From 2b552390082a295c1ae4a101e71c9f6553cb47a6 Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Sun, 13 Oct 2019 10:22:38 +0200
Subject: [PATCH] short description of the startup branch contents

---
 README.startup | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 README.startup

diff --git a/README.startup b/README.startup
new file mode 100644
index 000000000..710045aec
--- /dev/null
+++ b/README.startup
@@ -0,0 +1,15 @@
+Adding a startup (or ramp) time to independent voltage and current sources.
+
+By adding a flaG 'startup' to the 'tran' command, all independent current
+and voltage source outputs are scaled by the factor time/StartupTime if
+simulation time is smaller than StartupTime. Thus they are ramped up
+linearily between times 0 and StartupTime.
+
+The default value of 20us may be overridden by adding a line
+set startup_time = <value>
+to .spiceinit (or to the top of a .control script), where <value> may
+be any valid ngspice real number representing time. Negativ or 0 entries
+are ignored.
+
+Code changes include introducing a new mode flag MODESTARTUP and the
+scaling in vsrcload.c and isrcload.c.