Digital Device Definitions Physical Basics Diodes BJTs RTL-DTL-TTL ECL MOS transistors NMOS logic CMOS logic Transfer characteristics Power dissipation Delay Fan-out Logic design Logic families Dynamic logic Layout BiCMOS logic Transfer characteristics Power dissipation Delay Fan-out Interfacing Bistable circuits ● Cover Bistable circuits ● Chapter 5 of Eshraghian book is reading assignment for CMOS logic and CMOS flip-flops. ● Chapter 9 of Taub-Schilling book is reading assignment for CMOS and flip-flops. Today's Goals
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Today's Goalskilyos.ee.bilkent.edu.tr/~eee314/downloads/l19.pdf · MOS transistors NMOS logic CMOS logic Transfer characteristics Power dissipation Delay Fan-out Logic design Logic
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Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
● Cover Bistable circuits
● Chapter 5 of Eshraghian book is reading assignment for CMOS logic and CMOS flip-flops.
● Chapter 9 of Taub-Schilling book is reading assignment for CMOS and flip-flops.
Today's Goals
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
HW-4
1) Derive TPLH2) 9.53) 9.10
Due May 12th Friday
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Quiz
Implement in NMOS, CMOS and DOMINO LOGIC
F=AB+C(A+D)
Describe the behaviour of the following circuit.
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Dynamic CMOS
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Dynamic CMOS
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Dynamic CMOS
Cascading problem!
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Dynamic CMOS: Domino
can be cascaded
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Dynamic CMOS
There are a number of dynamic CMOS logic families of varying complexity.
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
CMOS MSI logic families
74HC(T) SeriesLG=3 microntox=60nmVdd=4.5 to 5.5 VDelay in driving 50pF is about 35 ns.Double bufferedInverter stages has the following widths
1st 2nd 3rd PMOS 9 35 90NMOS 3.5 15 35
1st stages of NAND/NOR etc scaled accordingly. Buffer stages the same.
This is good for a circuit at a few 10 Mhz.
Fan out when driving LSTTL is 10.
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
CMOS bufferingT PHL=...
C L
K N [ V TN
12V DD−V TN
2
2
V DD−V TN
ln 2 V DD−V T
V DD]
T PHL=T PLH=t p=2CL
K V DD
Further simplify to T PHL=T PLH=t p=R C L
where
R= 2K V DD
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
CMOS buffering
Assuming for K p=K n we must have W p=2 W n
C input=C1=3W L tox
Rn=R p=R1=2K V DD
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
CMOS buffering
T d1=R1 C L
T d2=R1 N C1R1
NC L
T d3=R1 N C1R1
NN 2 C1
R1
N 2C L
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
CMOS buffering
T d1=R1 C L
T d2=R1 N C1R1
NC L
T d3=R1 N C1R1
NN 2 C1
R1
N 2C L
Assume C L=100C1 and N=5
T d1=100 R1 C1
T d2=25 R1 C1
T d3=14 R1 C1
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out