README.md - third_party/shuttle/sky130/mpw-002/slot-023 - Git at Google

 # General Purpose Bandgap Reference Circuit - avsdbgp_3v3_sky130_v2

 A Bandgap Reference is an analog circuit, which is used to provide a constant output reference voltage being independent of Temperature, Process and Supply voltage variations. The analog IP **avsdbgp_3v3** is a General Purpose Bandgap Reference ciruit, which is designed using **Sky130nm** technology in this project.

 For detailed information regarding the Bandgap Reference circuit click [here](https://github.com/vsdip/avsdbgp_3v3_sky130_v2/blob/main/Documents/General_purpose_BGR.pdf). The Design specifications provided for avsdbgp_3v3 can be found [here](https://github.com/vsdip/avsdbgp_3v3_sky130_v2/blob/main/Documents/Specifications.pdf).

 <p>&nbsp;</p>

 # Table of Contents
 * Performance parameters Bandgap Reference IP

 * Circuit Implementation of Bandgap Reference IP

   - Block Diagram of Bandgap Reference IP
   - Schematic of Bandgap Reference IP
 * Downloading the files on your System
 * Pre-Layout Simulation of Bandgap Reference IP circuit using Ngspice
   - Ngspice
   - Pre-Layout Simulation plots of Bandgap Reference IP circuit
   - Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
   - Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
   - Temperature Coefficient of Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
   - Voltage Coefficient of Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
   - Start-Up Time of Vbgp @ RL = 100M ohms plot
   - On-Off-Current of Vbgp wrt Enable @ RL = 100M ohms plot
 * BGR Layout
   - Magic
   - Layout
 * Post-Layout Simulation of Bandgap Reference IP circuit using Ngspice
   - Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
   - Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
   - Temperature Coefficient of Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
   - Voltage Coefficient of Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
   - Start-Up Time of Vbgp @ RL = 100M ohms plot
   - On-Off-Current of Vbgp wrt Enable @ RL = 100M ohms plot


 <p>&nbsp;</p>

 # Performance parameters of Bandgap Reference IP
 <p>&nbsp;</p>

 |  Parameter  |        Description             |    Min      |     Type    |    Max      |     Unit    | Condition  |
 |   :----:    |          :----:                |   :----:    |    :----:   |   :----:    |    :----:   |   :----:   |
 |    VBGP     | Output reference voltage       |   1.19490   |   1.19756   |   1.19764   |     Volt    | T= -40 to 140C, VDD=3.3V |
 |    VBGP     | Output reference voltage       |   1.11400   |   1.19756   |   1.21933   |     Volt    | VDD=2V to VDD=4V, T=27C |
 |     VDD     |      Supply Voltage            |             |     3.3     |             |     Volt    | T=-40C to 125C|
 |     IDD     |      Supply Current            |             |   21.9636   |             |      uA     |    EN=1    |
 |     IDD     |      Supply Current            |             |    24.4     |             |      pA     |    EN=0    |
 |     RL      |      Load Resistance           |             |     100     |             |      Mohm   |VDD=3.3V, T=27C|
 <p>&nbsp;</p>

 # Circuit Implementation of Bandgap Reference IP
 ## Block Diagram of Bandgap Reference IP
 ![Block diagram](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/photo/block_diagram.png)

 ## Schematic of Bandgap Reference IP
 <p>&nbsp;</p>

 ![Schematic](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/photo/Schematic.png)
 <p>&nbsp;</p>

 # Downloading the files on your System
 <p>&nbsp;</p>

 The files from this repository can be downloaded and used by the following commands :-
 >`sudo apt install -y git`

 >`git clone https://github.com/vsdip/avsdbgp_3v3_sky130_v2.git`
 <p>&nbsp;</p>

 # Pre-Layout Simulation of Bandgap Reference IP circuit

 The circuit implementation of Bandgap reference IP **avsdbgp_3v3** is simulated using Ngspice to analyse its performance according to the Design Specifications provided.
 <p>&nbsp;</p>

 ## Ngspice
 <p>&nbsp;</p>
 Ngspice is an open source mixed-signal circuit simulator. To install Ngspice on Ubuntu, open terminal window and type :-

 >`sudo apt-get install -y ngspice`

 After successful installation, to invoke Ngspice type the following command on the terminal window.
 >`ngspice <circuit file to be simulated>`

