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Old 20th December 2012, 04:55 PM   #1
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Default 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)?
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Old 20th December 2012, 05:05 PM   #2
Bigun is offline Bigun  Canada
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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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