What you'll learn
Basics of Analog comparator Circuit design and layout
Integrate Sky130 foundry PDKs with comparator circuit design
Basics of comparator hysteresis characteristics
Requirements
VSD - Circuit design and SPICE simulations
VSD - Custom layout
VSD Intern - Analog Bandgap Reference design using Sky130
Description
A comparator is a device that compares two analog inputs and outputs a digital signal indicating which input is larger. So it has two analog input terminals and one binary digital output. When the difference between two analog input signals approach zero, noise on the inputs will cause spurious switching of digital output. This rapid change in output due to noise can be prevented by hysteresis. Hysteresis is switching the output high or low at different input signal levels. In place of one switching point, hysteresis introduces two: one for rising edge, and one for falling edge of voltage or current. The difference between the higher-level trip value (VH) and the lower-level trip value (VL) equals the hysteresis voltage (HYST).A comparator can be divided into three distinctive pieces - a front-end differential amplifier, amplifier stage and output stage.This comparator consists ofFront-end differential amplifierAmplifier of the output from front-end differential sageNAND gate to act as buffer as well as incorporate the enable pinInverter to act as final buffer before output. The NAND and Inverter improves the slew and provides a little gain.Positive feedback differential set-up.Various Comparator specifications are listed below:Propagation Delay -The time difference between the input crossing the reference voltage and the output changing the logic state. Generally, comparators are fast Input Offset -The difference between the input voltages at the instance where output voltage equals zero voltsGain-Ideal Comparator has infinite gain and output jumps from low to high at a specific difference in input voltage. Ideal comparators will have a linear transfer curve. There are multiple other parameters like output swing, Output type, input and output current and impedance but we will focus on above including hysteresis.This webinar will discuss all design, layout and specification details using ngspice, Xschem and Magic
Overview
Section 1: Introduction
Lecture 1 Introduction
Section 2: Tool Installation And Testing (LIVE Labs)
Lecture 2 Steps to install MAGIC
Lecture 3 Steps to install Sky130 PDK and NGSpice
Lecture 4 Steps to configure Xschem with Sky130 PDK
Lecture 5 Final Steps to patch Sky130 PDK with NGSpice and Xschem
Lecture 6 Xschem testing with Sky130 PDKs
Section 3: Comparator Circuit design and layout (LIVE Labs)
Lecture 7 Introduction To Comparator Circuit Components And Pre-layout Simulations
Lecture 8 Hysteresis And Simulation Stimulus
Lecture 9 Review EN, INP and IHyst Inputs
Lecture 10 Review Differential Stage Output - Vdiff
Lecture 11 Review Amplifier Output
Lecture 12 Impact Of Changing Differential Voltage On Common Mode
Lecture 13 Circuit To Layout Mapping
Lecture 14 Transistor Selection And Tech File Details
Section 4: Conclusion
Lecture 15 Post-Layout Simulation, Issues And FutureWork
Beginner who is curious to know about circuit design and layout,Physical Design Professionals curious to know about IP design


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