ELECTRONICS II

ING-INF/01 - 9 CFU - 1° Semester

Teaching Staff

GIANLUCA GIUSTOLISI


Learning Objectives

The objective of this course is the analysis, the simulation and the design of feedback circuits with particular emphasis on single and multi-stage amplifiers. The course will highlight the design of circuits in CMOS technology thus leading the student through the comprehension of the main single-transistor circuit configurations (common source, common drain and common gate) and of the multiple-transistor ones (current mirrors, cascode amplifiers and differential amplifiers). The student will also know the static and dynamic properties of the feedback circuits as well as the techniques for circuit analysis and design. The course will be completed by some common-used topologies of amplifiers for integrated technology.

At the end of the course the students will be able to analyze the behavior of a feedback circuit by means of a "pencil-and-paper" analysis and to simulate its main characteristics. Students, with the aid of the computer, will also be able to design the compensation network of a feedback circuit with one or two gain stages and to design the most common topologies of integrated amplifiers. Students will also be trained to the design through the use of the LTSpice simulator.

Students should have prior knowledge about Laplace transform, Bode plots and methods for the analysis of linear circuits. They are also required to have prior knowledge about the modeling of common electronic devices (diodes, BJTs and MOSFETs), as well as the ability in the analysis of simple circuits with active elements.


Course Structure

The course includes lectures and numerical exercises also with the help of the SPICE circuit simulator. These will be aimed at putting into practice, developing and consolidating the theoretical contents and the design techniques learned. During the course a number of computer exercises will be proposed to small student workgroups. Finally, seminars will be organized by researchers and designers from industries operating in the microelectronics sector.



Detailed Course Content

Bipolar transistor models
The pn junction. BJT forward active region. Large-signal dc models. Operating modes. Small-signal models. Parasitic elements.

MOS transtor models
MOS structure and operating regions. MOSFET operating regions. MOSFET I-V characteristic. Large-signal dc models. Small-signal models.

Basic MOSFET circuits
MOSFETs’ external resistances. Single-transistor circuits(CS, CD and CG). Current mirrors. Differential amplifiers. High-gain stages.

Frequency response
General amplifiers' structure. Seeking poles and zeros. Single transistor stages: CS, CD and CG. Current mirrors. Differential pair. High-gain stages.

Amplifiers dc analysis
General amplifiers' structure. Feedback. Two-port theory. Return ratio. Rosenstark method. Blackman method

Amplifiers ac analysis
Feedback amplifiers' general characteristics. Stability analysis. Stability criteria. Compensation techniques.

Voltage and current reference circuits
Voltage/Current reference parameters. Current reference circuits. VBE vs T modeling. Bandgap voltage reference circuits: Widlar, Brokaw, Kuijk and Banba.

Operational Transconductance Amplifiers (OTAs)
Two-stage class-A OTA. Stacked mirrors OTA. Folded cascode OTA

The SPICE simulator
Design of electronic circuits by means of SPICE



Textbook Information

  1. Gray, Hurst, Lewis, Meyer, Analysis and design of Analog Integrated Circuits, 5th Ed., John Wiley & Sons, Inc.
  2. P. R. Gray, R. G. Meyer, Circuiti Integrati Analogici, II Edizione, McGraw-Hill
  3. J. Millman & A. Grabel, Microelectronics, McGraw-Hill.
  4. Alan B. Grebene, Bipolar and MOS Analog Integrated Circuit Design, John Wiley & Sons, Inc.
  5. A. Vladimirescu, Guida a SPICE, McGraw-Hill Libri Italia.



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