Random Offset in CMOS IC Design - Designer’s Guide

Random Offset in CMOS IC DesignECEN4827/5827 Analog IC DesignOctober 19, 2007 Art Zirger, National to start? How do we choose what transistor sizes to use in a Design ? One topic not often discussed in classes is Random offsetand how transistor sizing affects this 2 devices (MOSFET s, resistors, capacitors) of the same size, laid out next to each other, are not identical. How they differ is generally the function of Random offsets during processing. These offsets vary from chip to chip and set a limit on precision attainable which is typically reflected as data sheet Definitions/Notation The following I-V equation for a MOSFET in saturation is used:where A mixture of Vt& VTis used where both are referring to threshold voltage, not thermal voltage()22tGSDVVI = LWCox =AgendaSystematic vs. Random offsetSources & profiles of Random offsetCurrent Mirror/Diff Pair Offset derivation & insightsPropagation of uncertainties mathCurrent Mirror/Diff Pair exercisesSystematic vs.

Oct 19, 2007 · Design ECEN4827/5827 Analog IC Design October 19, 2007 Art Zirger, National Semiconductor art.zirger@nsc.com 303-845-4024. ... • Differential Pairs and Current Mirrors operate with very different g m/I d (i.e. bias point) ratios to minimize mismatch errors: • Differential Pair:

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