Re: high frequency MHz and GHz range BJTtransistor or Mosfet
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LTspice is good up to frequencies where you need to use distributed elements, which I suppose is about 1 GHz. It's not intended to be an optimiser. Is there anything a Smith chart can do that LTspice matrix methods cannot? ? With best wishes DESIGN IT IN! OOO ¨C Own Opinions Only J M Woodgate and Associates Rayleigh England ? Sylvae in aeternum manent. ?
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From: LTspice@... [mailto:LTspice@...]
Sent: Thursday, August 4, 2016 5:34 PM
To: LTspice@...
Subject: [LTspice] Re: high frequency MHz and GHz range BJTtransistor or Mosfet? ? This is not exactly relate to the original question. My question is how useful is LTSpice for RF design? I was an RF engineer, we use Microwave Office and using Smith Chart for matching and gain. I don't see LTSpice can help much in designing RF circuits(tuned circuit). Particularly when use start using distributed elements ( using stripline or microstrip to simulate inductors and capacitors).
I am sure LTSpice can give you the answer if you fill in the values of the L R C, but it will not help you in optimizing the circuit which is the key for RF circuit. But you cannot guess the values.
I use LTSpice for RF transistors only for wide band circuits where smith chart is not particularly useful.
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