[Amps] Amplifier classes in solid state

[G3rzp@aol.com]

In a message dated 27/03/2005 18:57:15 GMT Standard Time, craxd1 at ezwv.com  
writes:

To me, I  cant see any difference in the action of a triode or a transistor 
if the  transistor is biased correctly.



The main difference is the way the collector/drain/plate current varies  with 
collector/drain/plate voltage for fixed bias. The solid state devices are  
nearer to pentode characteristics in this respect - until you get to sub-micron  
CMOS run in weak inversion, where they are nearer triodes. That condition  
certainly doesn't apply to power amplifiers - which in this case, means anything 
 over 100 microwatts! (Yes, I do mean microwatts!)
 
73
 
Peter G3RZP