tailieunhanh - Circuits & Electronics P25

Violating the Abstraction Barrier Fall 2000 Lecture 25 1 .Case 1: The Double Take Problem “0” “1” Vi R VO expected observed VO “1” VO “1” huh? “0” t t “0” in forbidden region! Fall 2000 Lecture 25 2 .(a) DC case R Vi VO V1 very high impedance, like open circuit Vi = 5V DC VO = 5V DC V1 = 5V DC OK Fall 2000 Lecture 25 3 .(b) Vi Step R VO V1 very high impedance, like open circuit 5V Vi 0V t=0 VO t 5V VO = t=0 not ok! 2T t 5V V1 looks ok! t=0 T Fall 2000 Lecture 25 t 4 . R 5 Vi R→ characteristic impedance instantaneous R divider finite propagation speed of signals 5V 0 5V 0 2T 5V 0 T Fall 2000 Lecture 25 5 | CIRCUITS AND ELECTRONICS Violating the Abstraction Barrier Fall 2000 Lecture 25 1 Case 1 The Double Take in forbidden region Fall 2000 Lecture 25 2 a DC case R V I - V Vj very high impedance like open ------o-----------------o circuit V 5VDC VO 5VDC V1 5VDC---------- OK Fall 2000 Lecture 25

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