VSD Intern - DAC IP design using Sky130 PDKs - Part 3

Name: VSD Intern - DAC IP design using Sky130 PDKs - Part 3
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10-bit DAC full layout design using Magic and Sky130 PDKs

Created byKunal Ghosh, Shalini Kanna

Last updated 5/2021

English

English [Auto],

What you'll learn

Analog VLSI Layout using MAGIC and Sky130 PDKs
DAC IP layout design fundamentals

Course content

6 sections • 21 lectures • 2h 31m total length

Introduction to DAC fundamentals6:10
Explore the digital-to-analog conversion in a DAC design using Sky130 PDKs, covering IP specifications, layout, and layout simulation, with emphasis on analog versus digital signals and performance evaluation.
Introduction to DAC IP Specifications6:04
Present the DAC IP specifications, detailing digital input and supply levels, digital ground, analog output bandwidth, reference voltage, bit-pattern mapping, and an accuracy target of about 0.09 percent.

Tool Installations9:14
Install and configure toolchains for Sky130 PDK workflows, including Skyland schematic design, Magic layout, Artemis open-source Sky130 BDK integration, and layout verification with a digital design and simulation step.
DAC Circuit Topology11:03
Examine a DAC circuit topology using transmission gates and inverters, detailing how input switches control node connections and how two inverters yield 3.3 V outputs.

CMOS Cross Sectional View5:40
Explore the CMOS cross-sectional view, detailing substrate selection, oxide and polysilicon gate formation, diffusion steps for source and drain regions, and masking for precise alignment.
Metal Layers9:48
Learn how metal layers in Sky130 PDKs govern layout rules, overlaps, and spacing, and how DRC checks detect violations to ensure reliable metal-to-metal connections and vias.
Resistor and Capacitor Layout Theory5:39
Explore resistor layout theory using diffusion-layer assistance, zigzag patterns, and alignment constraints to achieve target resistance, alongside capacitor basics, two-layer structures, and minicaps in Sky130 PDKs.
Magic tool Basics2:34
Master the magic tool basics for layout design: zoom, draw and fill selection boxes, measure areas, and apply the diffusion back layer.
Resistor Layout demo11:56
Design a resistor layout for a sky130 pdk register by placing diffusion contacts, defining local interconnects, labeling terminals, and generating extractor files for verification.
Capacitor Layout11:08
Design and lay out a compact capacitor in the Sky130 PDK, using metal layers and insulators, observe DRC clearance, extend geometry, and create ground and output terminals for simulation.

Inverter layout starting5:47
Learn inverter layout using Sky130 pdk, starting with substrate setup, polysilicon placement, and diffusion spacing to ensure correct cross-sectional mask design and reliable transistor layout.
Inverter Layout Continued7:53
Continue inverter layout by refining polysilicon and diffusion connections, ensuring proper spacing and avoiding DRC violations. Establish power and ground grids with contacts to connect diffusion.
Inverter Layout Complete8:22
Complete inverter layout design using Sky130 PDKs, ensuring proper diffusion contacts, polysilicon gates, and DNC-compliant spacing, with input and output wiring and net naming.
Switch Layout starting7:42
Watch a hands-on walkthrough of starting a switch layout by expanding an inverter demo, placing and wiring components to form a two-inverter transmission grid.
Switch Layout Complete6:35
Explore the completion of a switch layout for a DAC IP design using Sky130 PDKs, detailing transmission gates, connections, labeling, and SPICE simulations at 3.3 volts.

2Bit DAC to 10Bit DAC starting7:26
Explore wiring a 2-bit to 10-bit DAC using Sky130 pdk blocks, ensure proper grounding of switch inputs, and analyze parasitic capacitance to protect bandwidth and precision.
2Bit DAC to 10Bit DAC Complete6:30
Design and simulate a 2-bit to 10-bit DAC, using a library, adding voltages, and analyze output voltages with script commands and floor planning to manage area.
Output Response Evaluation4:06
Explore how to evaluate a DAC IP design using simulations, analyze step responses, and interpret outputs to refine design decisions based on observed performance.
DNL and INL theory3:59
Understand dnl and inl theory in DAC IP design using Sky130 PDKs, compare ideal versus actual outputs, and assess deviation via simulations to ensure accuracy.
DNL and INL Calculations10:57
Explore DNL and INL calculations for a DAC IP design using Sky130 PDKs, including data-point reduction, octave-based analysis, and comparing ideal vs actual voltages.

Requirements

VSD - DAC IP design using Sky130 PDKs - Part 1 & 2
VSD - Custom Layout
VSD - Circuit Design and SPICE simulations

Description

The webinar aims to do analog layout design of a 10-bit potentiometric Digital to Analog Converter, from scratch, using Magic and Sky130 PDKs. The target is to layout and generate GDS for 10-bit potentiometric DAC with 3.3v analog voltage, 1.8v digital voltage and 1 off-chip external voltage reference. This is a follow-up webinar of "VSD Intern - DAC IP design using Sky130 PDKs - Part 2" conducted by Harshitha Basavaraju

In real world, most of the data available is in the form of analog in nature. We have two types of converters analog to digital converter and digital to analog converter. These two converting interfaces are essential to obtain the required operations of a processor to manipulate the data of digital electronic equipment and an analog electric equipment. Digital to Analog Converter (DAC) is a device that transforms digital data into an analog signal in order to interact with the real world. The digital signal is represented with a binary code, which is a combination of bits 0’s and 1’s. The digital data can be produced from a microprocessor, Field Programmable Gate Array (FPGA), or Application Specified Integrated Circuit (ASIC). There are two commonly used DAC conversions – Weighed resistors method and R-2R ladder network method. Applications of a DAC: audio amplifier, video encoder, display electronics, data acquisition systems, calibration, Digital potentiometer.

This webinar will cover:

Introduction

Introduction to DAC fundamentals
Introduction to DAC IP Specifications

DAC IP design basics and tool installation

Tool Installations
DAC Circuit Topology

Basics of DAC IP Layout

CMOS Cross Sectional View
Metal Layers
Resistor and Capacitor Layout Theory
Magic tool Basics
Resistor Layout demo
Capacitor Layout

Inverter and switch layout LIVE Labs

Inverter layout starting
Inverter Layout Continued
Inverter Layout Complete
Switch Layout starting
Switch Layout Complete

10-bit DAC layout design and post-layout analysis

2Bit DAC to 10Bit DAC starting
2Bit DAC to 10Bit DAC Complete
Output Response Evaluation
DNL and INL theory
DNL and INL Calculations

Who this course is for:

Beginner or fresher looking to start career in analog VLSI design
Professional Physical Design engineers looking to know more about IP design or IP blocks which they use as black box

VSD Intern - DAC IP design using Sky130 PDKs - Part 3

What you'll learn

Explore related topics

Course content

Introduction2 lectures • 12min

DAC IP design basics and tool installation2 lectures • 20min

Basics of DAC IP Layout6 lectures • 47min

Inverter and switch layout LIVE Labs5 lectures • 36min

10-bit DAC layout design and post-layout analysis5 lectures • 33min

Conclusion1 lecture • 3min

Requirements

Description

Who this course is for: