tailieunhanh - Circuits & Electronics P22

Energy and Power Fall 2000 Lecture 22 1 .Why worry about energy? - small batteries good Today: How long will the battery last? in standby mode in active use Will the chip overheat and self-destruct? Fall 2000 Lecture 22 2 .Look at energy dissipation in MOSFET gates VS R + + vI – C vO – C: wiring capacitance and CGS of following gate Let us determine standby power active use power Let’s work out a few related examples first. Fall 2000 Lecture 22 3 .Example 1: V + – I R + V – Power V2 P = VI = R Energy dissipated in time T E = VIT Fall 2000 Lecture 22 4 .Example 1: for our gate VS RL vI high VS RL vO vI low vO RON VS P=. | CIRCUITS AND ELECTRONICS Energy and Power Fall 2000 Lecture 22 1 Why worry about energy small batteries good Today How long will the battery last in standby mode in active use Will the chip overheat and self-destruct Fall 2000 Lecture 22 2 Look at energy dissipation in MOSFET gates C wiring capacitance and CGS of following gate Let us determine standby power active use power Let s work out a few related examples first. Fall 2000 Lecture 22

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