digital circuit 101101 - edx · digital circuit 101101. 2 review c + – + – r v v c i v c (0) =...
TRANSCRIPT
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6.002x CIRCUITS AND ELECTRONICS
Digital Circuit 101 101
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Review
C +
– + –
R vC vI
vC (0) = VO
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( ) RCt
IOIC eVVVv−
−+= 1
C +
– + –
t0
vI
VI
R
vC vI
vC (0) = VO
An Intuitive Approach
cbvdtdv
a =+
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Let’s apply the result to an inverter
Demo
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A B
VS VS
X CGS
First, rising delay tr at B
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A B
VS VS
X CGS
1 à 0 at A
Rising delay tr at B
Bv
0
0
vA
5V
5V
t
t
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Equivalent circuit for 0à1 at B
A B
VS VS
X CGS
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GSLCRt
SSB eVVv−
−=Rising delay tr at B
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Numbers
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Falling Delay at B tf
A B
VS VS
X CGS
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Falling Delay at B tf Equivalent circuit for 1 à 0 at B
+ – +
–
( )( )VVv SB5
0 =RL
VS
X
RON CGS vB
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Falling Delay at B tf
ONLTH RRR ||=
LON
ONSTH RR
RVV+
=
+
– + – CGS vB
RTH
VTH
( )( )VVv SB5
0 =
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+
– + – CGS vB
RTH
VTH
Falling Delay at B tf
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Numbers
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Slower may be better
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Slower may be better
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Demo