Design of Analog CMOS Integrated Circuits


PROFESSOR

The course is taught by Professor Andrea Mazzanti at the University of Modena and Reggio Emilia.


DESCRIPTION

The course addresses the main aspects of design of analog circuits with scaled CMOS technologies.
More specifically, the students will learn the key aspects and challenges of analog circuit design cooping with the low supply, gain and dynamic range issues.
The course stars by reviewing the operation and modeling of the MOSFET with specific regard to analog design aspects. Long-channel and scaled short-channel devices are compared. Simple building blocks are then presented together with techniques for rapid hands estimation of (1) large and small signal performance (2) frequency response (3) noise and (4) linearity. Then, operational transconductance amplifiers (OTA) circuit topologies are presented with single and multi stages, single-ended or differential outputs.
Many practical activities (laboratory) are planned where students will learn the use of state-of-the art cad tools for analog design.
Attending the course, students will gain the competences required for selecting, analyzing and designing complex amplifiers circuits meeting a set of given electrical specifications.


PROGRAM

CMOS devices
Operation of the MOS transistor. Large and small signal equivalent circuits. Impact of device scaling on analog design.

Basic building blocks
Amplifiers with resistive loads: static large- and small-signal circuit analyses. Amplifiers with active loads: common source, cascode, super cascade, source follower and buffers. Current bleeding and folding. Differential amplifiers: operation principle, differential gain, common-mode responses with mismatches. Current mirrors: simple mirror, cascode and low voltage cascode mirror. Active current mirrors.

Frequency response, Noise and Linearity
Techniques for rapid estimation of the frequency response. Miller effect and association of poles to nodes. Gain bandwidth product of amplifiers. Noise sources in electronic devices and noise analyses of amplifiers. Linearity and dynamic range: definition and specification. Linearization techniques for amplifiers.

Operational Transconductance Amplifiers:
OpAmp and OTA. Main specifications and architecture. Circuit topologies for OTA: telescopic , folded-Cascode, mirrored, multi-stage. OTA with differential outputs and common-mode feedback. Stability and frequency compensation. Dominant pole and miller compensation techniques. Noise performance of OTA.

Laboratory
Introduction to CAD tools for analog IC design. DC,AC and transient simulations of electronic circuits. Design and characterization of simple building blocks. Design of an OTA.


TEACHING MATERIALS

A collection of additional teaching materials can be downloaded from here.