DISEÑO CON TRANSISTORES

SEP

SNEST

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INSTITUTO TECNOLÓGICO DE TOLUCA

REPORTE DE PRÁCTICA 1

PRESENTAN:
FRANCISCO JAVIER GUZMAN ARCOS NC: 11280294
DIEGO ROSSIER RUIZ NC: 10280868
DAVID EDUARDO MARTÍNEZ AMARILLAS NC: 10280892

PROFESOR: ING. JAVIER DE JESÚS GUADARRAMA GRANADOS

INGENIERIA ELECTRÓNICA

SEMESTRE: AGOSTO 2013-DICIEMBRE 2013.

METEPEC, MÉXICO. 20 DE SEPTIEMBRE DE 2013

SUMMARYIn this practice we are going to design different circuits to condition the signals that are
requested with help of fundaments and different diodes configurations, learned in class. It’s
evident that to condition the signals its necessary the implementation of trimmers and
holders circuits wearing a basic electronic circuits analysis considering the voltage, current
and frequency conditions toobtain the desired signals.
It uses different tools that will be useful to generate the input signal and measure the output
signal on the different designed circuits.
Importantly, the results that will have a slight margin of error due to various factors like:
the diode’s potential barrier, variation in the values of the resistance, capacitance, voltage
and current.

INTRODUCTION
Inelectronics, in theory as well as practice, always we will find a very important device in
the majority of applications: the diode.
An essential device due to the characteristics of metallurgic P-N junction, that allow us to
work with different signals and modify them in different forms. This is because a very
important aspect of P-N junction: the diode is a two-terminal device (anode and cathodeas
can be seen at figure 1.0) which act differently depending as polarized. When we make pass
a current from anode to cathode following the direction of the diode symbol, the resistance
of the diode will decrease to the point that we can consider as a short circuit (as can be seen
at figure 1.1); in the other case, if the current changes of direction, the internal resistance
will increase tothe point that we can consider as an open circuit (figure 1.2).
These two aspects will be of assistance along the following report, as it will be our starting
point to design the circuits that allow us to make the requested waveforms. In this case
we´ll use the rectifier diode, that it is a common diode and easy to work, also, the response
is appropriate for the circuits that we going todesign (in this report we will focus at the
diodes series 1N400X). Note that exist different models of diodes which present different
characteristics in terms of current and voltage, that fit our needs.
For the experience, we know that the diode will not work by itself, therefore we will need
support of different passive elements as resistances, capacitors, or in some cases, DC
sources, dependingof application where we will use the circuits, more specifically, couple
our circuit to obtain the requested out waveforms.
Moreover, as we mentioned, we will support on a basic analysis circuits, this is because the
diodes will response on the correct way long as we´ll make it work in an acceptable range
on terms of voltage and current, with supporting of mathematics expressions thatdetermine
the resistance, capacitance or voltage values always depending of waveform.

TRABAJO PREVIO
A)
En este inciso se requiere recortar el pico positivo y el negativo de la señal senoidal de
entrada. El pico positivo debe recortarse cuando el voltaje de entrada tenga un valor de 2
volts. El pico negativo debe recortarse cuando el voltaje de entrada tenga un valor de -1.5
volts.
La señal deentrada tiene un

con un periodo de

, por lo tanto la frecuencia es

de 1kHz.
Para el recorte del pico positivo de la señal se utiliza un recortador de una positiva
poniendo una batería en serie con el diodo. En la imagen A.1 observamos el circuito
implementado y su salida.

Imagen A.1.

Teniendo el pico positivo recortado considerando esta salida como la nueva fuente y se
propone...