Semiconductors, ICs and Digital Fundamentals
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1 Semiconductors, ICs and Digital Fundamentals
2 The Diode The semiconductor phenomena. Diode performance with ac and dc currents. Diode types: General purpose LED Zener
3 The Diode The semiconductor phenomena Atoms in a metal allow a sea of electrons that are relatively free to move about. Semiconducting materials like silicon and germanium have fewer free electrons. Impurities added to semiconductor material can either add free electrons or create an absence of free electrons (holes).
4 Inside a Diode The voltage required to force electrons across the junction, from the Anode to the Cathode is called the forward voltage or junction threshold voltage. Silicon Diodes =.7 volts Germanium Diodes =.3 volts
5 Inside a Diode PIV Peak Inverse Voltage Maximum reverse voltage that may be applied before reverse breakdown occurs Average forward current is the point where heat will destroy the diode Schottky diode has low junction capacitance which allows operation at high frequencies. Often used in RF switching circuits.
6 The Diode with AC Current If ac is applied to a diode: During one half of the cycle, the diode is forward biased and current flows. During the other half of the cycle, the diode is reversed biased and current stops. This is the process of rectification, allowing current to flow in only one direction. This is used to convert ac into pulsating dc.
7 The Diode with AC Current Output Pulsed DC Voltage Diode off Diode conducts Input AC Voltage
8 The Light Emitting Diode (LED) In normal diodes, when electrons combine with holes current flows and heat is produced. With some materials, when electrons combine with holes, photons of light are emitted. This forms an LED. LEDs are generally used as indicators, but they have the same properties as a regular diode.
9 The Light Emitting Diode (LED) Negative Side = Cathode Negative Side = Flat Negative Side = Short Wire Positive Side = Anode Positive Side = Long Wire
10 The Light Emitting Diode Build the illustrated circuit on the proto board. The longer LED lead is the anode (positive end). Observe the diode response Reverse the LED and observe what happens. The current limiting resistor not only limits the current but also controls LED brightness. 330
11 A Zener diode is designed through appropriate doping so that it conducts at a predetermined reverse voltage. The diode begins to conduct and then maintains that predetermined voltage. The over-voltage and associated current must be dissipated by the diode as heat. Zener Diode 9 V 4.7 V
12 The Transistor There are two basic types of transistors depending of the arrangement of the material. PNP NPN An easy phrase to help remember the appropriate symbol is to look at the arrow. PNP pointing in proudly. NPN not pointing in. The only operational difference is the source polarity. PNP NPN
13 The Transistor Bi-Polar collector base emitter
14 The Transistor Switch During the next two activities you will build a transistor switch The pin-out of the 2N3904 transistor is indicated here E B C
15 The Transistor Switch Build the circuit on the proto board. Use hook up wire to serve as switches to connect the current to the transistor base. What happens when you first apply power when the base is left floating (not connected)? 9 V
16 The Transistor Switch Make the illustrated adjustment to the circuit. Connect one end of some hook-up wire to the positive side of the 9 volt battery. Touch the other end (supply 9 volts) to the resistor in the base line and observe what happens. 9 V
17 The Transistor Switch Now replace the hook-up wire connection with a connection to a 1.5 volt battery as shown. What happens when +1.5 volts is applied to the base? What happens when the battery is reversed and 1.5 volts is applied to the base?
18 The Transistor Switch When does the transistor start to turn on? Build up the illustrated circuit with the variable resistor in the base circuit to find out.
19 Power Transistors Must be insulated Case = Collector Heat transfer
20 MOSFET Metal-Oxide-Semiconductor FET Notice the insulating layer of oxide between the GATE and the TRANSISTOR.
21 Op-Amp Operational Amplifier Uses: Microphone Preamp, filters, comparators, DC/AC inverters
22 Linear Voltage Regulator 78xx Series Uses: Provide constant voltage to IC s, OP-Amps, control circuits, pass-transistors for power supplies. 1 amp typical as shown
23 Digital Integrated Circuits Page 4-26
24 Digital Integrated Circuits Flip-flops has 2 stable states
25 Digital Integrated Circuits How many states are there in a 3 bit binary counter? 3
26 Digital Integrated Circuits CMOS Complementary Metal Oxide Semiconductor The CMOS family of logic devises is the most popular today because of their high speed and low power consumption.
27 Digital Integrated Circuits Vocabulary ROM = Read Only Memory (Can t change) Volatile Memory = Goes away when power is off Non-Volatile Memory = Keeps data when power is off
28 Digital Integrated Circuits Universal Serial Bus
29 Digital Components Light Emitting Diode LED s are cheaper, last longer, turn on/off quicker, and use less power than conventional light bulbs
30 Digital Components Liquid Crystal Display LCD s are designed to block light to create characters, thus they need to have either back light or ambient light since they do not generate light of their own.
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