![]() To see why this is the case, we have to go back to a simple channel model and look at the channel termination, then we can derive the channel response in terms of the rise time seen in the channel. The 2nd point is only correct in specific situations and is incorrectly attributed to the signal, rather than the channel. The test and measurement folks have it correct and they understand what it is they are measuring: they are measuring a channel’s response to some input signal. In high-speed PCB design, where it is stated as a highest frequency value contained in a digital signal.Test and measurement, specifically with measurements of RC circuits or low-pass filters with frequency analyzers or oscilloscopes.The knee frequency is often quoted in two areas: With that out of the way, let’s dig deep into the meaning of the knee frequency and its conceptual origins. ![]() The basic conceptual understanding behind the knee frequency is also misunderstood by many designers, including by newer designers trying their hand at SI topics. The knee frequency is another one of those old guidelines that is cited in situations where it does not apply, and it can be proven to be incorrect in real systems. The calculation is sometimes given as a homework problem in electronics classes and in intermediate mathematics classes. The above statement can be proven with basic math. The knee frequency tells you something about the response of a channel. All digital signals have infinite bandwidth.
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