[time-nuts] Fury Interface Board simulation results

[Rex]

Thanks, Bruce, for the circuit. I don't recognize the transformer 
numbers in your schematic. Can you tell us more about the nature of the 
transformers you have specified?


Bruce Griffiths wrote:
> George
>
> The circuit schematic for a BJT version of the JFET frequency is attached.
> The biasing is a little more complex as it is necessary set each
> frequency doubler BJT collector current at about 1mA or so to maximise
> conversion gain.
> The input impedance  is also around 50 ohms.
> Have also minimised the number of different component values used.
> Other transistors may be substituted but some care is required as the 
> reverse voltage across the base emitter junction is about 2V for a
> +13dBm input.
> Some filtering of the output waveform is required.
> The intended output load is 50 ohms.
>
> The 200 ohm emitter series resistors together with the transformed
> source impedance ensure that there is sufficient degeneration to keep
> the phase noise low.
>
> Obtaining suitable transistors for this circuit should be much easier
> than obtaining suitable JFETS for the JFET doubler.
>
> Whilst a diode doubler (at higher frequencies this may be the only
> sensible option) could be used it would need both an input amplifier and
> an output amplifier.
>
> Bruce
>   
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