
Q
SR01884
Figure 26. Sideband suppression vs. amplitude mismatch and quadrature phase error
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