VSD Intern - Analog Bandgap Reference design using Sky130
What you'll learn
- Basics of analog VLSI design
- General purpose bandgap reference design using Sky130
- Circuit design and layout concepts using Sky130
- VSD - Circuit design and SPICE simulations
- VSD - Custom Layout
This webinar provides detail about General Purpose Bandgap Reference. The basic working principle of Bandgap reference circuits is explained . The circuit implementation is discussed and the issues with each implementation style is mentioned. Index Terms—Bandgap Reference, CTAT, PTAT, Current mirror, OpAmp.
A Bandgap Reference is a circuit which gives a constant voltage output Vref irrespective of temperature, process and supply voltage variations. It is an especially important component of several analog and mixed signal Integrated Circuits. Several circuits such as LDO, ADC, DAC, Buck convertor. use Bandgap reference as a building block. It provides a constant output reference voltage of 1.2V which is proportional to the Bandgap energy of Silicon(1.2eV)at 0K and hence, gets its name as Bandgap Reference circuit
For detailed information regarding the Bandgap Reference circuit, refer to VLSI System Design website. Below are the details we will be covering in this webinar
Performance parameters and Circuit implementation of Bandgap Reference IP
Block Diagram and Schematic
Steps to download tools on your System
Pre-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
BGR Layout using Magic
Hope you enjoy the webinar
Who this course is for:
- Beginner electronics and telecommunications engineer looking to enter in analog VLSI domain
- Professional Physical design and SoC designers who are curious to know about Analog IPs used in their designs
Kunal Ghosh is the Director and co-founder of VLSI System Design (VSD) Corp. Pvt. Ltd. Prior to launching VSD in 2017, Kunal held several technical leadership positions at Qualcomm's Test-chip business unit. He joined Qualcomm in 2010. He led the Physical design and STA flow development of 28nm, 16nm test-chips. At 2013, he joined Cadence as Lead Sales Application engineer for Tempus STA tool. Kunal holds a Masters degree in Electrical Engineering from Indian Institute of Technology (IIT), Bombay, India and specialized in VLSI Design & Nanotechnology.
Hands on with Technology @
1) MSM (mobile station mode chips) - MSM chips are used for CDMA modulation/demodulation. It consists of DSP’s and microprocessors for running applications such as web-browsing, video conferencing, multimedia services, etc.
2) Memory test chips - Memory test chips are used to validate functionality of 28nm custom/compiler memory as well as characterize their timing, power and yield.
3) DDR-PHY test chips - DDR-PHY test chips are basically tested for high speed data transfer
4) Timing and physical design Flow development for 130nm MOSFET technology node till 16nm FinFET technology node.
5) “IR aware STA” and “Low power STA”
6) Analyzed STA engine behavior for design size up to 850 million instance count ACADEMIC
1) Research Assistant to Prof. Richard Pinto and Prof. Anil Kottantharayil on “Sub-100nm optimization using Electron Beam Lithography”, which intended to optimize RAITH-150TWO Electron Beam Lithography tool and the process conditions to attain minimum resolution, use the mix-and-match capabilities of the tool for sub-100nm MOSFET fabrication and generate mask plates for feature sizes above 500nm.
2) Research Assistant to with Prof. Madhav Desai, to characterize RTL, generated from C-to-RTL AHIR compiler, in terms of power, performance and area. This was done by passing RTL, generated from AHIR compiler, through standard ASIC tool chain like synthesis and place & route. The resulting netlist out of PNR was characterized using standard software
1) “A C-to-RTL Flow as an Energy Efficient Alternative to Embedded Processors in Digital Systems” submitted in the conference “13th Euromicro Conference on Digital System Design, Architectures, Methods and Tools, DSD 2010, 1-3 September 2010, Lille, France”
2) Concurrent + Distributed MMMC STA for 'N' views
3) Signoff Timing and Leakage Optimization On 18M Instance Count Design With 8000 Clocks and Replicated Modules Using Master Clone Methodology With EDI Cockpit
4) Placement-aware ECO Methodology - No Slacking on Slack
Tips on order in which you need to learn VLSI and become a CHAMPION:
If I would had been you, I would had started with Physical Design and Physical design webinar course where I understand the entire flow first, then would have moved to CTS-1 and CTS-2 to look into details of how the clock is been built.
Then, as you all know how crosstalk impacts functioning at lower nodes, I would gone for Signal Integrity course to understand impacts of scaling and fix them. Once I do that, I would want to know how to analyze performance of my design and I would have gone for STA-1, STA-2 and Timing ECO webinar courses, respectively
Once you STA, there’s an internal curiosity which rises, and wants us to understand, what goes inside timing analysis at transistor level. To full-fill that, I would had taken Circuit design and SPICE simulations Part 1 and Part 2 courses.
And finally, to understand pre-placed cells, IP’s and STA in even more detail, I would have taken custom layout course and Library Characterization course
All of above needs to be implemented using a CAD tool and needs to be done faster, for which I would have written TCL or perl scripts. So for that, I would start to learn TCL-Part1 and TCL-Part2 courses, at very beginning or in middle
Finally, if I want to learn RTL and synthesis, from specifications to layout, RISC-V ISA course will teach the best way to define specs for a complex system like microprocessor
Connect with me for more guidance !!
Hope you enjoy the session best of luck for future
I have a Masters in VLSI Systems Design from National Institute of Technology, Warangal. I have worked on projects related to both Analog and Digital VLSI Design. I have hands-on experience of working on 180nm and SKY130nm technology. I have a good understanding of Analog Electronics, Digital Electonics, CMOS Technology, RTL Design, Physical Design.