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我试图通过尝试在到达测量接收器时将DUT的预期输出功率降低到-15到-20dBm左右来跟踪我所知道的这种VNA型号的良好实践/最佳性能(
保持良好的压缩状态)。 在这样做时,我假设测量接收器之前耦合器损耗约15dB,再加上DUT通过我的开关等路径长度损失了几个dB。然后我会使用接收器衰减器将功率降低到所需水平 。 我是否认为耦合器是我应该在接收器路径中考虑的唯一因素? 我应该考虑到它吗? 我担心仪器可能已经考虑了~15dB的损耗,或者其他路径元件会在任何一个方向受到进一步的影响(混频器损耗/ IF增益模块???)任何指导都会感激不尽! 谢谢 以上来自于谷歌翻译 以下为原文 I am trying to follow what I have been informed is good practice/optimum performance for this model of VNA, by attempting to get the expected output power of my DUT down to around -15 to -20dBm by the time it reaches the measurement receiver (to keep it well out of compression). In doing this i have assumed ~15dB loss from the coupler before the measurement receiver plus a couple more dB loss from path lengths from the DUT through my switches etc. I would then use the receiver attenuators to get the power down further to the required level. Am I correct in thinking that the coupler is the only element i should take account of in the receiver path? Should I be taking account of it at all? I am worried that possibly the ~15dB loss will already have been taken account of by the instrument, or will be further affected in either direction by other path elements (mixer losses/IF gain blocks???) Any guidance gratefully received! Thanks |
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2个回答
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-15 dB损耗已在我们所有规格中得到补偿,这些规格位于测试端口,而不是接收器(例外:直接接收器访问规范)。
通常,如果您保持低于0 dBm的测试端口功率,您将避免任何压缩。 即使输入为+10 dBm,压缩也非常小,约为0.1 dB。 这是旧的PNA。 在较新的PNA上,压缩甚至更好,大约0.02,典型值为+10 dBm。 以上来自于谷歌翻译 以下为原文 The -15 dB loss is already compensated for in all our specifications, which are at the test port, and not the receiver (exception: direct receiver access specs). In general, if you stay below 0 dBm test port power you will avoid any compression. Even at +10 dBm input, the compression is quite small, on the order of 0.1 dB. This is on the older PNA. On the newer PNA, the compression is even better, around 0.02 typically at +10 dBm. |
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脑洞大赛9 发表于 2018-9-25 19:37 谢谢你的回复,我想这清除了我的困惑。 因此,如果我知道我的DUT输出将具有高于~0dBm的测试端口功率,我应该使用测量接收器步进衰减器来补偿这一点。 例如 到PNA的端口2的20dBm DUT输出功率= 20dBm的BREC衰减设置,以获得最佳测量。 虽然实际上它只会给结果带来少量差异,但它可能比抱歉更安全! 以上来自于谷歌翻译 以下为原文 Thank you for your reply, I think this clears up my confusion. Therefore if I know I will have above ~0dBm test port power from my DUT output, I should compensate for this using the measurement receiver step attenuator's. e.g. 20dBm DUT output power into Port 2 of the PNA = 20dBm attenuation setting for BREC to get optimum measurement. Although in reality it will make only a small amount of difference to the result its probably better safe than sorry! |
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