millwood0 发表于 2013-6-8 08:29
1. It is very simple, especially if you break it down to a few modules: a display module (driven by ...
millwood0 发表于 2013-6-8 08:29
1. It is very simple, especially if you break it down to a few modules: a display module (driven by ...
millwood0 发表于 2013-6-8 19:41
"测量低频率,应该使用测周法。"
You may want to take a look at some commercial frequency meters / co ...
1M的频率,闸门1S,精度达到10-6
1K的频率,闸门1s,精度为10-3
对于上面两个经典的频率,你如何做到“9位”?
1、有本事在我的条件下给出最好的设计。
]我比较有兴趣DIY的是0~200MHz TTL/CMOS和0~3GHz -20dBm~+10dBm RF,
第二,代码未对进出中断的时间做补偿。
millwood0 发表于 2013-6-9 02:51
0-200Mhz frequency counter is totally doable, as long as you don't have to deal with signal condit ...
millwood0 发表于 2013-6-9 03:04
There are easily available RF counters that you can use as a prescaler. MB5xx is quite inexpensive f ...
Well, you just need to re-route the input of the prescaler to a GPIO and pulse the chip until its output flips...
Signal conditioning is the most difficult part of the analog section,
and reference interpolation is the most difficult part of the digital section.
If not on a tight budget, many RF MMICs out there can make your life a lot easier,
and reference interpolation is the most difficult part of the digital section.
Much easier than the RF afe.
millwood0 发表于 2013-6-9 02:55
depending on how you structure your modules, you may not have to compensate for latency: as long a ...
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