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|8th November 2018, 08:14 PM||#172|
Join Date: Mar 2008
Bet you had forgotten all about the lunchtime amp
It has been redesigned a little to run off higher voltage rails. +/- 59V for the front end and +/-47V for the output stage. The compensation has been re-tuned as well.
One thing that struck me is how close this compensation is to OITPC (Dadod). I could run an experiment and try OITPC but sims don't suggest any real gain. maybe the folded cascode isn't the ideal VAs to use with OITPC or maybe I am tuning the OITPC incorrectly.
The attached is almost an "as built" schematic. The main difference being the outut devices. The schematic has MJL4281 and MJL4302 whereas I have 2SA1386Y and 2SC3519Y. All front end transistors are matched and the LTP input transistors are a quad match.
The outut devices are currently running at 70mA each.
Attached are the usual plots etc. Current sources are JFET (2sk246).
More pictures will follow...
Last edited by mcd99; 8th November 2018 at 08:23 PM. Reason: Attachment name changes
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