[Amps] Amplifier classes in solid state

[Will Matney]

Steve,

That's just what I thought. I knew mosfets were close to acting like a tube, and seems to me there was a specific type they termed tetrode action on one. Transistors should act similar to a triode, and by biasing the base, control the class of operation. After all, that's the way all the solid state amps work now. The classifications has nothing to do with the component type, but the way an amplifier stage acts and or works. Thanks for the reply.

Will

*********** REPLY SEPARATOR  ***********

On 3/27/05 at 7:09 PM Steve Thompson wrote:

>Will Matney wrote:
>> Hey all,
>>
>> I gotta ask this question;
>>
>> Is the amplifier classes A, AB1, AB2, B, and C valid for solid state
>> devices?
>>
>> Now my training says it is as the base of a semiconductor is the same
>> as the grid on a triode. There's the part about grid current flowing,
>> but of course we have base current flowing when running class AB1 or
>> A as the base is biased on with a regulator. To me, I cant see any
>> difference in the action of a triode or a transistor if the
>> transistor is biased correctly.
>>
>> Now, most know I'm a tube head instead of solid state when it comes
>> to RF amps. Am I missing the boat here and just dont see something?
>The class labels are used just the same, and are applied in similar
>situations. AB1 is usually used to describe class AB with low quiescent
>bias, AB2 with higher quiescent bias - you don't have the equivalent of
>'grid current' to measure.
>
>The gate on a MOSFET is a closer equivalent to the control grid, being open
>circuit, but still no equivalent to grid current flows.
>
>Steve
>
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