Modeling MOS Transistors. Prof. MacDonald
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1 Modeling MOS Transistors Prof. MacDonald 1
2 Modeling MOSFETs for simulation l Software is used simulate circuits for validation l Original program SPICE UC Berkeley Simulation Program with Integrated Circuit Emphasis l Other programs: IBM s internal ASX developers work closely with Berkeley Synopsys HSPICE (most commonly used?) Cadence Spectre Cadence PSPICE used for PCB simulation (not really ICs) Agilent s ADS and Ansofts Nexxim (for RF simulation) NGSPICE at sourceforge.com for free SPICE OPUS 2
3 MOSFET models 3 l Simulation models are used in circuit simulators to simulate transistor behavior created by device engineers and used by circuit designers to validate larger designs l Transistor models take as input l voltages at four terminals (drain, source, gate, body) l environmental conditions (temperature, noise) generate as output currents and capacitances l Several levels of models: Level 1 is based on GCA analysis in previous chapter BSIM is latest and accounts for deep sub-micron effects
4 MOSFET models Level 1 l Based on Gradual Channel Approximation l Good for long channel devices l low accuracy and slow l Ignores deep sub-micron effects l Ignores sub-threshold current (Ioff) 4 l Includes device parameters physical and electrical: VTO no body bias threshold voltage KP transconductance LAMBDA channel modulation coefficient PHI surface inversion potential GAMMA body effect coefficient and much more (30 or so more)
5 MOSFET models level 1 device model l Based on Gradual Channel Approximation l Not accurate or fast drain Cgd Cdb gate + Vgs - + Vds - Csb bulk Cgs 5 Cgb source
6 Correlating Model to cross section b s Gate g d P+ Source Drain N+ N+ P Silicon Substrate 6
7 gate to body oxide capacitances drain Cgd Cdb gate + Vgs - + Vds - Csb bulk Cgs 7 Cgb source
8 Capacitance between gate and substrate Gate Source Drain N+ N+ P Silicon Substrate Cgb 8
9 source / drain oxide capacitances l Based on Gradual Channel Approximation l Not accurate or fast drain Cgd Cdb gate + Vgs - + Vds - Csb bulk Cgs 9 Cgb source
10 Capacitance Source Drain Overlap Gate Source Drain N+ N+ P Silicon Substrate capacitance is always present between gate and both source and drain although this cap tends to be small. 10 C gs = W Ld t ox ε ox
11 Capacitance Linear Mode Gate Source Drain N+ N+ P Silicon Substrate 11 capacitance is split between Cgs and Cgd in linear mode. Substrate is shielded by inversion layer. Also includes small overlap capacitance. 1 W L εox C gs = Cds = + ox 2 t C ov
12 Capacitance Saturation Mode Source Drain N+ N+ P Silicon Substrate 12 capacitance is to incomplete inversion layer which provides a connection to the source only. Gate to drain cap is limited to overlap only. 2 W L εox C gs = + 3 tox C ov
13 MOSFET models - junction capacitance drain Cgd Cdb gate + Vgs - + Vds - Csb bulk Cgs 13 Cgb source
14 Capacitance Saturation Mode Source Drain N+ N+ P Silicon Substrate Junction capacitance increases with increases in doping and decreases with increases in reverse bias voltage. SOI virtually eliminates this capacitance. 14
15 MOSFET models series resistance drain Cgd Cdb gate + Vgs - + Vds - Csb bulk Cgs 15 Cgb source
16 Capacitance source/drain resistance Source Drain N+ N+ P Silicon Substrate As source / drain junction depth (Xj) decreases with each new technology generation, source drain series resistance is growing. 16
17 Simple SPICE program *Spice Input File (deck)for an inverter VIN in gnd PULSE( ns 2ns 2ns 50ns 100ns) * d g s b model mp out in vdd vdd PMOS L=0.18u W=0.8u mn out in gnd gnd NMOS L=0.18u W=0.4u 17.tran 0.1ns 20ns 0n 100p.print TRAN V(out) V(in).model P1 PMOS Level=1 +VT0=0.35 KP=2.0e-5 GAMMA=0.37 PHI=0.65 LAMBDA=0.02 +RD=1.0.model N1 RS=1.0 NMOS Level=1 +VT)=0.35 KP=4.0e-5 GAMMA=0.37 PHI=0.65 LAMBDA=0.02 +RD=1.0.end RS=1.0
18 Simple SPICE program *Spice Input File (deck)for a NAND gate VIN in gnd PULSE( ns 2ns 2ns 50ns 100ns) * d g s b model mpa out a vdd vdd PMOS L=0.18u W=0.8u mpa out b vdd vdd PMOS L=0.18u W=0.8u mna out a int gnd NMOS L=0.18u W=0.8u mna int b gnd gnd NMOS L=0.18u W=0.8u.tran 0.1ns 20ns 0n 100p.print TRAN V(out) V(a) V(b).include NMOS_MODEL.include PMOS_MODEL.end 18
19 MOSFET models BSIM3 l Models generated by UC Berkeley l Depends on empirical fitting l includes Short Channel Effects (SCE) Vt rolloff Vts are influenced by Leffs at short channel length mobilities sub-threshold leakage l Capacitance models the same but more accurate l Source / Drain resistance l Designed with computational speed in mind l Used universally now 19
20 UFSOI models l Models generated by University of Florida l Incorporated into Berkeley Spice 3E5 l Models describe physical features of transistor l Best models for SOI but can model bulk too. l Used in this class l Compiled for Sun machine, but we have source which could be ported to Linux or PC (extra credit?) 20
21 Specifying Source/Drain areas/perimeters n-well 7u 5u 7u mp PMOS L=0.18u W=5u AS=35p PS=24u AD=35p PD=24u By specifying area and perimeters of the source and drain, the caps can be calculated for the area and sidewalls. 21
22 22 Spice in interactive mode
23 23 Spice in batch mode
24 24 Spice Example
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