 <p>&nbsp;</p>


 ## Pre- Layout Simulation plots of Bandgap Reference IP circuit
 <p>&nbsp;</p>


 To simulate the files for Pre- Layout simulations
 <p>&nbsp;</p>

 >`cd avsdbgp_3v3_sky130_v2/Pre_Layout_Simulations/Circuits/`
 <p>&nbsp;</p>

 ## Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
 <p>&nbsp;</p>
 To observe the effect of temperature on the circuit, the temperature is varied from -40C to 140C. On the terminal window, type :-
 <p>&nbsp;</p>

 >`ngspice temp_avsdbgp_3v3.cir`
 <p>&nbsp;</p>
 The output plot as obtained can be seen below :-

 <p>&nbsp;</p>

 ![Vbgp vs Temperature](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/temp_var.png)
 <p>&nbsp;</p>


 ![Vbgp Vptat Vctat vs Temperature](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/temp_all.png)
 <p>&nbsp;</p>

 ## Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
 <p>&nbsp;</p>
 To observe the effect of Supply voltage on the circuit, the temperature is varied from 2V to 4V. On the terminal window, type :-
 <p>&nbsp;</p>

 >`ngspice vdd_variation_avsdbgp_3v3.cir`
 <p>&nbsp;</p>
 The output plot as obtained can be seen below :-
 <p>&nbsp;</p>

 ![Voltage vs Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/vdd_var.png)
 <p>&nbsp;</p>

 ## Temperature Coefficient of Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
 <p>&nbsp;</p>
 On the terminal window, type :-
 <p>&nbsp;</p>

 >`ngspice Temp_coeff_avsdbgp_3v3.cir`
 <p>&nbsp;</p>
 The output plot as obtained can be seen below :-
 <p>&nbsp;</p>

 ![Temperature coefficient of Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/temp_coeff.png)
 <p>&nbsp;</p>

 ## Voltage Coefficient of Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
 <p>&nbsp;</p>
 On the terminal window, type :-
 <p>&nbsp;</p>

 >`ngspice voltage_coeff_avsdbgp_3v3.cir`
 <p>&nbsp;</p>
 The output plot as obtained can be seen below :-
 <p>&nbsp;</p>

 ![Voltage coefficient of Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/vol_coeff.png)
 <p>&nbsp;</p>

 ## Start-Up Time of Vbgp @ RL = 100M ohms plot
 <p>&nbsp;</p>
 On the terminal window, type :-
 <p>&nbsp;</p>

 >`ngspice Start_up_avsdbgp_3v3.cir`
 <p>&nbsp;</p>
 The output plot as obtained can be seen below :-
 <p>&nbsp;</p>

 ![Start up circuit](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/Startup.png)
 <p>&nbsp;</p>

 ## On-Off-Current of Vbgp wrt Enable @ RL = 100M ohms plot
 <p>&nbsp;</p>
 On the terminal window, type :-
 <p>&nbsp;</p>

 >`ngspice enable_current.cir`
 <p>&nbsp;</p>
 The output plot as obtained can be seen below :-
 <p>&nbsp;</p>

 ![Enable](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/enable_current.png)
 <p>&nbsp;</p>

 # BGR Layout
 <p>&nbsp;</p>

 ## Magic

 The Layout for the circuit was done using Magic Layout editor tool. To observe the layout, install magic using the following commands :-
 <p>&nbsp;</p>

 >`sudo wget "http://opencircuitdesign.com/magic/archive/magic-8.3.122.tgz" `

 >`tar -xvzf magic-8.3.122.tgz`

 >` cd magic-8.3.122 `

 >`sudo ./configure`

 >`sudo make`

 >`sudo make install`
 <p>&nbsp;</p>

 ## Layout

 After successful installation, type:-
 <p>&nbsp;</p>

 >`cd avsdbgp_3v3_sky130_v2/Layout/`

 >` magic -T ../libs/sky130A.tech BGR.mag`
 <p>&nbsp;</p>

 ![Layout](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/photo/layout.png)
 <p>&nbsp;</p>

 # Post-Layout Simulation plots of Bandgap Reference IP circuit
 <p>&nbsp;</p>

 To simulate the files for Post-Layout simulations using ngspice :-

 >`cd avsdbgp_3v3_sky130_v2/Post_Layout_Simulations/Circuits/`
 <p>&nbsp;</p>

 ## Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
 <p>&nbsp;</p>
 To observe the effect of temperature on the circuit, the temperature is varied from -40C to 140C. On the terminal window, type :-
 <p>&nbsp;</p>

