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. The Design specifications provided for avsdbgp_3v3 can be found here.
-
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
| 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 |
The files from this repository can be downloaded and used by the following commands :-
sudo apt install -y git
git clone https://github.com/an3ol/General-purpose-Bandgap-Reference-avsdbgp_3v3.git
The circuit implementation of Bandgap reference IP avsdbgp_3v3 is simulated using Ngspice to analyse its performance according to the Design Specifications provided.
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>
To simulate the files for Pre- Layout simulations
cd General-purpose-Bandgap-Reference-avsdbgp_3v3/Pre_Layout_Simulations/Circuits/
To observe the effect of temperature on the circuit, the temperature is varied from -40C to 140C. On the terminal window, type :-
ngspice temp_avsdbgp_3v3.cir
The output plot as obtained can be seen below :-
To observe the effect of Supply voltage on the circuit, the temperature is varied from 2V to 4V. On the terminal window, type :-
ngspice vdd_variation_avsdbgp_3v3.cir
The output plot as obtained can be seen below :-
On the terminal window, type :-
ngspice Temp_coeff_avsdbgp_3v3.cir
The output plot as obtained can be seen below :-
On the terminal window, type :-
ngspice voltage_coeff_avsdbgp_3v3.cir
The output plot as obtained can be seen below :-
On the terminal window, type :-
ngspice Start_up_avsdbgp_3v3.cir
The output plot as obtained can be seen below :-
On the terminal window, type :-
ngspice enable_current.cir
The output plot as obtained can be seen below :-
The Layout for the circuit was done using Magic Layout editor tool. To observe the layout, install magic using the following commands :-
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
After successful installation, type:-
cd General-purpose-Bandgap-Reference-avsdbgp_3v3/Layout/
magic -T ../libs/sky130A.tech BGR.mag
To simulate the files for Post-Layout simulations using ngspice :-
cd General-purpose-Bandgap-Reference-avsdbgp_3v3/Post_Layout_Simulations/Circuits/
To observe the effect of temperature on the circuit, the temperature is varied from -40C to 140C. On the terminal window, type :-
ngspice temp_avsdbgp_3v3.spice
The output plot as obtained can be seen below :-
To observe the effect of Supply voltage on the circuit, the temperature is varied from 2V to 4V. On the terminal window, type :-
ngspice vdd_variation_avsdbgp_3v3.spice
The output plot as obtained can be seen below :-
On the terminal window, type :-
ngspice Temp_coeff_avsdbgp_3v3.spice
The output plot as obtained can be seen below :-
On the terminal window, type :-
ngspice voltage_coeff_avsdbgp_3v3.spice
The output plot as obtained can be seen below :-
On the terminal window, type :-
ngspice Start_up_avsdbgp_3v3.spice
The output plot as obtained can be seen below :-
- Kunal Ghosh, Co-founder of VLSI System Design (VSD) Corp. Pvt. Ltd.
- Tim Edwards, Senior Vice President of Analog and Design at efabless corporation.
- Sheryl Corina Serrao, Undergraduate Student, Mumbai University.
- Anmol Purty - [email protected]
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent