The Transistor is an electronic device semiconductor that acts as amplifier, oscillator , switch or rectifier . The term "transistor" is a contraction in English Shuttle resistor (resistance Transfer "). Today they are found in almost all everyday household goods, radios, televisions, recorders, audio and video players, microwave ovens, washing machines, cars, refrigeration, alarm clocks, quartz, computers, calculators, printers, fluorescent lamps, X-ray equipment, scanners, ultrasound scanners, mp3 players, cell phones, etc..
Substitute thermionic valve of three electrodes or triode, the bipolar transistor was invented at Bell Laboratories of EE. UU. in December 1947 by John Bardeen , Walter Houser Brattain and William Bradford Shockley , who were awarded the Nobel Prize of Physics in 1956.
The transistor consists of a substrate (usually silicon) and three parts artificially doped two junctions are bipolar, the transmitter that emits carriers, the collector who receives or collects and the third, which is sandwiched between the first two, modulates the passage of these carriers (base). Unlike the valves, the transistor is a current controlled device and obtained amplified current. In the design of transistor circuits are considered an active element, unlike resistors, capacitors and inductors are passive elements . Its operation can only be explained by quantum mechanics .
In simple terms, the current flowing through the "collector" is amplified function that is injected into the "sender", but the transistor graduates only the current flowing through itself, except from a DC source feeds the "base" to circulate the load by the "collector", according to the type of circuit is used. The amplification factor achieved between base current and collector current, the transistor is called Beta. Other parameters to consider that are specific to each type of transistor are: Breakdown Voltage Collector Emitter, Base Emitter, Collector Base, Maximum power, heat dissipation, operating frequency, and several tables where the different parameters are plotted such as base current, collector emitter voltage, base-emitter voltage, emitter current, etc. The three basic types of schemes use analog transistors are common emitter, common collector and common base. Later models
described transistor, bipolar transistor (FET transistors, MOSFET, JFET, CMOS, VMOS, etc.) Do not use the current to be injected into the terminal of "base" for modular the emitter current or collector, but the voltage at the terminal door or gate control and graduates channel conductance between source and drain terminals. Thus, the output current in the load connected to the drain (D) will be amplified function. This tension between the Gate (Gate) and source (Source). Its operation is analogous to the triode , except that the equivalent triode gate, drain and source are grating, plate and cathode.
The field effect transistors, are those that have allowed large-scale integration we enjoy today, to have a rough idea can be made thousands of interconnected transistors per square centimeter in several layers
Substitute thermionic valve of three electrodes or triode, the bipolar transistor was invented at Bell Laboratories of EE. UU. in December 1947 by John Bardeen , Walter Houser Brattain and William Bradford Shockley , who were awarded the Nobel Prize of Physics in 1956.
The transistor consists of a substrate (usually silicon) and three parts artificially doped two junctions are bipolar, the transmitter that emits carriers, the collector who receives or collects and the third, which is sandwiched between the first two, modulates the passage of these carriers (base). Unlike the valves, the transistor is a current controlled device and obtained amplified current. In the design of transistor circuits are considered an active element, unlike resistors, capacitors and inductors are passive elements . Its operation can only be explained by quantum mechanics .
In simple terms, the current flowing through the "collector" is amplified function that is injected into the "sender", but the transistor graduates only the current flowing through itself, except from a DC source feeds the "base" to circulate the load by the "collector", according to the type of circuit is used. The amplification factor achieved between base current and collector current, the transistor is called Beta. Other parameters to consider that are specific to each type of transistor are: Breakdown Voltage Collector Emitter, Base Emitter, Collector Base, Maximum power, heat dissipation, operating frequency, and several tables where the different parameters are plotted such as base current, collector emitter voltage, base-emitter voltage, emitter current, etc. The three basic types of schemes use analog transistors are common emitter, common collector and common base. Later models
described transistor, bipolar transistor (FET transistors, MOSFET, JFET, CMOS, VMOS, etc.) Do not use the current to be injected into the terminal of "base" for modular the emitter current or collector, but the voltage at the terminal door or gate control and graduates channel conductance between source and drain terminals. Thus, the output current in the load connected to the drain (D) will be amplified function. This tension between the Gate (Gate) and source (Source). Its operation is analogous to the triode , except that the equivalent triode gate, drain and source are grating, plate and cathode.
The field effect transistors, are those that have allowed large-scale integration we enjoy today, to have a rough idea can be made thousands of interconnected transistors per square centimeter in several layers
1.1 CASCADE SYSTEM WITH TRANSISTORS
HIGH IMPEDANCE CIRCUIT comprises a pair of circuit composed of a first transistor and a second transistor CIRCUIT AND BUFFER. INCLUDES A PAIR OF TYPE NPN TRANSISTORS FORMED FROM A cascading NPN type transistor and a pair of PNP type transistor is comprised of a cascade connection of PNP type transistors, AND BASES TYPE NPN TRANSISTOR TRANSISTOR AND BASES TYPE PNP which correspond to TRANSISTORS NPN TYPES ARE CONNECTED TO ONE ANOTHER. RESPECTIVELY OF HOW TO SET UP CURRENT MIRROR CIRCUIT. OUTPUT TORQUE DIFFERENTIAL CIRCUIT IS CONNECTED TO A POINT PAR Cascading TYPE NPN TRANSISTOR AND A TRANSMITTER OF AN NPN TRANSISTOR TYPE WITHIN THE PAIR OF TYPE NPN TRANSISTORS CONNECTED THROUGH AN EARTH E CONSTANT CURRENT SOURCE, AND THE ISSUER IS TO BE THE BASIS OF FIRST Transi 
STORY THROUGH THE SECOND TRAFFIC rheostat, RESPECTIVELY. Accordingly, the output PAR CIRCUIT OF DIFFERENTIAL INPUT is fed PAR DIFFERENCE CIRCUIT FOR EXAMPLE THE BASIS OF FIRST AND SECOND TRANSISTOR TRANSISTOR BASE CURRENT AS.
STORY THROUGH THE SECOND TRAFFIC rheostat, RESPECTIVELY. Accordingly, the output PAR CIRCUIT OF DIFFERENTIAL INPUT is fed PAR DIFFERENCE CIRCUIT FOR EXAMPLE THE BASIS OF FIRST AND SECOND TRANSISTOR TRANSISTOR BASE CURRENT AS. 
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