commit a1c73a2019bcf9f50142c21f5fdf3a3b53a2b689
author yrrapt <yrrapt@gmail.com> Fri Dec 18 22:57:00 2020 +0100
committer yrrapt <yrrapt@gmail.com> Fri Dec 18 22:57:00 2020 +0100
tree be431a2a430f6cc067fc5e044eb0b52d61f26913
parent 24010f28a1d75992585bbf1ee97d8f1a099d3b96
parent df247719963785ae90c3dc60ae70378cd858fa1b

Merge branch 'master' of https://github.com/yrrapt/caravel_amsat_txrx_ic

README.md

diff --git a/README.md b/README.md
index b1e549e..2ba4d3a 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,11 @@
 
 ### 1.3 - 3.6 GHz Fractional-N Phase Locked Loop
 
+
 ![pll](doc/vco_2-4GHz/vco_2-4GHz_layout.png)
+_VCO Layout_
+
+
 
 A S-Band phase locked loop employing a differential ring oscillator VCO with quadrature outputs. CML (Current Mode Logic) and flip-flop based pre-scaler dividers are used with a fractional-N divider which uses a 3rd order MASH structure with dithering. Finally a PFD (Phase Frequency Detector) is combined with a charge pump with off chip filtering to complete the loop.
 
@@ -18,9 +22,10 @@
 
 ### Bandgap
 
-![bandgap](doc/bandgap_trimmed/bandgap_trimmed_layout.png)
+![bandgap](doc/bandgap_trimmed/bandgap_trimmed.png)
+_Bandgap Layout_
 
-A bandgap reference with separate PTAT and CTAT currents. Provides less than variation from -40 to 125 degrees celcius.  6 bits of trimming on both PTAT and CTAT allows less than 1% accuracy over process variations.
+A bandgap reference with separate PTAT and CTAT currents. Provides less than +/-0.2% variation from -40 to 125 degrees celcius (tt simulation).  6 bits of trimming on both PTAT and CTAT allows less than 1% accuracy over process variations.
 
 
 ## Using the sources
@@ -58,4 +63,4 @@
 ```
 cd amsat_txrx_ic-caravel/utils
 ./run_drc amsat_txrx_ic-caravel
-```
\ No newline at end of file
+```