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对于译者来说，翻译是一件枯燥的事，但对于读者来说，一本好的译作，不光能带来知识，还能带来视野的拓展。如果本书能让读者产生酣畅淋漓，意犹未尽的感觉那就好了。) X/ h# }& g1 q/ q6 P- `
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但是在本书的现有翻译章节里，还是有很多译作令我非常不满意，为了保证本书的翻译质量，我们已在做严格的校对。请对翻译仍感兴趣的人，单独试译以下段落，我会从中筛选一些作为本书的译者替补或者下一本书的译者。! W p* r. O4 U1 I* k K1 r6 K
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友情提示，翻译是一个锻炼文笔和自我学习的过程，没有多少经济收入，每千字出版社给出的稿费能卖 10平方厘米房子（以深圳每平方6万计）
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Minor Loop Gain9 _% |9 d7 ]4 b# v7 z6 a
The minor loop gain assessment is very popular for assessing the stability; I) w3 P/ u: Z
of an input filter combined with the negative resistance of a switching converter. This is also the method generally used to verify system level stability involving independent circuits. A practical example of such a black box stability assessment is the interaction between a DC/DC converter and an electronic load. Each can be considered
' j5 T) J4 w% t9 q+ D3 \as an independent circuit and each can be stable by itself, yet the combination of the two may not be as stable as either one. Output impedance measurements of a DC/DC converter connected to a B&K model 8540 electronic load, and the same converter connected to a Picotest J2112A current injector (the load current), are shown in Fig. 8.23. This measurement is an S-parameter measurement and must be transformed to Ohms. This transformation is detailed in Chap. 7, though the result is included here for convenience. For a 50-Ω VNA, the transformation is defined by Eq. (8.11):
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* B5 o2 B1 Q7 h K* BOpen-Loop Measurement
5 g$ X$ s8 J1 D# e9 }* kThe device-under-test (DUT) control loop must be operating in its normal linear region in order to measure the loop gain. This may be difficult due to small offset voltages and the high DC gain of the feedback2 F; [# }& x( J- _; V
amplifier. The operational amplifier shown in Fig. 8.8 illustrates the issue. Using the open-loop gain of 95 dB from the measurement in Fig. 8.4, and allowing a 1-mV offset in the operational amplifier, results in a 56-V output. Since the operational amplifier is not likely connected to a supply voltage that can allow a 56-V output, the amplifier
/ x1 n3 i* C2 pis not in its linear region (i.e., saturated or railed). |
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发表于 2015-7-16 15:23
发表于 2015-7-30 16:52
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