Thermal nodes Input1 2 o-- ---O Input2 3 o O Junction Temp o

Transcription

1 CMOS NAND Gate with Juctio temperature moscadt CMOS NAND Gate with Juctio temperature Vdd 1 o * * Thermal odes Iput1 o-----o Iput 3 o o Juctio Temp o *--o 4 Output / \ / \ ---+ o Thermal Ref o GND 5 Authors: Toy Mulder, Travis Letz

2 Descriptio: This elemet implemets a geeric CMOS NAND gate ad calculates juctio temperature. Form: moscadt: <istace ame> <parameter list> istace ame is the model ame 1 is the NAND elemet Vdd ode, is the NAND elemet iput 1 ode, 3 is the NAND elemet iput ode, 4 is the NAND elemet output ode, 5 is the NAND elemet Groud ode, 6 is the NAND elemet Juctio temperature ode, is the NAND elemet Thermal Referece ode. 7 Parameters: Parameter Type Default value Required? vt: NMOS threshold DOUBLE 1 o voltage V) vtp: PMOS threshold DOUBLE -1 o voltage V) u: effective mobility of DOUBLE 500 o electros i NMOS cm^)/v-sec) up: effective mobility of DOUBLE 00 o holes i PMOS cm^)/vsec) e: permittivity of gate DOUBLE e-14 o isulator i NMOS F/cm) ep: permittivity of gate DOUBLE e-14 o isulator i PMOS F/cm) tox: thickess of gate DOUBLE e-6 o isulator cm) w: chael width of DOUBLE 50e-6 o NMOS cm) l: chael legth of DOUBLE e-6 o NMOS cm) wp: chael width of DOUBLE 100e-6 o PMOS cm) lp: chael legth of DOUBLE e-6 o PMOS cm) td: respose delay time sec) DOUBLE 0 o

3 thermal: thermal elemet BOOLEAN False o flag tom: omial temperature DOUBLE 300 o K) zt: thermal impedace DOUBLE 310 o summatio K/W) c1: PMOS GS capacitace DOUBLE 1e-1 o F) c: NMOS GS capacitace DOUBLE 1e-1 o F) c3: output GS Miller) DOUBLE 1e-1 o capacitace F) c4: parasitic diode DOUBLE 1e-1 o capacitace from output to Vdd F) C5: parasitic diode DOUBLE 1e-1 o capacitace from output to Groud F) freq: operatig frequecy DOUBLE 1e6 o Hz) lk: leakage curret A) DOUBLE 8e-6 o Example: moscadt:ad "tref"

4 Model Documetatio: Start o a ew page, Iclude Eglish ad make sure fot sizes are cosistet. Use figures if ecessary. Please avoid usig scaed image.) MOSFET cutoff curret I, for V gs < V t : I = 0 MOSFET curret factor β: β = μ * * W / L) C ox MOSFET liear curret I, for V gs V t > V > 0: I = β * V V V / )) * V gs t MOSFET saturatio curret I, for V > V gs - V t > 0: I = β / ) * V V ) gs t Power dissipatio P D : P = V * I ) + V * I ) + * freq * C * V ) D sd, pmos sd, pmos, mos, mos dd + Juctio temperature T j : T = T + P * θ ) j ambiet D ja Refereces: 1. Maze M Kharbutli. freeda elemet moscad. DEFAULT_ADDRESS"elemets/Moscad.h.html" Sample Netlist: * DC thermal CMOS NAND Test * DC sweep iput voltage from 0 to 5V.dc sweep="vsource:vi" start=0 stop=5 step=0.1.optios iitmp=300.ref "tref".ref 0 vsource:vdd 1 0 vdc=5 vsource:vi 0 vsource:vdd 3 0 vdc=5 moscadt:ad "tref" thermal=1 res:r 4 0 r= ***thermal circuit res:r r=6e3 leakage

5 vsource:t "tref" vdc=iitmp cap:c c=1e-1.out plot term 4 vt i "ad_voltage.out".out plot elemet "moscadt:ad" 4 ut i "ad_temperature.out".out plot elemet "moscadt:ad" 0 it i "ad_curret.out".ed Validatio: This thermal CMOS NAND model ad thermal juctio temperature calculatio to the existig electrical CMOS NAND model moscad). Simulatios were performed usig the existig moscad model i a etlist with a DC sweep from 0 to 5 Volts at the oe iput termial. The secod iput termial was coected to a DC voltage source of 5V. The resultig output voltage ad curret was recorded. The thermal CMOS NAND model moscadt) was validated by makig a ew etlist with the moscadt model. The resultig moscadt voltage output ad curret output was compared to those of the origial moscad model ad idetical electrical results were obtaied. The resultig moscadt juctio temperature data was empirically verified by correlatig juctio temperature data poits with maually calculated results. The origial moscad model uses a default parameter of wp = 50e-6 cm chael width of PMOS). If this default parameter is used a erroeous elemet curret output results. The moscadt model uses a default parameter of wp = 100e-6 cm, resultig i a expected elemet curret output. Kow Bugs: Noe. Credits: Name Affiliatio Date Liks Travis Letz NC State Uiversity April 005 tletz@hotmail.com Toy Mulder NC State Uiversity April 005 mulder_la@yahoo.com