tailieunhanh - Circuits & Electronics P11

Small Signal Circuits Fall 2000 Lecture 11 1 .Review: Small signal notation vA = VA + va total operating point small signal vOUT = f (vI ) d f (vI ) ⋅ vi vout = dv I v I =VI VS vI = VI + vi vi VI RL + – + – Lecture 11 vO = VO + vo Fall 2000 2 .Review: I Graphical view (using transfer function) vO behaves linear for small perturbations vI Fall 2000 Lecture 11 3 .Review: II Mathematical view K (vI − VT ) vO = VS − RL 2 2 V − K (v − V )2 R T L d S 2 I vo = dv I v I =VI ⋅. | CIRCUITS AND ELECTRONICS Small Signal Circuits Fall 2000 Lecture 11 1 Review Small signal notation A VA Va total operating small point signal VOUT f V vout rf VI dVj v VI V tKs V V VI Vi V Rl 0 VO VO Vo Fall 2000 Lecture 11 2 Review I Graphical view using transfer function Fall 2000 Lecture 11

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