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Old 29th June 2004, 06:22 PM   #1
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Default In Aleph & out Aloia... help

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How i can connect the input stage of aleph (left) to the output stage of Aloia (right)?
Can i connect the input stage of aleph directly in the input of the aloia power stage?

The bjt of aloia are MJE243-253, MJE15032-15033 and MJL3281-1302 and the mos of aleph are IRF9610!!
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Old 29th June 2004, 09:40 PM   #2
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You need a voltage gain stage, or at least a level shifter
to translate the inadequate -45V biased output of the input
stage to the power follower. Check out the topologies of the
A75 for some hints in that area - level shifting and/or folded
cascode.
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Old 30th June 2004, 05:59 AM   #3
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Old 30th June 2004, 06:15 PM   #4
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No, the output coming off R3 of the balanced input stage will
not have enough gain and voltage swing to do a decent job
of driving the output follower stage.

Anybody care to jump in here with an example schematic?
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Old 30th June 2004, 07:13 PM   #5
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Schematic of folded cascode ... for example :
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Old 30th June 2004, 07:30 PM   #6
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Old 1st July 2004, 06:30 AM   #7
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Thank's!! Grazie!
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Old 1st July 2004, 04:42 PM   #8
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Quote:
Originally posted by Nelson Pass
Check out the topologies of the
A75 for some hints in that area - level shifting and/or folded
cascode.

How work the A75 in class AB?
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Old 1st July 2004, 06:59 PM   #9
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Works fine, as long as the bias is healthy - say more than
1 amp.
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Old 2nd July 2004, 01:54 PM   #10
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What is the gain (unbalanced) of A75?
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