 >`ngspice temp_avsdbgp_3v3.spice`
 <p>&nbsp;</p>
 The output plot as obtained can be seen below :-

 <p>&nbsp;</p>

 ![Vbgp vs Temperature](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/temp.png)
 <p>&nbsp;</p>


 ![Vbgp Vptat Vctat vs Temperature](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/temp_all.png)
 <p>&nbsp;</p>

 ## Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
 <p>&nbsp;</p>
 To observe the effect of Supply voltage on the circuit, the temperature is varied from 2V to 4V. On the terminal window, type :-
 <p>&nbsp;</p>

 >`ngspice vdd_variation_avsdbgp_3v3.spice`
 <p>&nbsp;</p>
 The output plot as obtained can be seen below :-
 <p>&nbsp;</p>

 ![Voltage vs Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/vdd_var.png)
 <p>&nbsp;</p>

 ## Temperature Coefficient of Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
 <p>&nbsp;</p>
 On the terminal window, type :-
 <p>&nbsp;</p>

 >`ngspice Temp_coeff_avsdbgp_3v3.spice`
 <p>&nbsp;</p>
 The output plot as obtained can be seen below :-
 <p>&nbsp;</p>

 ![Temperature coefficient of Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/temp_coeff.png)
 <p>&nbsp;</p>

 ## Voltage Coefficient of Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
 <p>&nbsp;</p>
 On the terminal window, type :-
 <p>&nbsp;</p>

 >`ngspice voltage_coeff_avsdbgp_3v3.spice`
 <p>&nbsp;</p>
 The output plot as obtained can be seen below :-
 <p>&nbsp;</p>

 ![Voltage coefficient of Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/vol_coeff.png)
 <p>&nbsp;</p>

 ## Start-Up Time of Vbgp @ RL = 100M ohms plot
 <p>&nbsp;</p>
 On the terminal window, type :-
 <p>&nbsp;</p>

 >`ngspice Start_up_avsdbgp_3v3.spice`
 <p>&nbsp;</p>
 The output plot as obtained can be seen below :-
 <p>&nbsp;</p>

 ![Start up circuit](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/Startup.png)
 <p>&nbsp;</p>

 # Author
 * [Anmol Purty](https://github.com/an3ol)

 # Acknowledgements

 * [Kunal Ghosh](https://github.com/kunalg123), Co-founder of VLSI System Design (VSD) Corp. Pvt. Ltd.
 * [Tim Edwards](https://github.com/RTimothyEdwards), Senior Vice President of Analog and Design at efabless corporation.
 * [Sheryl Corina Serrao](https://github.com/sherylcorina), Undergraduate Student, Mumbai University.

 # Contact Information
 * Anmol Purty - nmlpurty@gmail.com
	# General Purpose Bandgap Reference Circuit - avsdbgp_3v3_sky130_v2

	A Bandgap Reference is an analog circuit, which is used to provide a constant output reference voltage being independent of Temperature, Process and Supply voltage variations. The analog IP avsdbgp_3v3 is a General Purpose Bandgap Reference ciruit, which is designed using Sky130nm technology in this project.

	For detailed information regarding the Bandgap Reference circuit click [here](https://github.com/vsdip/avsdbgp_3v3_sky130_v2/blob/main/Documents/General_purpose_BGR.pdf). The Design specifications provided for avsdbgp_3v3 can be found [here](https://github.com/vsdip/avsdbgp_3v3_sky130_v2/blob/main/Documents/Specifications.pdf).

	<p> </p>

	# Table of Contents
	* Performance parameters Bandgap Reference IP

	* Circuit Implementation of Bandgap Reference IP

	- Block Diagram of Bandgap Reference IP
	- Schematic of Bandgap Reference IP
	* Downloading the files on your System
	* Pre-Layout Simulation of Bandgap Reference IP circuit using Ngspice
	- Ngspice
	- Pre-Layout Simulation plots of Bandgap Reference IP circuit
	- Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
	- Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
	- Temperature Coefficient of Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
	- Voltage Coefficient of Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
	- Start-Up Time of Vbgp @ RL = 100M ohms plot
	- On-Off-Current of Vbgp wrt Enable @ RL = 100M ohms plot
	* BGR Layout
	- Magic
	- Layout
	* Post-Layout Simulation of Bandgap Reference IP circuit using Ngspice
	- Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
	- Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
	- Temperature Coefficient of Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
	- Voltage Coefficient of Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
	- Start-Up Time of Vbgp @ RL = 100M ohms plot
	- On-Off-Current of Vbgp wrt Enable @ RL = 100M ohms plot


