2 - ECSE 334 Introduction to Microelectronics Roni Khazaka...

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ECSE334 – Introduction to Microelectronics ECSE 334 Introduction to Microelectronics Roni Khazaka Lecture #2
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ECSE334 – Introduction to Microelectronics 2 Khazaka - 2008 Integrated Circuits Design Constraints Key Design Goal: Reduce cost. Small chip area Small number of pins (terminals). Key Design Constraints: Large size of capacitor (no coupling and bypass capacitors) Large size of resistors (no bias resistors). Component variability N-channel devices offer better performance than p-channel devices.
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ECSE334 – Introduction to Microelectronics 3 Khazaka - 2008 Integrated Circuits Design Characteristics Circuit topologies that use transistors only (minimize the use of passives). Circuit topologies that rely on the performance of n-channel devices rather than p-channel devices. Circuit topologies that rely on component matching and parameter ratios rather than absolute values. The use of feedback for stable reliable designs.
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ECSE334 – Introduction to Microelectronics 4 Khazaka - 2008 Integrated Circuits Considerations Classical circuits use resistors for biasing and decoupling and bypass capacitors. These passive elements consume a lot of area on an IC, and there could be a lot of variations in their values. Biasing using current sources (current mirrors). Differential amps + Level shifting More transistors but IC transistors are cheap
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5 Khazaka - 2008 Current Mirrors R V DD I REF I o 0 0 0 () 2 1 1 2 1 t GS n D REF V v L W k I I = = I D1 ox n n C k μ = I D2 Q 1 Q 2 () 2 2 2 2 1 t GS n D o V v L W k I I = = ( ) () 1
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2 - ECSE 334 Introduction to Microelectronics Roni Khazaka...

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