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Old 21st March 2008, 12:23 AM   #1
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Default AD797 guts

Hi,

Could one of you guys (Scott Wurcer) explain the purpose of Q50/Q64 in AD797 simplified schematic, thank you?
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Old 21st March 2008, 07:46 AM   #2
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soft clipping, anti-saturation
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Old 21st March 2008, 12:52 PM   #3
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Thanks darkfenriz, I thought it is some kind of protection, but I can't figure out the mechanism of it, could you elaborate it a bit further?
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Old 21st March 2008, 05:02 PM   #4
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As far as I understand the circuit:
-at normal operation, both Q50 and Q64 are kept below threshold Vbe
-Q19 and I3 form the main, final VAS
-collector of Q17 drives the Q18 buffer and this drives Q19 VAS
- at positive overload Q17 collector to I3 upper node voltage gets high, here Q64 starts to conduct
- at negative overload Q50 conducts

I understand it as two anti-parallel diodes at current mirror.

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Adam
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