Chapter 4

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EE141 © Digital Integrated Circuits 2nd Wires 1 Digital Integrated Circuits A Design Perspective The Wire Bassam Jamil & Saed Abed EE141 © Digital Integrated Circuits 2nd Wires 2 The Wire transmitters receivers schematics physical Impact of wiring on circuit: - Increases area -Increases propagation delay -Impacts power dissipation -Introduces extra noise EE141 © Digital Integrated Circuits 2nd Wires 3 Wire Models All-inclusive model - Hard to analyze but accurate Capacitance-only -Simple and
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  EE141   © Digital Integrated Circuits 2nd Wires 1 Digital Integrated Circuits  A Design Perspective The Wire Bassam Jamil & Saed Abed  EE141   © Digital Integrated Circuits 2nd Wires 2 The Wire transmittersreceivers schematicsphysical Impact of wiring on circuit:  - Increases area  - Increases propagation delay  - Impacts power dissipation  - Introduces extra noise   EE141   © Digital Integrated Circuits 2nd Wires 3 Wire Models All-inclusive model -Hard to analyze but accurate Capacitance-only -Simple and easy to analyze-But it results in significanterrors in long wires orshort channel circuits.  EE141   © Digital Integrated Circuits 2nd Wires 4 Simplifying the Wire Model   Inductive effects can be ignored atthe current technologies.  In short wire, the resistance can beignored.  When neighboring wires are far,coupling capacitance can beingnored.
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