A request to all you gurus on this newsgroup. I am looking for a good tutorial, preferably with a design example, on multi-stage broadband impedance matching. Any pointers would be very helpful. Thanks in advance.
As a general rule the broader the impedance match the more components that you need to use. I don't know if you're doing all lumped or loved and distr ibuted or all distributed but nevertheless the concept Remains the Same. If you have a reasonable idea of the source impedance and the load impedance of the two amplifiers you ought to be able to play around with a RF program and empirically get there
3 decades? A typical amplifier has 60 db gain variation across 3 decades so the only thing that works is feedback. So I am speaking up...learn feedback. Like all of these posts, there is no general answer to a specific problem.
Well, transformers. And amplifiers, if you don't require passive solutions.
Broadband impedance matching isn't quite the same as the narrowband case. The circuit needs to be right, by default. Either the circuit is designed around system impedance in the first place, or transformers are used to match it. You can fudge the band edges (both HF and LF), using RLC impedance matching -- filtering -- but only by about an octave.
A principle that applies to the narrowband case as well -- that is, using higher order networks (giving tighter band skirts) to extend bandwidth modestly.
It's a little more math-heavy than some other introductory textbooks though so it doesn't hurt to brush up on a bit of calculus/linear algebra before heading in
I routinely use transmission line transformers to effect impedance matching over three decades of frequency between to real impedance levels. Sometimes, in specific cases, I can stretch that a bit. My record is six decades in a 25 to
100 ohm transformer. (Those are the easiest, usually, but not if you want 6 decades!) I've lost that ability with the demise of the required amorphous metal magnetic cores. Sigh.
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