tailieunhanh - Circuits & Electronics P10

Amplifiers -Small Signal Model Fall 2000 Lecture 10 1 .Review MOSFET amp VS RL vO vI iDS Saturation discipline — operate MOSFET only in saturation region Large signal analysis 1. Find vO vs vI under saturation discipline. 2. Valid vI , vO ranges under saturation discipline. Reading: Small signal model -- Chapter 8 Fall 2000 Lecture 10 2 .Large Signal Review 1 vO vs vI vO = VS − K (vI −1)2 RL 2 valid for vI ≥ VT and vO ≥ vI – VT K 2 (same as iDS ≤ vO ) 2 Fall 2000 Lecture 10 3 .Large Signal Review 2 Valid operating ranges V S v O vO vI −VT vO = vI −VT vO . | CIRCUITS AND ELECTRONICS Amplifiers Small Signal Model Fall 2000 Lecture 10 1 Review MOSFET amp Fs Rl O----O Vo VI Q DS Saturation discipline operate MOSFET only in saturation region Large signal analysis 1. Find vO vs vI under saturation discipline. 2. Valid vI vO ranges under saturation discipline. Reading Small signal model -- Chapter 8 Fall 2000 Lecture 10 2 Large Signal Review vo vs Vj vo VS 2 vi -1 2 Rl valid for vI VT and VO VI- VT K 2 same as Îds 2 Vo Fall 2000 Lecture 10

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