Voltage Transfer Characteristic
description
Transcript of Voltage Transfer Characteristic
Voltage Transfer Characteristic
CONCORDIAVLSI DESIGN LAB
The simulated Inverter
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
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.
The threshold voltage for each of the seven inverters ideal threshold voltage Vth = VDD/2 = 1.65 V
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
Optimum VTC Wp=7Wn=Vdd/2 VTC with Vth, VIL, and VIH for Inverter for (WP/WN) = 7
Input Waveform
Output Response
Inverter’s Transient response
The pMOS
The nMOS
The Inverter
Laying out an inverter
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
DDOH VV (min)
0(max) OLV
(max)ILL VNM
(min)IHDDH VVNM
Noise Margins
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
Parasitic Capacitances in an inverter
Step Input Response