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AAS 2 > Analog Circuits > Flashcards

Analog Circuits Flashcards

1
Q

What formula is used to find the Cutoff-Frequency of a filter?

A

1/(2piRC)

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2
Q

Which of the following terms best describes the measurement of a waveform from any point in one cycle to the same point in the next cycle?

A

Period

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3
Q

Harmonics are useful in electronics for?

A

Frequency Multiplication

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4
Q

There are how many basic types (not categories) of oscillators?

A

3

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5
Q

What is the function of a step counter?

A

Provides an output increase in one step increments for each cycle of input

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6
Q

Which best describes a type of high pass filter?

A

Two parallel inductors with a capacitor in between

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7
Q

True or False? Inductive reactance provides low impedance to AC signals (high frequencies) and high impedance to DC signals (low frequencies)?

A

False

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8
Q

Which analog device is designed to pass or block a specific frequency or frequency bandwidth?

A

Filters

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9
Q

Which variation can affect amplitude stability of an oscillator?

A

Bias variations

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10
Q

Damping can be overcome by providing negative feedback ? (true or false)

A

False

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11
Q

These type of amplifiers have high input impedance and low output impedance and are used to reduce loading effects?

A

Buffer

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12
Q

Is it possible to create an oscillator with only an LC tank circuit?

A

No

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13
Q

When a mechanical stress is applied to certain crystals, electricity or electrical polarity is produced. This is known as what?

A

Piezoelectric Effect

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14
Q

What causes a crystal oscillator to mechanically vibrate?

A

Voltage

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15
Q

Frequency multipliers operate on the pulses of what?

A

Collector Current

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16
Q

The best way to measure the frequency of an oscillating signal is ?

A

Measure T and compute 1/T

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17
Q

Which waveform consists of the fundamental frequency and all of the odd harmonics in phase?

A

Square wave

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18
Q

In a tuning circuit, what allows the resonant frequency (tuned frequency) to pass to the receiving circuitry?

A

Tuning Capacitor

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19
Q

Diminished oscillations with time is a result of ?

A

Damping

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20
Q

Positive feedback is also known as?

A

Regenerative Feedback

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21
Q

Which of the following consists of undesired oscillations, due to imperfect circuits?

A

Ringing

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22
Q

What is the output of a sinusoidal oscillator?

A

AC waveform with constant amplitude and frequency

23
Q

What is the function of a limiter?

A

Limits some part of a waveform from exceeding a specified value

24
Q

Commonly, a low-pass filter has a capacitor in parallel with the output and an inductor in series with the output. What is another method of creating a low pass filter?

A

An inductor in series and a resistor in parallel with the output

25
Q

When a sinewave at a higher harmonic is added to the sinewave’s fundamental frequency, the new waveform is referred to as what?

A

Resultant waveform

26
Q

To maintain oscillations and overcome damping, an oscillator circuit requires what?

A

Regenerative feedback

27
Q

Which analog device/circuit can be used to change pulsating DC to Pure DC?

A

Filters

28
Q

Which type of oscillator uses a capacitor and resistor in its design?

A

RC Oscillators

29
Q

What term identifies the length of a pulse signal?

A

Pulse Width

30
Q

Which of the following terms best describes the condition where the time it takes a pulse to rise from 10% to 90% of its maximum amplitude?

A

Rise time

31
Q

Capacitive reactance allows high frequency signals to experience low impedance? (True or False)

A

True

32
Q

Which type of oscillator uses a tapped or split coil?

A

Hartley

33
Q

Which of the following can affect amplitude and frequency stability of an oscillator?

A

Load Variations

34
Q

Which type of oscillator uses a tickler coil?

A

Armstrong

35
Q

Which best describes a low pass filter?

A

An inductor in series with a capacitor in parallel

36
Q

The two categories in which an oscillator can be classified according to their output wave are sinusoidal and non-sinusoidal. (True or False)

A

True

37
Q

Which type of oscillator uses Rochelle salts?

A

Crystal-controlled oscillators

38
Q

What is produced when pressure is applied to a crystal?

A

Voltage

39
Q

How do you calculate the Duty Cycle of a square wave?

A

Pulse width/period

40
Q

When an alternating electrical current is applied to certain crystals, they begin to mechanically vibrate. This is called what?

A

Inverse piezoelectric effect

41
Q

Which waveform consists of the fundamental frequency and all of the harmonics?

A

Sawtooth wave

42
Q

What is the function of a clamper?

A

Restrains either the upper or lower extremity of a waveform to a fixed DC potential

43
Q

In a tank circuit the reactance is tuned to the resistance? (True or False)

A

False

44
Q

Which oscillator has good frequency stability, easy to tune and can be used for a wide range of frequencies?

A

Colpitts

45
Q

When a sinewave’s fundamental frequency is combined with the 3rd, 7th, & 11th harmonics 180 degrees out of phase, and the 5th, 9th, & 13th harmonics in phase, what type of waveform is created?

A

Peaked wave

46
Q

Which type of oscillator uses a tank circuit?

A

LC Oscillators

47
Q

Which analog device provides a given waveform at a constant peak amplitude and specific frequency to maintain the waveform within its limits?

A

Oscillators

48
Q

A demodulator is also known as a(an) ________?

A

Detector circuit

49
Q

Which analog circuit is designed to separate the intelligence from the carrier wave?

A

Demodulators

50
Q

A limiter is a _________?

A

Half-wave rectifier

51
Q

What analog device converts a DC input into an alternating waveform at the output?

A

Oscillator

52
Q

Which analog device reduces the interaction between the load and the oscillator?

A

Buffer amplifiers

53
Q

The maintenance of oscillations between pulses of excitation energy is known as ?

A

Flywheel effect

54
Q

Which of the following terms best describes the condition where the time it takes a pulse to transition from 90% to 10% of its maximum amplitude?

A

Fall time

AAS 2 (6 decks)

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