today's goals - bilkent universitykilyos.ee.bilkent.edu.tr/~eee314/downloads/l20.pdf · final...
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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 astable and monostable multivibrators
● Quick review of BiCMOS
● Final topics
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
FinalDue May 28th Sunday
6 questions, 2 hours12.5% TTL/ECL12.5% Basic MOS25 % CMOS gate design25 % Flip-flop gate level and transistor level12.5 % BiCMOS 12.5% multivibrator
Time needed for questions will be proportional to their percentage weight.
Between 50% and 75% of the exam will be from the examples and questions in the book verbatim.
If the average is high, I will assign a correspondingly high letter grade to the mean.
Final will be 35% ! of your grade.
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Reading assignments
You should already have read/studied chapter 9.
Chapter 11, 15 are reading assigments.
Extra material on chapter 15 will be made available at the reserves.These too will be reading assignments.
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
Draw transistor level schematic in 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
Multivibrator
(Binary) digital circuits employing positive feedback.
Bi-stable: latches and flip-flops
Mono-stable: also called one-shot storage element + digital logic + positive feedback
Astable: also called relaxation oscillator (1) storage element + digital logic + feedback
Schmitt trigger: bistable with hysteresis
There are other types of oscillators:resonant, ring, vco
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Monopulse
V x=V dd−V dd e−t /RC
2nd gate triggers when V x=0.5Vdd
=−RC ln0.5=0.69RC
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Monopulsemono deneme.include cmos05um.cir
.subckt subinv in out vdd gndM1 vdd in out vdd pfet2 L=0.5um W=4um PD=10um PS=10umM2 out in gnd gnd nfet2 L=0.5um W=2um PD=10um PS=10um.ends
.subckt subnor in1 in2 out vdd gndM1 vdd in1 mid1 vdd pfet2 L=0.5um W=80um PD=80um PS=80umM2 mid1 in2 out vdd pfet2 L=0.5um W=80um PD=80um PS=80umM3 out in1 gnd gnd nfet2 L=0.5um W=20um PD=40um PS=40umM4 out in2 gnd gnd nfet2 L=0.5um W=20um PD=40um PS=40um.ends
V1 nvdd 0 5V2 nvin 0 PULSE(0 5 2e-11 2e-11 2e-11 100e-9 25000e-9)
X1 nvin nmid3 nmid1 nvdd 0 subnorC1 nmid1 nmid2 2e-13R1 nvdd nmid2 3e7X2 nmid2 nmid3 nvdd 0 subinvX3 nmid3 nmid4 nvdd 0 subinvX4 nmid4 nvout nvdd 0 subinv
C2 nvout 0 1e-14
.tran 1e-8 4000e-7 UIC
.end
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Monopulse
Note the recovery time
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Astable Circuits
In b) assume capacitor is dischargedv x=V dd 1−e−t /RC
Inverter 2 switches to output low when v x=0.5V dd
Then at t1+ :: v x=1.5V dd and we have d)
v x=1.5V dd e−t−t1 /RC
0.5T=t2−t1−−RC ln 0.5 V dd
1.5V dd=0.4 RC
f =1.25RC
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Astable Circuits
`1
T=RC v xv y1V P
1V M
vo2t =vo20−1RC
vo1 t
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
Schmitt Trigger
Consider V iV TN
M NO∧M¿ are OFF M NF is ON/LIN and source of M NO is at V dd
When V i increases to V TN M¿ turns ON
So, the voltage at which M NO turns on is
V U=V I=V DSNIV TN
Note that VOL=0VOH=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
BiCMOS
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
BiCMOS NAND2
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
BiCMOS NOR2
Digital Device DefinitionsPhysical BasicsDiodesBJTsRTL-DTL-TTLECLMOS transistorsNMOS logicCMOS logic
Transfer characteristicsPower dissipationDelayFan-outLogic designLogic familiesDynamic logic
LayoutBiCMOS logic
Transfer characteristicsPower dissipationDelayFan-out
InterfacingBistable circuits
BiCMOS (rail to rail)