EEE 421 VLSI Circuits
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1 EEE 421
2 CMOS Properties Full rail-to-rail swing high noise margins» Logic levels not dependent upon the relative device sizes transistors can be minimum size ratioless Always a path to V dd or GND in steady state low output impedance (output resistance in k range) large fan-out (albeit with degraded performance) Extremely high input resistance (gate of MOS transistor is near perfect insulator) nearly zero steady-state input current No direct path steady-state between power and ground no static power dissipation Propagation delay function of load capacitance and resistance of transistors
3 Transforming PMOS I-V Lines Want common coordinate set V in, V out, and I Dn I DSp = -I DSn V GSn = V in ; V GSp = V in - V DSn = V out ; V DSp = V out - I Dn Vout V in = V in = 1.5 V in = V in = 1.5 V GSp = -1 V GSp = -2.5 Mirror around x-axis V in = + V GSp I Dn = -I Dp Horiz. shift over V out = + V DSp
4 CMOS Inverter Load Lines PMOS 2.5 X 1-4 NMOS V in = V V in = 2.5V 2 V in =.5V 1.5 V in = 2.V V in = 1.V V in = 2V.5 V in = 1.5V V in = 2.V V in = 2.5V 1 V in = 1.5V V out (V) V in = 1V V in = 1.5V V in =.5V V in = 1.V V in =.5V V in = V.25um, W/L n = 1.5, W/L p = 4.5, = 2.5V, V Tn =.4V, V Tp = -.4V
5 CMOS Inverter VTC V out (V) NMOS off PMOS res NMOS sat PMOS res NMOS sat PMOS sat NMOS res PMOS sat NMOS res PMOS off V in (V)
6 Operating Regions Revisit transistor operating regions Region nmos pmos A Cutoff Linear B Saturation Linear C Saturation Saturation D Linear Saturation E Linear Cutoff V out A B C D E V tn /2 +V tp V in
7 Beta Ratio If b p / b n 1, switching point will move from /2 Called skewed gate Other gates: collapse into equivalent V inverter DD V out p.1 n p 1 n V in
8 Noise Margins How much noise can a gate input see before it does not recognize the input? Logical High Output Range Output Characteristics V OH NM H Input Characteristics Logical High Input Range V IH V IL Indeterminate Region Logical Low Output Range V OL NM L GND Logical Low Input Range
9 Logic Levels To maximize noise margins, select logic levels at» unity gain point of DC transfer characteristic V out Unity Gain Points Slope = -1 V OH b p /b n > 1 V in V out V OL V tn V IL V IH - V tp V in
10 Transient Response DC analysis tells us V out if V in is constant Transient analysis tells us V out (t) if V in (t) changes» Requires solving differential equations Input is usually considered to be a step or ramp» From to or vice versa
11 Inverter Step Response Ex: find step response of inverter driving load cap V ( t) u( t t ) V I V in out dv ( t t ) out dt ( t) V I DD dsn C DD ( t) load 2 dsn( t) 2 VDD V Vout VDD Vt Vout ( t) VDD V t V ( t) V V 2 D V out out D t t t V in (t) t I dsn (t) V in (t) V out (t) V out (t) C load t
12 Delay Definitions t pdr : rising propagation delay» Max time from input to rising output crossing /2 t pdf : falling propagation delay» Max time from input to falling output crossing /2 t pd : average propagation delay» t pd = (t pdr + t pdf )/2 t r : rise time» From output crossing.2 to.8 t f : fall time» From output crossing.8 to.2
13 Delay Definitions t cdr : rising contamination delay» Minimum time from input to rising output crossing /2 t cdf : falling contamination delay» Minimum time from input to falling output crossing /2 t cd : average contamination delay» t pd = (t cdr + t cdf )/2
14 Simulated Inverter Delay Solving differential equations by hand too hard SPICE simulator solves equations numerically» Uses more accurate I-V models too! But simulations take time to write (V) V in t pdf = 66ps t pdr = 83ps.5 V out.. 2p 4p 6p 8p 1n t(s)
15 Switching Waveforms Example: = 1. V, C L = 15 ff, f = 1 GHz
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