參數(shù)資料
型號(hào)： AD8343ARUZ-REEL
廠商： ANALOG DEVICES INC
元件分類： 混頻器
英文描述： 0 MHz - 2500 MHz RF/MICROWAVE DOUBLE BALANCED MIXER
封裝： LEAD FREE, PLASTIC, TSSOP-14
文件頁(yè)數(shù)： 14/32頁(yè)
文件大?。?/td> 2171K
代理商： AD8343ARUZ-REEL
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
01
03
4
-06
1
FREQUENCY: 50MHz TO 2500MHz
INCREMENT: 100MHz
Figure 61. Common-Mode Input Stability Circles
01
03
4-
06
2
150MHz
50MHz
FREQUENCY: 50MHz TO 2500MHz
INCREMENT: 100MHz
Figure 62. Common-Mode Output Stability Circles
1nH
0.1F
VPOS
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
OUTP
OUTM
COMM
LOIP
LOIM
COMM
BIAS
TEE
BIAS
TEE
BIAS
TEE
BIAS
TEE
01
03
4-
06
3
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.
相關(guān)PDF資料
PDF描述
AD8345AREZ1 140 MHz - 1000 MHz RF/MICROWAVE QUADRAPHASE MODULATOR
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AD8345AREZ-REEL7 140 MHz - 1000 MHz RF/MICROWAVE QUADRAPHASE MODULATOR
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD8343ARUZ-REEL7 功能描述:IC MIXER ACTIVE HIGH IP3 14TSSOP RoHS:是 類別:RF/IF 和 RFID >> RF 混頻器 系列:AD8343 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- RF 型:W-CDMA 頻率:2.11GHz ~ 2.17GHz 混頻器數(shù)目:1 增益:17dB 噪音數(shù)據(jù):2.2dB 次要屬性:- 電流 - 電源:11.7mA 電源電壓:2.7 V ~ 3.3 V 包裝:托盤 封裝/外殼:12-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:12-QFN-EP（3x3）
AD8343-EVAL 制造商:Analog Devices 功能描述:AD8343 EVALUATION BOARD - Bulk
AD8343-EVALZ 制造商:Analog Devices 功能描述:AD8343 EVALUATION BOARD - Bulk
AD8344 制造商:AD 制造商全稱:Analog Devices 功能描述:Active Receive Mixer 400 MHz to 1.2 GHz
AD8344ACPZ 制造商:Analog Devices 功能描述:UP/DOWN CONV MIXER 5V 1.2GHZ 16LFCSP EP - Tape and Reel 制造商:Analog Devices 功能描述:IC SM RF MIXER 800MHZ
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