Analog IC Design – CMOS 2-stage Op-Amp Design

cmos analog ic design


Operational amplifier (Op-amp) is an essential building blocks in many analog electronic application. In fact, CMOS op-amp design is one of hottest research topic among analog IC designer.

This module aims to the participants with a broad knowledge and understanding of transistor level CMOS op-amp design. It covers the essentials building blocks that are commonly used in CMOS op-amp. Performance trade-off of conventional 2-stage CMOS op-amp in terms of power and GBW product will be discussed. Stability margin and frequency compensation techniques will also be covered in this course.

Course Outcome

Upon Completion of this Course, student should be able to:

  • Essential fundamental concepts in analog integrated circuit design
  • Identify the essential building block of a CMOS op-amp
  • Intuitive approach to op-amp design without complex equations

Targeted audience

  • Designers and engineers who is new to analog IC design.
  • Digital IC designers who would like to extend their knowledge on analog IC design which would benefits them from understanding the requirements and constraints faced by analog IC designers.
  • Project managers and application/ product/ marketing engineers who would like to enhance their knowledge on the current analog IC design methodology.

Course Outline

  1. Single-stage common-source amplifier analysis
    • Common-Source
    • Cascode configuration
    • Common-source with active load
    • Common-source with diode-connected load
  2. Current Source / Current Mirror
    • Basic current source
    • Cascode current source
    • Wide-swing cascode current source
  3. Differential amplifier
    • Differential pair with passive load
      • Differential-mode
      • Common-mode
  4. Classical 2-stage operational amplifier
    • DC biasing
    • Proper Transistor sizing
    • DC gain estimation
  5. Frequency compensation of op-amp
    • Phase and Magnitude response
    • Poles & Zeros concept
    • Stability margin
    • Frequency Compensation Techniques