So does this mean that there is no reason for impedence matching network in low frequency circuit. I understand that radiation occurs effectively only at high frequency. Or when the line is λ/4 or so.nikhil said:this comes into picture only when the interconnect length between the two gate acts as transmission line as now it is not assume as lumped connection.
this will comes into effect only when the electrical length of the rise time is exceed the one-sixth. hence there is distributed effect through the length. so to acheive faithfull signal level u have to match the driver impedence plus characteristics impedence equal to the receiver impedence.
I must add to this comment that this is ballpark figure and is an agreement, hence standard also, engineers decided to go with. Nothing magical with it. Engineers obey standards. If you wondered where this number/figure comes.this will comes into effect only when the electrical length of the rise time is exceed the one-sixth.
tuza2000 said:is there any picture about impedence matching?
i want to know how to use it.
Added after 1 minutes:
what's the input matching network and output matching network mean in im.doc?
how can we design it?
If both load(your mean source?) and output resistance are real numbers the answer is YES. In theory and low-frequency this is the case. But this happens in 1% of the cases.freewilly30 said:impedence matching is that the load resistance is equal to the output resistance of your circuit...
that ensures maximum power delivery for your load
djalli said:freewilly30 said:impedence matching is that the load
If you do not match it what will happen?
1) Power is not fully delivered. Power is bandwidth, hence what? Client gets for example 80% of he pays. He complains and you are fired as incompetent!
2) Reflection of lost power coming back will be used based on some propability distribution rules as noise in circuit spontaneously without your control of it and you having no control of it.
etc.
So match it!
Hi djalli,
I had same understanding as yours days before, but it is not correct. You may mix up conjugate matching for max power transfer and reflectionless matching for min reflection.
Pls check the chapter of "Electromagnetic Waves and Antennas" (https://www.ece.rutgers.edu/~orfanidi/ewa/)
https://www.ece.rutgers.edu/~orfanidi/ewa/ch11.pdf
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