add ratio-stability-principle chart

1 files changed, 8 insertions, 3 deletions

diff --git a/module-design.typ b/module-design.typ
index 4234f3d..c295094 100644
--- a/module-design.typ
+++ b/module-design.typ
@@ -2145,18 +2145,21 @@ This single drift component alone exceeds the Metrologic drift budget
 for two resistors with tempcos $alpha_A$ and $alpha_B$:
 
 $
-  (R_A (T)) / (R_B (T)) = (R_(A 0) (1 + alpha_a Delta T)) / (R_(B 0) (1 + alpha_B Delta T)) approx (R_(A 0))/(R_(B 0) [ 1 + (alpha_A - alpha_B) Delta T])
+  (R_A (T)) / (R_B (T)) = (R_(A 0) (1 + alpha_A Delta T)) / (R_(B 0) (1 + alpha_B Delta T)) approx (R_(A 0))/(R_(B 0) [ 1 + (alpha_A - alpha_B) Delta T])
 $
 
 The net ratio tempco is the tracking mistmatch $Delta alpha = alpha_A - alpha_B$.
 When matched resistors from the same batch are placed in close thermal
-proximity on the PCB, their tracking mismatch drops be $lt qty(1, "ppm per celsius")$
-even if individual tempcos are $qty(25, "ppm per celsius").$
+proximity on the PCB, their tracking mismatch drops would be
+$lt qty(1, "ppm per celsius")$ even if individual tempcos are
+$qty(25, "ppm per celsius").$
 
 Furthermore, monolithic thin-film resistor networks (multiple laser-trimmed
 resistors on a single ceramic substrate) achieve ratio tracking tempcos
 $lt qty(0.2, "ppm per celsius")$ ($qty(200, "ppb per celsius")$).
 
+#include "charts/ratio-stability-principle.typ"
+
 ====== Scaling law <resistor-tempco-scaling-law>
 
 - Absolute single-ended resistance drift scales linearly with temperature
@@ -2181,6 +2184,8 @@ $lt qty(0.2, "ppm per celsius")$ ($qty(200, "ppb per celsius")$).
   Periodically correct baseline gains against the system reference standard,
   which is ovenized to eliminate reference tempco effects.
 
+===== Resistor aging and load life <resistor-aging-and-load-life>
+
 == Error compensation strategies <error-compensation-strategies>
 
 == Advanced compensation topologies <advanced-compensation-topologies>