commit 5137756fa26427aa025e66af10b8345a767259bc
author atorkmabrains <74936860+atorkmabrains@users.noreply.github.com> Wed Oct 27 14:43:37 2021 +0200
committer GitHub <noreply@github.com> Wed Oct 27 14:43:37 2021 +0200
tree 51a566c43d234360bf2b033ac8245b5424d919d7
parent 60b52eccbdfbcde3f63805e2f8b093707c91cf77

Update README.md

README.md

diff --git a/README.md b/README.md
index 5b9def7..d287e39 100644
--- a/README.md
+++ b/README.md
@@ -8,28 +8,28 @@
 ## Circuit Design
 The implementation of the LDO is as follows
 
-## LDO Simulation
-
-We have an enable switch so all the following analysis when the enable signal is high.
-
-## Schematic
+### Schematic
 
 ![Image of LDO schematic](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/Testbench_schematic.png)
 
-## Error Amplifier 
+### Error Amplifier 
 
 ![Image of LDO_Error amplifier](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/Error_Amp.png)
 
-## Bandgap
+### Bandgap
 
 ![Image of LDO_BGR](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/Bandgap_symbol.png)
 
 
-## a. DC analysis
+## LDO Simulation
+
+We have an enable switch so all the following analysis when the enable signal is high.
+
+### a. DC analysis
 
 We used dc analysis for displaying the operating point for proper biasing of transistors and also dc sweep of output voltage against variations in supply and temprature to calculate dropout voltage,line regulation,temperature coefficient.
 
-## Supply variation
+### Supply variation
 We made dc sweep on the supply and plotted voltage of the output node and vdd node overlaid on the same plot
 @Load current = 0.1mA
 ![Image of LDO_Vout_vs_Vin](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/vddsweep100u.png)
@@ -40,7 +40,7 @@
 @Load current = 100mA
 ![Image of LDO_Vout_vs_Vin](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/vddsweep100m.png)
 
-## Temperature variation
+### Temperature variation
 We made dc sweep on temperature from 0 to 85°C and plotted the output voltage vs temperature from which we found temperature coeffiecient in ppm/°C.
 @Load current = 100uA
 ![Image of LDO_Vout_vs_Vin](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/tempvar100u.png)
@@ -48,36 +48,36 @@
 @Load current = 10mA
 ![Image of LDO_Vout_vs_Vin](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/tempvar100u.png)
 
-## c. AC analysis
-## PSRR
+### c. AC analysis
+#### PSRR
 We used AC analysis by injecting small ac signal over the supply and plotted the output voltage in dB which refers to the PSRR vs Frequency.
 
 ![Image of LDO_PSRR](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/psrr50u.png)
-## Stability analysis
+### Stability analysis
 We made the above testbench to cut the feedback loop of the ldo and inject ac signal and then measure the loop gain and phase to find phase margin.
 ## d. Transient analysis
 
-## Line Transient 
+#### Line Transient 
 We used transient analysis to show the line transient by varying the supply from 0 to vdd where the nominal supply voltage is 2.3v.
 When VDD varies from 0 to 2.3v
 ![Image of LDO_Transient](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/tran02.3v.png)
 When VDD varies from 2 to 3v
 ![Image of LDO_Transient](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/line_tran_2v3v.png)
 
-## Load Transient 
+#### Load Transient 
 The load is varied from 0.1mA to 10mA where the load is modeled as current source varied as PWL source where the output voltage suffers from under shoot of 40mV due to change of load current from 0.1mA to 10mA in 10uS then it settles back to its original value so we used this analysis to measure the load regulation. 
 
 The plot includes load current variation and ac-coupled ldo_output overlaid on the same plot.
 ![Image of LDO_netlist](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/load_transient_ac_coupled.png)
 
-## Turn-on Characteristic
+#### Turn-on Characteristic
 We have an enable signal so we varied it from 0 to Vin in 0.1uS and plotted the ldo_out. The start up time is less than 10uS.
 ![Image of LDO_netlist](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/stup_50m.png)
 
-## e. Testbench netlist
+### e. Testbench netlist
 ![Image of LDO_netlist](https://github.com/mabrains/Analog_blocks/blob/main/Analog_Blocks/LDO/Images/LDO_v2/TB.png)
 
-## Simulation results
+### Simulation results
 The typical conditions are tt corner ,load of 50uA, T=27°C , VDD=2.3V , We have a script to automate running process corners then getting their statistical distribution where the variation of the load from 50uA till 100mA is included in the corners  
 
   Specification  |      TT