Datasheet 搜索 > RF射频器件 > ADI（亚德诺） > AD8343ARUZ-REEL 数据手册 > AD8343ARUZ-REEL 数据手册 21/32 页
器件3D模型￥ 54.243
AD8343ARUZ-REEL 数据手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
分类:
RF射频器件
封装:
TSSOP-14
描述:
射频混合器 DC-to-2.5GHz Hi IP3
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P6P16Hot
原理图在P1P7P16P21
封装尺寸在P32
型号编码规则在P32
封装信息在P32
功能描述在P1P6P16
技术参数、封装参数在P1P3P5
应用领域在P1P6P26
电气规格在P8
导航目录
AD8343ARUZ-REEL数据手册
Page:
of 32 Go
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AD8343
Rev. B | Page 21 of 32
INPUT AND OUTPUT STABILITY CONSIDERATIONS
The differential configuration of the input and output ports of
the AD8343 raises the need to consider both differential and
common-mode RF stability of the device. Throughout the
following stability discussion, common mode is used to refer to
a signal that is referenced to ground. The equivalent common-
mode impedance is the value of impedance seen from the node
under discussion to ground. The book, Microwave Transistor
Amplifiers by Guillermo Gonzalez, also has an excellent section
covering stability of amplifiers.
The AD8343 is unconditionally stable for any differential
impedance, so device stability need not be considered with
respect to the differential terminations. However, the device is
potentially unstable (k factor is less than one) for some common-
mode impedances.
Figure 61 and Figure 62 plot the input and
output common-mode stability regions, respectively.
Figure 63
shows the test equipment configuration to measure these
stability circles.
The plotted stability circles in
Figure 62 indicate that the guiding
principle for preventing stability problems due to common-
mode output loading is to avoid high-Q common-mode inductive
loading. This stability concern is of particular importance when
the output is taken from the device with a center-tapped trans-
former. The common-mode inductance to the center tap arises
from imperfect coupling between the halves of the primary
winding and produces an unstable common-mode loading
condition. Fortunately, a simple solution is to insert a ferrite
bead in series with the center tap, then provide effective RF
bypassing on the power supply side of the bead. The bead
develops substantial impedance (tens of ohms) by the time
a frequency of about 200 MHz is reached. The Murata
BLM21P300S is a possible choice for many applications.
50MHz
150MHz
01034-061
FREQUENCY: 50MHz TO 2500MHz
INCREMENT: 100MHz
Figure 61. Common-Mode Input Stability Circles
01034-062
150MHz
50MHz
FREQUENCY: 50MHz TO 2500MHz INCREMENT: 100MHz
Figure 62. Common-Mode Output Stability Circles
1nH
0.1µF
0.1µF
V
POS
4-PORT NETWORK ANALYZER
S PARAMETER TEST SET
14
13
12
11
10
9
8
1
2
3
4
5
6
7
COMM
AD8343
INPP
INPM
DCPL
VPOS
PWDN
COMM
COMM
OUTP
OUTM
COMM
LOIP
LOIM
COMM
BIAS
TEE
BIAS
TEE
BIAS
TEE
BIAS
TEE
01034-063
Figure 63. Impedance and Stability Circle Test Schematic
In cases where a transmission line balun is used at the output,
the solution deserves a bit more exploration. After the differ-
ential impedance matching network is designed, it is possible
to measure or simulate the common-mode impedance seen by
the device. This impedance is plotted against the stability circles
to ensure stable operation. An alternate topology for the matching
network is required if the proposed network produces an
unacceptable common-mode impedance.
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