	<p> </p>

	# Performance parameters of Bandgap Reference IP
	<p> </p>

	\| Parameter \| Description \| Min \| Type \| Max \| Unit \| Condition \|
	\| :----: \| :----: \| :----: \| :----: \| :----: \| :----: \| :----: \|
	\| VBGP \| Output reference voltage \| 1.19490 \| 1.19756 \| 1.19764 \| Volt \| T= -40 to 140C, VDD=3.3V \|
	\| VBGP \| Output reference voltage \| 1.11400 \| 1.19756 \| 1.21933 \| Volt \| VDD=2V to VDD=4V, T=27C \|
	\| VDD \| Supply Voltage \| \| 3.3 \| \| Volt \| T=-40C to 125C\|
	\| IDD \| Supply Current \| \| 21.9636 \| \| uA \| EN=1 \|
	\| IDD \| Supply Current \| \| 24.4 \| \| pA \| EN=0 \|
	\| RL \| Load Resistance \| \| 100 \| \| Mohm \|VDD=3.3V, T=27C\|
	<p> </p>

	# Circuit Implementation of Bandgap Reference IP
	## Block Diagram of Bandgap Reference IP
	![Block diagram](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/photo/block_diagram.png)

	## Schematic of Bandgap Reference IP
	<p> </p>

	![Schematic](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/photo/Schematic.png)
	<p> </p>

	# Downloading the files on your System
	<p> </p>

	The files from this repository can be downloaded and used by the following commands :-
	>`sudo apt install -y git`

	>`git clone https://github.com/vsdip/avsdbgp_3v3_sky130_v2.git`
	<p> </p>

	# Pre-Layout Simulation of Bandgap Reference IP circuit

	The circuit implementation of Bandgap reference IP avsdbgp_3v3 is simulated using Ngspice to analyse its performance according to the Design Specifications provided.
	<p> </p>

	## Ngspice
	<p> </p>
	Ngspice is an open source mixed-signal circuit simulator. To install Ngspice on Ubuntu, open terminal window and type :-

	>`sudo apt-get install -y ngspice`

	After successful installation, to invoke Ngspice type the following command on the terminal window.
	>`ngspice <circuit file to be simulated>`

	<p> </p>



	## Pre- Layout Simulation plots of Bandgap Reference IP circuit
	<p> </p>


	To simulate the files for Pre- Layout simulations
	<p> </p>

	>`cd avsdbgp_3v3_sky130_v2/Pre_Layout_Simulations/Circuits/`
	<p> </p>

	## Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
	<p> </p>
	To observe the effect of temperature on the circuit, the temperature is varied from -40C to 140C. On the terminal window, type :-
	<p> </p>

	>`ngspice temp_avsdbgp_3v3.cir`
	<p> </p>
	The output plot as obtained can be seen below :-

	<p> </p>

	![Vbgp vs Temperature](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/temp_var.png)
	<p> </p>


	![Vbgp Vptat Vctat vs Temperature](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/temp_all.png)
	<p> </p>

	## Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
	<p> </p>
	To observe the effect of Supply voltage on the circuit, the temperature is varied from 2V to 4V. On the terminal window, type :-
	<p> </p>

	>`ngspice vdd_variation_avsdbgp_3v3.cir`
	<p> </p>
	The output plot as obtained can be seen below :-
	<p> </p>

	![Voltage vs Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/vdd_var.png)
	<p> </p>

	## Temperature Coefficient of Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
	<p> </p>
	On the terminal window, type :-
	<p> </p>

	>`ngspice Temp_coeff_avsdbgp_3v3.cir`
	<p> </p>
	The output plot as obtained can be seen below :-
	<p> </p>

	![Temperature coefficient of Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/temp_coeff.png)
	<p> </p>

	## Voltage Coefficient of Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
	<p> </p>
	On the terminal window, type :-
	<p> </p>

	>`ngspice voltage_coeff_avsdbgp_3v3.cir`
	<p> </p>
	The output plot as obtained can be seen below :-
	<p> </p>

	![Voltage coefficient of Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/vol_coeff.png)
	<p> </p>

