68262071-Current-Mirror-Cadence

68262071-Current-Mirror-Cadence - Laboratory Manual ELEN...

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Laboratory Manual ELEN 474: VLSI Circuit Design Department of Electrical Engineering Texas A&M University Prepared by: Paul M. Miller IV (2010) John S. Mincey (2008) Terry L. Mayhugh, Jr. (1996,1997) Antonio F Mondragon (1998) Dr. Jose Silva-Martinez Dr. Jose Pineda de Gyvez Fall 2010
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i Table of Contents Lab 0: Introduction . ............................................................................................................ 1 Lab 1: Introduction to Cadence. .......................................................................................... 3 Lab 2: Layout Design. ....................................................................................................... 18 Lab 3: More Layout Techniques . ...................................................................................... 27 Lab 4: MOS Device Characterization . .............................................................................. 30 Lab 5: Current Mirrors . ..................................................................................................... 36 Lab 6: Inverting Amplifiers . ............................................................................................. 42 Lab 7: Differential Pairs. ................................................................................................... 53 Lab 8: Operational Transconductance Amplifiers . ........................................................... 63 Lab 9: 2 Stage Miller OTA . .............................................................................................. 69
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1 Lab 0: Introduction This laboratory complements the course ELEN 474: VLSI Circuit Design. The lab manual details basic CMOS analog integrated Circuit design, simulation, and testing techniques. Several tools from the Cadence Development System have been integrated into the lab to teach students the idea of computer aided design (CAD) and to make the analog VLSI experience more practical. To fully appreciate the material in this lab course, the student should have a minimal background with the following computer systems, equipment, and circuit analysis techniques. Students should be familiar with the UNIX operating system. Previous experience using a SPICE-like circuit simulator is also important. This course does not explain the various SPICE analyses and assumes the student is capable of configuring the appropriate SPICE analysis to obtain the desired information from the circuit. Finally, the student should have general familiarity with active circuit “hand” analysis. All of these prerequisites are satisfied by having credit for ELEN 325 and ELEN 326. The lab manual develops the concepts of analog integrated circuit design in a bottom-up approach. First, the basic devices of CMOS circuit design, the NMOS and PMOS transistors, are introduced and characterized. Then, one or more transistors are combined into a subcircuit such as a differential pair, current-mirror, or simple inverter and these small circuits are analyzed. Finally, these subcircuits are connected to form larger circuits such as operational transconductance amplifiers and operational amplifiers, and the idea of design methodologies is developed. Continuing with the bottom-up approach, these circuits can be combined to form systems such as filters or data converters (not currently covered in this course). The following figure illustrates the bottom-up approach used in the laboratory. Filter OTA Op-Amp Inverter Differential Pair Current Mirror N-MOST P-MOST Figure 0-1: Bottom-Up Approach
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2 The lab activities will generally be one week labs. However there will be some longer labs toward the end that will be two week labs. Before the lab, the student should read through the lab description and perform the pre-lab exercises. Generally, the pre-lab exercises are the “hand” design for the circuit being studied. During the lab students will perform circuit simulations to verify their hand calculations. Tweaking circuit
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68262071-Current-Mirror-Cadence - Laboratory Manual ELEN...

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