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Fusion916 20th December 2012 04:55 PM

Common emitter stage driving low hfe output stage
Say your output stage has a very high IQ for class A design (lets say 1 amp) but also has a low hfe of 80 (for example 2SC5200 STMicroelectronics | 497-10863-5-ND | DigiKey)

How do you go about driving this output stage without significant voltage drop (compared to an unloaded common emitter stage)?

Bigun 20th December 2012 05:05 PM

The driver should have low output impedance and ability to source current. Another emitter follower is the popular solution. a CFP can provide some advantages.

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