Advanced Analog CMOS IC Design

    August 27-31, 2018
    Deadline for registration: July 14, 2018
    registration

    Course material will be distributed only if fees have been paid by the deadline for payment.

    MONDAY, August 27

    8:30-12:00 am MOS and Bipolar: Modes of Operation and Models Eric Vittoz
    1:30-3:00 pm Elementary Building Blocks Eric Vittoz
    3:30-5:00 pm Voltage References Eric Vittoz

    TUESDAY, August 28

    8:30-12:00 am
    & 1:30-5:00 pm
    Analog Functional Blocks Willy Sansen

    WEDNESDAY, August 29

    8:30-12:00 am Continuous-Time Filters Boris Murmann
    1:30-5:00 pm CMOS Switched-Capacitor Circuit Design Boris Murmann

    THURSDAY, August 30

    8:30-10:00 am CMOS Switched-Capacitor Circuit Design (Continued) Boris Murmann
    10:30-12:00 am
    & 1:30-5:00 pm
    CMOS Off-Chip Drivers Rinaldo Castello

    FRIDAY, August 31

    8:30-12:00 am
    & 1:30-3:00 pm
    Technology and Other Limitations for Analog Design Herman Casier
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    Abstracts

    Advanced Analog CMOS IC Design
    August 27-31, 2018
    EPFL Premises, Lausanne, Switzerland

    MOS and Bipolar: Modes of Operation and Models
    Eric Vittoz, EPFL

    Since the MOS transistor is the basic component of device-level analog circuit design, a strong emphasis will be given on its basic theory: structure and definitions; calculation of surface field and potential, total charge, mobile inversion charge, pinch-off voltage, gate capacitance. An analytical core model requiring only 3 parameters will be derived, which conserves the inherent symmetry of the device and describes its large signal behavior from weak to strong inversion. Channel length modulation, short and narrow channel effects, small signal DC and AC models, temperature effects, noise and matching properties will then be presented. The bipolar transistor will be addressed more superficially, within the framework of CMOS technologies: Ebers-Moll model, large and small signal characteristics, noise, temperature effects, vertical bipolar in CMOS, bipolar operation of MOS transistors, special bipolar structures added in BiCMOS.

    Elementary Building Blocks
    Eric Vittoz, EPFL

    Current mirrors, differential pair, current references, analog switch, voltage gain cells, source follower, dynamic comparator, dynamic current mirror, principle of switched capacitors, current generation, voltage-to-current conversion, translinear circuits, log domain intagrator.

    Voltage References
    Eric Vittoz, EPFL

    "Built-In" voltages available in silicon. Circuits extracting thermodynamic voltage kT/q. Circuit extracting the bandgap voltage. Principle and properties of the bandgap voltage reference and its implementation in CMOS.

    Analog Functional Blocks
    Willy Sansen, KU Leuven

    The lectures start with an introduction on merits of MOSTs versus bipolar transistors in the different positions of an operational amplifier. Then the design procedures are given for optimal op-amp design by means of the pole-zero position and Bode diagrams. A second-order Miller op-amp is discussed in great detail followed by a design procedure for third-order nested Miller op-amps. All of them are optimized towards high GBW, low noise and minimum power consumption. Finally a considerable number of other configurations are discussed and compared, among which a few very-low-voltage fully-differential operational amplifiers, involving internal common-mode feedback.

    Continuous-Time Filters
    Boris Murmann, Stanford University

    Continuous-time filters play an important role in many communication systems and at the data conversion interface, where they are required for anti-aliasing and reconstruction. This module begins by reviewing the basic s-domain filter approximations and then looks into implementations strategies. We review active RC and gm-C topologies and study their imperfections and sensitivities to nonideal effects.

    Switched-Capacitor Interface Circuits
    Boris Murmann, Stanford University

    Discrete-time signals, Laplace and z-transform; Basic building blocks (opamps, switches, capacitors); Sample-and-hold circuits; SC integrators, bilinear filters and and biquads; SC amplifiers; Correlated double sampling and chopper stabilization; Nonideal effects and their correction.

    CMOS Off-Chip Drivers
    Rinaldo Castello, University of Pavia

    This lecture deals with circuits that are intended to realize the peripheral of some ASIC chip and therefore are optimized for a particular set of specifications. Different overall amplifier topologies are considered. In particular distinction is made between circuit with a DC feedback around the output stage and those that use only an ac feedback. The voltage follower as an output stage is considered together with some very linear configurations based on the follower. The common source push-pull as a large swing output stage is considered in great details. Gain, offset, linearity, speed and stability are analyzed for various possible implementations. Fully differential and more unconventional configurations are also shown. Finally, some examples of amplifiers realized in mixed technologies used in high voltage applications are given.

    Technology and Other Limitations for Analog Design
    Herman Casier, Consultant

    This module focusses on complementary aspects of analog design. It starts with an overview and comparison of different technology variations and families and includes a detailed comparison of bipolar and MOS transistors. The second part discusses analog design limitations beyond SPICE such as random and non-random parameter variations, device breakdown and degradation and environmental effects at chip level.

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