introduction to unix and spice - doe.carleton.catjs/1908spice2013.pdf · introduction spice excel...

INTRODUCTION

Spice Excel

Wednesday, 13 March, 13

SPICE

Simulation Program with Integrated Circuit Emphasis


SPICE is a program which can be used to simulate analog electronic circuits


Analog filter circuits have a parameter called a ‘Transfer Function’ which maps input to output

with relation to frequency

v_in v_outcircuit


Analog filter circuits have a parameter called a ‘Transfer Function’ which maps input to output

with relation to frequency


A netlist is a text version of the circuit which describes the components and values for the

computer to interpret and solve




* Basic DC circuitV1 1 0 20R1 3 1 4kR2 3 2 10kV2 2 0 -10R3 3 0 8k.OP.END




* Series_RLC CircuitV1 1 0 SIN(0 5 1k) AC 1R1 2 1 50L1 2 3 100mHC1 3 0 1uF.AC DEC 100 1 10k.END


Spice is a software program that simulates electronic circuits and outputs the circuits’ basic characteristics such as:

–Voltage–Current–Resistance

at any location in the circuit

HSpice is a version used in Unix

PSpice is a version used in Windows

T-Spice simpler tool meant for smaller circuitsOptiSPICE is the best because it was written by your professor.

WHAT IS SPICE?

Text


• Create an Spice input file that describes the circuit

• Run Spice

• Inspect the output

WORKFLOW


R_R1 1 0 100

C_C1 1 2 0.01592u

V_V1 2 0 dc 0.0 ac 1.0 sin(0.0 1.0 1.0 0 0)

node value

- A netlist describes the circuit to the program- Node 0 is always GROUND

name

THE NETLIST


-The title must be the first line in the netlist (in order to recognize the options command)- R1 = 100Ω (Ohms)- C1 = 0.01592uF (micro Farads) with initial condition of 0- V1 = sine wave with 1Hz frequency, 0 to 1V magnitude- Print ac voltage at node 1- Want 100 frequency points from 0.001 to 1e+06

Title “my filter circuit”.options ingold=2R_R1 1 0 100C_C1 1 2 0.01592u IC=0V_V1 2 0 dc 0.0 ac 1.0 sin(0.0 1.0 1.0 0 0).print ac V(1).ac LIN 100 0.001 1e+06.op.END

THE INPUT FILE


•All Programs ->Tanner EDA -> T-Spice...RUN T-SPICE


VIEWING OUTPUT


TRANSFER FUNCTION• Magnitude Plot - DB vs Hz (log

scale)

• Phase Plot - Degrees vs Hz

Together these plots show the transfer function of the circuit at different frequencies


• 3-terminals: Collector, Base, and Emitter

• Common Emitter Amplifier

• input = base with respect to the emitter

• output = collector with respect to the emitter

• Most commonly used configuration for transistor-based amplifiers as it produces the highest voltage, current, and power gain.

Input Voltage

Output Voltage

BIPOLAR JUNCTION


BJT


0

1.3

2.5

3.8

5.0

0E+00 1E-08 2E-08 3E-08 4E-08

Voltage at Collector and Base of a BJT using HSpice

Volta

ge [V

]

Time [s]

BaseCollector

OUTPUT FROM HSPICE


SOME USEFUL NETLIST STATEMENTS• Analysis Types:

• Operating Point (.OC) - Voltage at each node and current from voltage sources

• AC Analysis (.AC) - Small signal model output at different frequencies

• Transient (.TRAN) - Circuit output as time passes

• Scale factors:

T : E+12G : E+9

MEG : E+6

K : E+3M : E-3U: E-3

N: E-9P: E-12F: E-15


• Components:

SOME USEFUL NETLIST STATEMENTS

Netlist Name Component Type ExampleRname Resistor Rname N+ N- Value

Cname Capacitor Cname N+ N- Value <IC=Initial Condition>

Lname Inductor Lname N+ N- Value <IC=Initial Condition>

Vname Voltage Source Voltage source: Vname N+ N- <DC=> DCValue

Iname Current Source Current source: Iname N+ N- <DC=> DCValue

Qname Bipolar Transistor Qname C B E BJT_modelName

Mname MOSFET Mname ND NG NS <NB> ModName <L=VAL> <W=VAL>

Sweep Distributions:- DEC : Log distributions of points- LIN: Linear distribution of points


TIPS IN EXCEL


• In the menu, choose Format CellsTime [s] Vout [V]0.E+00 0.0001.E-10 -0.0082.E-10 -0.0073.E-10 0.0344.E-10 0.1405.E-10 0.3226.E-10 0.5887.E-10 0.9348.E-10 1.3559.E-10 1.8391.E-09 2.373

Scientific Notation: 0 decimals

Number: 3 decimals

FORMAT CELLS


Excel can split text from one column into multiple columns using the command “Text to Columns”


• $ is used with cell coordinates, signifies leaving that coordinate constant

• Example: rearrange v=d/t to give d=v*t

The code

$


• Other: transpose, add…

• Example: Make a row of data negative

• Copy cell with -1 value, highlight cells that you want to become negative of the current values, Edit Paste Special Multiply

Positive“not yet

Negative” 0.400 0.400 -1-0.008 -0.008 -0.007 -0.007

Positive Negative0.400 -0.400-0.008 0.008-0.007 0.007

PASTE SPECIAL


• Right-click on a data point, choose Add Trendline using type: Linear, options: display equation on chart and R squared value.

0

2.8

5.5

8.3

11.0

0 2.50 5.00 7.50 10.00

y = 1.0022x + 0.3231R² = 1

w_p

[um

]

w_n [um]

BEST FIT LINE


• must have the Analysis Toolpak (go to Tools Add-ins, and install).

• tools - data analysis - regression - x and y ranges - click residuals

SUMMARY OUTPUT

Regression StatisticsRegression Statistics

Multiple R 0.999997109R Square 0.999994218

Adjusted R Square 0.999991328Standard Error 1182.326494

Observations 4

End

STATISTICS


NOW TO APPLY YOUR KNOWLEDGE!


introduction to unix and spice - doe.carleton.catjs/1908spice2013.pdf · introduction spice excel...

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