INTRODUCTION
Spice Excel
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
Analog filter circuits have a parameter called a ‘Transfer Function’ which maps
input to output with relation to frequency
Analog filter circuits have a parameter called a ‘Transfer Function’ which maps
input to output with relation to frequency
Analog filter circuits have a parameter called a ‘Transfer Function’ which maps
input to output with relation to frequency
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
A netlist is a text version of the circuit which describes the components and values for the
computer to interpret and solve
A netlist is a text version of the circuit which describes the components and values for the
computer to interpret and solve
A netlist is a text version of the circuit which describes the components and values for the
computer to interpret and solve
A netlist is a text version of the circuit which describes the components and values for the
computer to interpret and solve
A netlist is a text version of the circuit which describes the components and values for the
computer to interpret and solve
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
A netlist is a text version of the circuit which describes the components and values for the
computer to interpret and solve
* 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 circuits
OptiSPICE is the best because it was written by your professor.
WHAT IS SPICE?
• 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
Using PSPICE
• Create a netlist file using notepad (Make sure you have a .probe)
• Save as “.cir” file on desktop• Start up PSPICE• Open the file in PSPICE• Simulate “big green triangle”• Use trace to bring up the plot window and pick things
to show.
Using PSpice
• All Programs ->Tanner EDA -> T-Spice...
Other spices: likely won’t work
VIEWING OUTPUT
Using HSPICE
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
For HSPICE and PSPICE use Excel to generate the plots
• 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 TRANSISTOR
BJT
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+6K : E+3M : E-3U: E-3N: E-9P: E-12F: E-15
• Components:
SOME USEFUL NETLIST STATEMENTS
Netlist Name Component Type Example
Rname ResistorRname N+ N- Value
Cname CapacitorCname N+ N- Value <IC=Initial Condition>
Lname InductorLname 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 MOSFETMname 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 Cells
Time [s] Vout [V]
0.E+00 0.000
1.E-10 -0.008
2.E-10 -0.007
3.E-10 0.034
4.E-10 0.140
5.E-10 0.322
6.E-10 0.588
7.E-10 0.934
8.E-10 1.355
9.E-10 1.839
1.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 Negative
0.400 -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.
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 Statistics
Multiple R 0.999997109
R Square 0.999994218
Adjusted R Square 0.999991328
Standard Error 1182.326494
Observations 4
End
STATISTICS
NOW TO APPLY YOUR KNOWLEDGE!