	## Start-Up Time of Vbgp @ RL = 100M ohms plot
	<p> </p>
	On the terminal window, type :-
	<p> </p>

	>`ngspice Start_up_avsdbgp_3v3.cir`
	<p> </p>
	The output plot as obtained can be seen below :-
	<p> </p>

	![Start up circuit](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/Startup.png)
	<p> </p>

	## On-Off-Current of Vbgp wrt Enable @ RL = 100M ohms plot
	<p> </p>
	On the terminal window, type :-
	<p> </p>

	>`ngspice enable_current.cir`
	<p> </p>
	The output plot as obtained can be seen below :-
	<p> </p>

	![Enable](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Pre_Layout_Simulations/Results/enable_current.png)
	<p> </p>

	# BGR Layout
	<p> </p>

	## Magic

	The Layout for the circuit was done using Magic Layout editor tool. To observe the layout, install magic using the following commands :-
	<p> </p>

	>`sudo wget "http://opencircuitdesign.com/magic/archive/magic-8.3.122.tgz" `

	>`tar -xvzf magic-8.3.122.tgz`

	>` cd magic-8.3.122 `

	>`sudo ./configure`

	>`sudo make`

	>`sudo make install`
	<p> </p>

	## Layout

	After successful installation, type:-
	<p> </p>

	>`cd avsdbgp_3v3_sky130_v2/Layout/`

	>` magic -T ../libs/sky130A.tech BGR.mag`
	<p> </p>

	![Layout](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/photo/layout.png)
	<p> </p>

	# Post-Layout Simulation plots of Bandgap Reference IP circuit
	<p> </p>

	To simulate the files for Post-Layout simulations using ngspice :-

	>`cd avsdbgp_3v3_sky130_v2/Post_Layout_Simulations/Circuits/`
	<p> </p>

	## Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
	<p> </p>
	To observe the effect of temperature on the circuit, the temperature is varied from -40C to 140C. On the terminal window, type :-
	<p> </p>

	>`ngspice temp_avsdbgp_3v3.spice`
	<p> </p>
	The output plot as obtained can be seen below :-

	<p> </p>

	![Vbgp vs Temperature](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/temp.png)
	<p> </p>


	![Vbgp Vptat Vctat vs Temperature](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/temp_all.png)
	<p> </p>

	## Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
	<p> </p>
	To observe the effect of Supply voltage on the circuit, the temperature is varied from 2V to 4V. On the terminal window, type :-
	<p> </p>

	>`ngspice vdd_variation_avsdbgp_3v3.spice`
	<p> </p>
	The output plot as obtained can be seen below :-
	<p> </p>

	![Voltage vs Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/vdd_var.png)
	<p> </p>

	## Temperature Coefficient of Vbgp v/s Temperature [ -40C - 140C] @ RL = 100M ohms plot
	<p> </p>
	On the terminal window, type :-
	<p> </p>

	>`ngspice Temp_coeff_avsdbgp_3v3.spice`
	<p> </p>
	The output plot as obtained can be seen below :-
	<p> </p>

	![Temperature coefficient of Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/temp_coeff.png)
	<p> </p>

	## Voltage Coefficient of Vbgp v/s VDD [ 2V - 4V] @ RL = 100M ohms plot
	<p> </p>
	On the terminal window, type :-
	<p> </p>

	>`ngspice voltage_coeff_avsdbgp_3v3.spice`
	<p> </p>
	The output plot as obtained can be seen below :-
	<p> </p>

	![Voltage coefficient of Vbgp](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/vol_coeff.png)
	<p> </p>

	## Start-Up Time of Vbgp @ RL = 100M ohms plot
	<p> </p>
	On the terminal window, type :-
	<p> </p>

	>`ngspice Start_up_avsdbgp_3v3.spice`
	<p> </p>
	The output plot as obtained can be seen below :-
	<p> </p>

	![Start up circuit](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/Post_Layout_Simulations/Results/Startup.png)
	<p> </p>

	# Author
	* [Anmol Purty](https://github.com/an3ol)

	# Acknowledgements

	* [Kunal Ghosh](https://github.com/kunalg123), Co-founder of VLSI System Design (VSD) Corp. Pvt. Ltd.
	* [Tim Edwards](https://github.com/RTimothyEdwards), Senior Vice President of Analog and Design at efabless corporation.
	* [Sheryl Corina Serrao](https://github.com/sherylcorina), Undergraduate Student, Mumbai University.

	# Contact Information
	* Anmol Purty - nmlpurty@gmail.com