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