[Amps] increasing rf gain in driver stages ?

[R at contesting.com]

On Mar 15, 2006, at 6:59 PM, Dan Sawyer wrote:

> All,
>
> I have an older transistor based transceiver. I have separated the
> circuit and substituted an external signal generator in place of the
> internal circuit. The circuit drives a mixer, by varying the amplitude
> the mixer performs better with about a 4x increase in drive.
>
> My question is: what is the best way to increase the output of an
> amplifier stage?
>
> Is it as simple choosing a transistor with a higher beta?

More Beta decreases the amount of input/base current needed to produce 
the same output. More Beta does not increase the V-gain of the stage.  
In other words, more Beta raises the input Z.
>
> ...


Rich Measures, 805.386.3734, AG6K, www.somis.org