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| 型号： | PMB2208 |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Mixer and IF Vector Modulator |
| 中文描述： | 混频器和中频矢量调制器 |
| 文件页数： | 22/27页 |
| 文件大小： | 766K |
| 代理商： | PMB2208 |
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Reference
5 - 6
PMB 2208
preliminary
Wireless Components
Confidential
Specification, August 1999
1)
The mixer current decreases when no external resistors to ground are
connected at IF and IFX. In this case the typical value of
,
MO+
,
MOX
is 1mA.
Design hint. The settling time is determined by the time required to charge
the external capacitors.
2)
3)
Note: There are external resistors (82 Ohms) at IF and IFX to ground.
4)
Application hint
5)
Design hint
6)
The carrier suppression can be optimized for a particular application using
offset voltages at the baseband inputs A/AX and B/BX. The optimum
values can be found iteratively by adjusting the A/AX and B/BX offsets
alternately until the carrier disappears into the noise floor. If the actual
offset voltages differ from their optimum values by
9
26$
and
9
26%
, the
carrier suppression in dB is given by
where
9
P
is the peak value of the signal voltage at A/AX and B/BX.
7)
D
IM3
can be increased by reducing the amplitude of the modulator inputs
V
A-AX
and V
B-BX
.
a
c
20 log
10
V
)
2
V
(
V
(
)
2
+
-------------------------------------------------------------
=
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