EMRFD Message Archive 14160
Message Date From Subject 14160 2017-07-21 12:30:35 aa0zz LTSPICE model for RD100HHF1 Hi, Does anyone out there have an LTSPICE model for an RD100HHF1 MOSFET? I have the model for the RD16HHF1 but would like it for the 100 as well. (Why on earth would I want the model for a 100 watt MOSFET? I'm not telling. :-) ) 73, -Craig, AA0ZZ 14161 2017-07-21 19:25:52 Daniel Mendes LTSPICE model for RD100HHF1
I found this:
Em 21/07/2017 22:44, email@example.com escreveu:
Fri Jul 21, 2017 12:30 pm (PDT) . Posted by:
Does anyone out there have an LTSPICE model for an RD100HHF1 MOSFET?
I have the model for the RD16HHF1 but would like it for the 100 as well.
(Why on earth would I want the model for a 100 watt MOSFET? I'm not
telling. :-) )
14162 2017-07-21 20:10:23 aa0zz Re: LTSPICE model for RD100HHF1 Thanks, Daniel,I should have mentioned that that's where I got the RD16HHF1 model. Claudio, IN3OTD provided these S-parameters for the RD100HHF1; however they are not all that's required for an LTSPICE model. I probably could have guessed, given the examples in the RD06HHF1 and the RD16HHF1 models but I would rather have the real values if possible.I Emailed Claudio, IN3OTD before I posted here and asked if he had the complete RD100HHF1 model. I didn't hear anything from him so I thought perhaps he was no longer active or I didn't have the correct Email address. Today, however, Claudio saw my posting here and remembered my Email so he contacted me by private Email and said he's working on the complete model. Wow - that's wonderful news. I'm anxiously waiting to see what a simulation looks like with this device. I've had fun simulating an amplifier using an RD16HHF1.73,-Craig, AA0ZZ 14163 2017-07-22 15:01:34 aa0zz Re: LTSPICE model for RD100HHF1 - Thanks To wrap up this thread/request, Claudio, IN3OTD, has graciously completed making the LTSPICE model for the RD100HHF1 MOSFET. It's here:http://www.qsl.net/in3otd/electronics/LDMOS_models/RD100HHF1/RD100HHF1_LTspice.htmlMany thanks!73,-Craig, AA0ZZ 14164 2017-07-23 01:47:16 radiog3xaq Re: LTSPICE model for RD100HHF1 Craig,When you said: "I've had fun simulating an amplifier using an RD16HHF1" does that imply you've investigated the amplifier both in simulations and on the bench? I'd be really interested to hear comparisons between the two. Where do the modelling and the real world diverge and by how much?Thanks,Alan G3XAQ 14165 2017-07-23 12:00:31 aa0zz Re: LTSPICE model for RD100HHF1 Hi Alan,Very good point.I have only modeled it so far, Started with a signal from a new version of my PIC-controlled Si570 signal generator, feeding into a W7ZOI Class AB buffer/amp (EMRFD Figure 2.93) and then into an RD16HHF1 and a W3NQN second-harmonic-optimized LPF. Model output looks really nice. This looks like a nice, clean way to get get about 15 watts CW out. Model's FFT says the second harmonic should be down about 55 dBc. I'm now building it and making tweaks to the PIC signal generator software as I go. Then I'll do the measurements. Like you, I'm very curious to see how closely the circuit matches the LTSPICE model.73,-Craig, AA0ZZ 14166 2017-07-24 02:07:39 gi0gdp Re: LTSPICE model for RD100HHF1 Never been a fan of Spice models for RF devices myself and would have thought the S-Params wouldbe much more useful.However having used these for 70 MHz (and this includes others in the series) i would imagine noneof the simulation tools would predict how woefully non linear these things can be at timesA recent 100 watt HF rig measured 3rd order distortion products some 10 dB below PEP @ 50 MHz from memory (in fact it may well have been below the carriers).So yes it will be interesting.cheersGeoffGI0GDP