INTRODUCTION Spice simulators. It can import external libraries

INTRODUCTION

What is LTSpice?

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LTspice
is freeware computer software that implements a SPICE simulator of electronic
circuits produced by the manufacturer of a semiconductor called Linear
Technology or LTC.

The
SPICE means Simulation Program with Integrated Circuits Emphasis that was
created in year 1972. As time passed by they made the user interface of the
LTSpice more user friendly and easy to use. In year 2009, LTSpice IV which can
run in multiprocessor was launched. It features a general purpose schematic
capture that includes unlimited schematic size, unlimited depth of hierarchy
and simple editor.

LTSpice
IV is used within the Linear Technology that differs from other Spice
simulators. It can import external libraries to add a specific part using
generic Spice files easily if you need to make a specific simulation with parts
that have specified in advance.
            Simulators
such as the spice simulator are very useful tools nowadays especially for
circuit analysis. It function as a great schematic editor even for a beginner
user, you just need to make a general schematic diagram for your project or
whatever you are in need on using it to. Students being able to learn how to
use a SPICE simulator is truly useful for especially in classes with electronic
circuit analysis.

OVERVIEW

LTspice
IV is an outstanding software application for its power, calculation speed and
the universality of its applications. This is THE software that must be used to
produce high performance electronics in this century where demand for quality
must go hand in hand with fast development. The LTspice IV is node-unlimited
and third-party models can be imported. Circuit simulations based on transient,
AC, noise and DC analysis can be plotted as well as Fourier analysis. Heat
dissipation of components can be calculated and efficiency reports can also be
generated.

            LTspice
IV is used within LTC, and by many users in fields including radio frequency electronics, power electronics, digital electronics,
and other disciplines. LTspice IV does not generate printed circuit board (PCB)
layouts, but netlists can be imported into layout programs. While LTspice does
support simple logic gate simulation, it is not designed specifically for
simulating logic circuits.

            LTspice
was originally called SwitcherCAD and is sometimes still called by that name.
The software is maintained by Mike Engelhardt. The application is written
for Microsoft Windows but,
since 2003, it will run under the Wine Windows
compatibility layer under Linux.
Since 2013 there is also a native OS X version
available. From version IV LTspice requires at least a Pentium 4 processor
and Windows 2000 or later.

            Upon creating a new schematic diagram
for the project, we can make use of different shortcuts which makes the simulation
easier. The following are the list of useful shortcuts in LTSpice:

 

 

Shortcut Keys

Shortcut Keys
Equivalent Meanings

C

Place capacitor

CTRL+R

Rotate (when component is
selected)

CTRL+E

Mirror (when component is
selected)

D

Place diode

F2

Component menu

F3

Draw wire

F4

Label net

F5

Delete (press F5 then
click the component)

F6

Copy

F7

Move without wires

F8

Drag/move with wires

F9

Undo (shift + F9 to redo)

G

Place ground

L

Place inductor

R

Place resistor

 

                        After
making the schematic diagram using the LTSpice application, the researchers can
now check if the values needed in the diagram are correct. With this, it will
display a graph which helps to identify if the values are exact or not exact.
LTSpice is also capable of several types of simulation, such as the .tran and
.ac, which means transient and ac sweep analysis. Even
high performance simulator, LTSpice also has its flaws in capability. If
the components that are needed in the project is not available on the software,
missing components are available to download through the internet, after
downloading the component/s the user must input it directly in the LTspice
application in order to use it.

 

 

 

 

 

 

 

DATA AND RESULTS

DC Sweep (Linear Regulator)

Figure 1. Two Resistor in Series

 

 

 

 

Figure 2. DC Sweep (Linear Regulator)

 

 

 

 

Figure 3. AC analysis (Second-order Bandpass
Filter)

 

 

 

 

Figure 4. Transient analysis (Inverting Amplifier)

 

 

 

 

Figure 5. Transient Analysis (PWM Filtering)

 

 

 

 

Figure 6.  Step Parameter (Full-wave Bridge Rectifier)

 

 

 

 

 

IV. PROBLEMS ENCOUNTERED

1.      
In figure 3, the
students thought that the Sine (0 100m 100) is a comment or directive. Due to
lack of familiarity of the application, it is thought that it was a part of
advanced settings on a voltage.

2.      
The researchers have
not been able to properly set the value of the Y-axis because of the minimized
space that is set.

3.      
The researchers had a
hard time finding some components.

4.      
The LTspice force
closes unabling the researchers to retrieve the output data.

 

 

RECOMMENDATIONS

 

To further increase
the knowledge of the future researchers, the present experimenters of the paper
suggest the following:

 

·        
The researchers
should familiarize themselves in the application, LTspice.

·        
The topic or review
about LTspice must be discussed first before the lab activity in LTspice is
done.

·        
The researcher must
make use of the shortcuts in LTSpice to ease their way of doing the project/
activity.

·        
The researchers also
have to make sure that the scalings and graphs are visible in order to see the
graph and interpret datas.

·        
Always remember to
save works.