voltage transfer characteristic
DESCRIPTION
Voltage Transfer Characteristic. The simulated Inverter. Inverter layout. Inverter Characterization. VTC of Seven Inverters, WP = WN to WP = 7 WN. The threshold voltage for each of the seven inverters ideal threshold voltage Vth = VDD/2 = 1.65 V. Determination of the optimum VTC. - PowerPoint PPT PresentationTRANSCRIPT
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Voltage Transfer Characteristic
CONCORDIAVLSI DESIGN LAB
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The simulated Inverter
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Inverter layout
TPLH TPHL Tr Tf NML NMH Average power Area(um2)
103.4ps 80.63ps 166.3ps 96.6ps 0.82v 1.76v 1.14e-06w 47.7*32.4
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Inverter Characterization
TPLH TPHL Tr Tf NML NMH Average power
Area(um2)
103.4ps 80.63ps 166.3ps 96.6ps 0.82v 1.76v 1.14e-06w 47.7*32.4
.
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VTC of Seven Inverters, WP = WN to WP = 7 WN.
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The threshold voltage for each of the seven inverters ideal threshold voltage Vth = VDD/2 = 1.65 V
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WP/WN Ratio Inverter's Vth Percentage Error
1 1.22 26%
2 1.34 19%
3 1.43 13%
4 1.5 9%
5 1.55 6%
6 1.6 3%
7 1.64 1%
Determination of the optimum VTC
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Optimum VTC Wp=7Wn=Vdd/2 VTC with Vth, VIL, and VIH for Inverter for (WP/WN) = 7
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Input Waveform
Output Response
Inverter’s Transient response
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The pMOS
The nMOS
The Inverter
Laying out an inverter
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Static
Vth = 1.64 V
VIL = 1.4 V
VIH = 1.91 V
NMH = VOH - VIH = 1.39 V
NML = VIL - VOL = 1.4 V
Transient
TPHL = 0.09 ns
TPLH = 0.1 NS
TP = (TPHL+TPLH)/2 = 0.095 ns
Tfall = 0.1 ns
Trise = 0.2 ns
Power Pavg= 21.85 pw
Inverter Characterization
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DDOH VV (min)
0(max) OLV
(max)ILL VNM
(min)IHDDH VVNM
Noise Margins
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n n nOX n N
n n n nr R
p p ppOX p P
p p p
W W WC K
L L LK
W W WC K
L L L
1
nN
n n nr R
pp pP
p
WK
L WK
W WKL
Design Parameter-r
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Parasitic Capacitances in an inverter
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Step Input Response