elex reviewer 2

7/28/2019 ELEX Reviewer 2

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CHAPTER 6

DArsnoval Best type of meter movement

Wattmeter A dynamometer type which has uniform scale;

Dynamometer Most expensive;

Mainly used as wattmeter;

Can be used for AC or DC works

Permanent Magnet Moving Coil

Instruments

Can only be applied to DC work only;

The reason why its scale is uniform is because it is spring controlled;

Springs provide the controlling force;

Most sensitive instrument

Moving Iron instruments Considered as attraction and repulsion instruments;Typical IFS is 50mA;

Typical VFS is 50mV;

Uses squared scale;

Induction watt-hr meter Most commonly used induction type of instrument

Watt-hour meter Is an integrating type of instrumenr

Rest When both deflecting and controlling torque act, the pointer of an indicating instrument comes to ______

Deflecting force (for analog ins) Causes the moving system to deflect from its zero position

Controlling force (for analog ins) Ensures that the deflection of the pointer for a given value of measured quantity always has the

same value

Damping force (for analog ins) Quickly brings the moving system to rest in its final position

Damping and Controlling

Torques

Opposes the deflecting torque

Damping torque is zero If the pointer is in the final deflected position

Thermocouple Instrument where output voltage is proportional to the temperature;

An ammeter used to measure high freq currents

Thermistor Type of resistor used to measure temp changes with change in resistance

Never When should a fuse be replaced by a higher rated unit?

Pulse width Time interval that a waveform is High or low is _____ of the signal

Pulse delay Time delay between pulses

Period The interval of a pulse from start to end

CRT Heart of CRO (cathode ray oscilloscope)

Wheatstone Bridge Measures resistance accurately;

Balanced if there is no current the f lows through the load;

R1/R2 = R3/R4

Potentiometer Bridge Measures Voltage accurately

Maxwell Bridge Measures unknown inductance with in terms of known capacitance;

Used to measure medium coils (1


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At half of full Indicating instruments are assumed to be most accurate at _____ part of the scale.

At far right 0 mark is located ______ for a simple ohmmeter

Resolution The smallest change in applied stimulus that will indicate a detectable change in deflection in an indicating

instrument

CHAPTER 7

Inductor Cannot be fabricated in IC

To produce change in output

when an input voltage equals a

reference voltage

Purpose of comparator in OP-AMP

OP-AMP Mostly uses positive feedback;

High Zin, Low Zout, BW is infinity, open loop gain is infinity;Most commonly used type of linear IC;

50mW typical power dissipated of OP-AMP;

500mW absolute max rating for OP-AMP interval power dissipation

1V/us typical slew rate of OP-AMP

30V absolute max rating for an OP-AMP differential input voltage

20dB/decade rate of gain reduction in OP-AMP

80nA typical input bias current of 741 OP-AMP

25mA short circuit current output of 741 OP-AMP

0.5V/uS slew rate of 741 OP-AMP

2 - # of power supplies required by 741 OP-AMP

OP-AMP magnitude comparator

circuit

Doesnt use feedback

OP-AMP input bias current Is the average of the 2 base currents

uA741C OP-AMP Is used for commercial purposes;

Its CMRR = 70dB

Voltage follower An OP-AMP circuit that has its output tied directly to the inverting terminal

Summing Point in an OP-AMP A terminal of the OP-AMP where the input resistors are commonly connected

Ratio of Rf/R must be equal to

the reciprocal of the number of

inputs

Condition to convert a summing amplifier to an averaging amplifier

Negative The summing amplifier has 2 or more input and its output voltage is proportional to the _______ of the algebraic

sum of its input voltages.

Power BW The highest undistorted freq output of an OP-AMP for a given slew rate and peak voltage

Less than 1W Power dissipation of most low power linear IC

2 mega ohms Typical input resistance of the OP-AMP when measured under open loop

555 timer Most popular IC in used in timing circuits;Can be used in monostable and astable applications

Square wave clock _____ is an astable multivibrator (relaxation oscillator)

RC synthesis Technique used to eliminate the need for inductive elements in monolithic IC

Single-Stone Monos / Lithos

SSI Up to 9 gates

MSI 10 to 100 gates

LSI More than 100 gates

VLSI More than 1000 gates

(not sure about these ranges kasi iba yung nasa table summary. pero eto yung sagot sa book)

BIFET IC OP-AMP that combines FETS and Bipolar transistors

Relaxation oscillator Operates on the principle of the charge and discharging of a capacitor

Digital IC Possesses digital signals

Linear IC Possesses analog signals

Thick Film and Thin Film We can use ____ and _____ if higher power ICs are needed.

Common Mode signal Signal that is applied with equal strength to both inputs of a differential amplifier or an OP-AMP

-55 to +125 deg Celsius Military and space IC

-25 to +85 deg Celsius Industrial IC

0 to +70 deg Celsius Commercial IC

Military and Industrial After assembly, the ICs are tested and classified as either ______.

(Yung letter C choice is Military or Industrialdiba dapat EITHER-OR?)

DIP packaging Low in cost;

Tiniest packaging known;

Ruggedly resists vibration

ICs advantages over discrete

devices (soldered devices)

Lower cost;

High reliability;

Smaller in size

VCO It exhibits a freq that can be varied with a DC control voltage


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Av = Rc / 2Re Voltage gain of a differential amplifier

The difference in VBE values Source of output offset voltage

manufacturer Letter-prefix code indicates the ______

Packaging type Letter-suffix code indicates the _________

D, J, N Most common packaging type

D packaging suffix for Plastic DIP for surface mounting on a PC board

P,N packaging suffix for Plastic DIP for insertion in sockets

J packaging suffix for Ceramic DIP

1.5 mils x 3 mils Typical dimension of a MOSFET in a single chip IC

3 mils x 4.5 mils Typical dimension of a DIODE in a single chip IC

4 mils x 6.5 mils Typical dimension of a BJT in a single chip IC

It has an inherent current

limiting

Advantage of a shunt regular type over a series regulator type

Flat response Type of response that characterizes a single pole low pass filter

Single RC circuit The term pole refers to a ________ in terms of circuit component.

Stray wiring capacitance Unwanted capacitance between connecting wires and ground

1M transistors Intel i486 32 bit microprocessor has _________ on a single chip

Trip point It is the value of the input voltage that switches the output comparator or Schmitt trigger

Virtual ground Type of ground that appears at the inverting input of an OP-AMP that used negative feedback

CCD (charge-coupled

Capacitor)

1969; by WS Boyle and GE Smith

0.5 to 15GHz Microwave ICs cover the freq range

The inverting input is

connected to the +5V

In a 5V level detector circuit, ______________

Ground To use a comparator for zero-level detection, the inverting input is connected to the ___

Czochralsky Pulling technique Most common method used for the growth of single crystals for IC farbrication

Compensating Capacitor Prevents oscillations inside an OP-AMP

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