On Saturday 21 May 2005 04:44, Will Matney wrote:
> What the spec sheet says is this;
>
> "The ARF1505 is an RF power transistor designed for off-line 300V operation
> in very high power scientific, commercial, medical and industrial RF power
> generator and amplifier applications up to 40 MHz."
>
> On the webpage it says they are for;
>
> "INDUSTRIAL, SCIENTIFIC, MEDICAL (ISM) & HF COMMUNICATIONS"
>
> Notice it saying amplifier applications. On the linear portion, that would
> really be where you set the bias at. It should run fine at class A or AB
> service. Also, being for HF communications would have to be linear........
It might not be quite that simple. If I remember the app. note for the 50MHz
'linear', the IMD is always poor because the devices don't have a linear
transfer characterisitic - the power in/out curve is banana shaped, without a
straight line anywhere.
I've also seen instability where devices intended to be driven hard into
saturation for 'brute power' delivery are biassed for linear operation.
Steve
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