On Wed, Sep 28, 2005 at 08:17:24AM -0400, Dan McMahill wrote: > Karel Kulhavy wrote: > >Hello > > > >Does ngspice noise model also work for operation of BJT with extremely > >small collector current? > > > >I got an idea to make low-noise amplifier by taking some 25GHz > >transistor and powering it with so small collector current that its > >transition frequency would drop down to 300MHz and then using it in > >Ronja preamplifier instead of 2N3904. As second or even first stage > >of the preamp. > > Why use an RF transistor? The only reason I'd see for this is if > thermal noise due to base resistance were your limiting factor.
Because only RF transistor has transition frequency of 25GHz. CL<
