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|29th April 2003, 05:23 AM||#41|
Join Date: Apr 2003
Location: Százhalombatta, Hungary
I agree with the first part of Your post. The base of the input device is connected to the ground.
What happend when we switch ON the amplifier?
1, Positive rail wake up first. There is no current from the tail. Transistors are switched off, base at 0V, collector at +rail.
2, Negativ rail first. There is no positive rail the collectors at 0V, base little less voltage due the emitter current.
In the PA amplifier the first stage is not the power amplifier input device. There is the balanced-unbalanced converter, or there is the limiter, or active bridgeing switch. But if You want to protect Your amplifier just use simple series resistor, and zeners to limit the input voltage.
For +rail RF modulation: If You use proper filtering, and good quality capacitors there is not possible to get 100% modulation. Few % is possible.
So my experience is: If You apply input device with 20% higher Vcemax, than Your positive rail, there will be no problem.
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