Re: high frequency MHz and GHz range BJTtransistor or Mosfet
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The 2n918, 2n5179, and the 2n2857 are still alive and well in Mouser database... they are still used...
On Wed, Aug 3, 2016 at 4:26 PM, tony@... [LTspice] <LTspice@...> wrote:
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Jim wrote: "Try a 2N918.?Small signal, but I think it is in the built-in LTspice library."
Sadly, this isn't in the standard.bjt file, and it would be long-obsolete anyway, along with the very similar 2N5179 (previously very popular in 1980s HP instruments) and the 2N2857. Fortunately, there are many modern devices from NXP, Infineon and Avago (now Broadcom, used to be HP and Avantek) that are considerably better and available with SPICE models and in proper (surface mount) RF packages.
Very few RF designers in the 1980s used SPICE at all, which is why there are few if any manufacturer-supplied models from this era; mostly, design was done with h- or s-parameters, which are linear frequency domain parameters. If you wanted non-linear data, you had to build a test circuit and measure it.
Regards, Tony
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