Differences

This shows you the differences between two versions of the page.

--- philpem:philips:sa572n [2023/12/21 01:02] – [Package] philpem
+++ philpem:philips:sa572n [2025/08/04 21:24] (current) – external edit 127.0.0.1
@@ Line 40: / Line 40: @@
 </code>
-{{https://siliconpr0n.org/map/philips/sa572n/single/philips_sa572n_philpem_bf20x_r.thumb.jpg}}
+{{https://siliconprawn.org/map/philips/sa572n/single/philips_sa572n_philpem_bf20x_r.thumb.jpg}}
-[[https://siliconpr0n.org/map/philips/sa572n/philpem_bf20x_r/|Brightfield, Olympus MSplan 20x]]
+[[https://siliconprawn.org/map/philips/sa572n/philpem_bf20x_r/|Brightfield, Olympus MSplan 20x]]
-  * [[https://siliconpr0n.org/map/philips/sa572n/single/philips_sa572n_philpem_bf20x_r.jpg|Single]] (25376x21760, 97.3794MiB)
+  * [[https://siliconprawn.org/map/philips/sa572n/single/philips_sa572n_philpem_bf20x_r.jpg|Single]] (25376x21760, 97.3794MiB)
+====== Circuit analysis notes ======
+  * The circuit is mirrored roughly down the centre.
+  * A 2.5V bandgap voltage reference is shared by both channels. This is likely the non-quite-symmetrical centre section.
+  * Bipolar process with extensive use of polysilicon resistors
+The [[https://www.onsemi.com/pdf/datasheet/sa571-d.pdf|SA571]] is a mono version of this chip. A SPICE model is available from [[https://modwiggler.com/forum/viewtopic.php?t=208611|jorg on the Mod Wiggler forums]], including a transistor-level schematic. This may make it easier to follow the circuitry on the IC.