參數(shù)資料
型號(hào)： AD8343ARUZ-REEL
廠商： ANALOG DEVICES INC
元件分類(lèi)： 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)： 18/32頁(yè)
文件大?。?/td> 2171K
代理商： AD8343ARUZ-REEL
AD8343
Rev. B | Page 25 of 32
If the result is not as expected, the balun is probably producing
an unexpected impedance transformation. If the performance
is extremely far from the desired result and it was assumed that
the output impedance of the balun was 50 Ω, it is necessary to
measure the output impedance of the balun in question. The
design process must be repeated using the baluns output imped-
ance instead of 50 Ω as the target. However, if the performance
is close to the desired result it is possible to tweak the values of
the matching network to achieve a satisfactory outcome.
These changes begin with a change from one standard value to
the adjacent standard value. With these minor modifications to
the matching network, one is able to evaluate the trend required
to reach the desired result.
If the result is unsatisfactory and an acceptable compromise
cannot be reached by further adjustment of the matching net-
work, there are two options: obtain a better balun, or attempt a
simultaneous conjugate match to both ports of the balun.
Accomplishing the latter (or even evaluating the prospects for
useful improvement) requires obtaining full two-port, single-
ended-to-differential S parameters for the balun, and requires
the use of the ATN 4000 or a similar multiport network
analyzer test set. Gonzalez presents formulas for calculating
the simultaneous conjugate match in his book, Microwave
Transistor Amplifiers.
At higher frequencies, the measurement process described above
becomes increasingly corrupted by unaccounted for impedance
transformations occurring in the traces and pads between the
input connectors and the extended reference plane. One approach
to dealing with this problem is to access the desired measure-
ment points by soldering down semirigid coaxial cables that
have been connected to the VNA and directly calibrated at the
free ends.
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