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problem 51p error or please explain

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Pupil
Karma Points: 55
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Date Posted: 7/18/2008 7:10:45 PM  Status: Live
problem 51p error or please explain
Course Textbook Chapter Problem
Digital Circuits Microelectronic Circuits (5th) by Sedra, Smith 6 51P
Question Details:
is Zin=Z/1-A then Rin=R/1-A? if not explain
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Answers:

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Oracle
Karma Points: 9,385
Date Posted: 7/18/2008 9:50:51 PM  Status: Live
Asker's Rating: None Provided    Moderator's Rating: Helpful
Response:
Yes Rin = R / (1-A)
Since the input impedance of an ideal voltage amplifier is infinite.
With R = 100kΩ and A=0.95V/V
Rin = 100000 / (1-0.95) = 100000 / 0.05 = 2000kΩ

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Pupil
Karma Points: 55
Date Posted: 7/19/2008 3:02:51 PM  Status: Live
Asker's Rating: N/A-Posted by Person Asking Question   
Response:
my question was that 51p in the solution they they used a Rin=R/1+A were wrong then? thanks
 



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