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Communications 1 > Communications Circuits > Flashcards

Communications Circuits Flashcards

1
Q

A passive circuit that variably reduces the amplitude or power of a signal without considerably distorting its waveform

A

Pad/Attenuator

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2
Q

What do you call fixed attenuators?

A

Pads

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3
Q

A measure of attenuation introduced by the system in dB

A

Insertion Loss

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4
Q

It represents the ratio of signal level at one point in a circuit to the signal level at another point in a circuit

A

Decibel Notation

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5
Q

The decibel originated as Be is named after

A

Alexander Graham Bell

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6
Q

The impedance which when used to terminate one end of a two-port network will make the impedance seen on the other end equal

A

Iterative Impedance

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7
Q

Adjusting the source/load impedance

A

Impedance Matching

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8
Q

It is a frequency-selective circuit designed to pass some frequencies and reject others

A

Filters

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9
Q

The range of output that have a high output

A

passband

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10
Q

The range of frequencies that are attenuated or rejected

A

stopband

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11
Q

The frequency between a passband and a stopband

A

cut-off frequency

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12
Q

The rate of transition from passband to stopband, and vice versa, is

A

roll-off rate

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13
Q

The frequency at which the output power is 50% of the maximum or the output amplitude is 70.7% of the maximum

A

cut-off frequency

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14
Q

Also known as critical frequency, corner frequency, break frequency, and half-power point frequency

A

cut-off frequency

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15
Q

Composed of only passive components

A

Passive Filters

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16
Q

A filter that provides no amplification

A

Passive

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17
Q

Typically employs RC networks and amplifiers with feedback

A

Active

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18
Q

Termed maximally-flat-magnitude-response filters, optimized for gail flatness in the pass-band and have slow transition.

A

Butterworth

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19
Q

Optimized for maximally-flat time delay

A

Bessel

20
Q

Designed to have a ripple in the passband, but they have a steeper roll-off after the cut-off frequency

A

Chebyshev

21
Q

Has an almost perfect frequency response but has variations on both the passband and stopband

A

Elliptic

22
Q

Passes freuencies below the cut-off frequency and attenuated those above

A

Low-Pass Filter

23
Q

Passes Frequencies above critical frequency but rejects those below

A

High-Pass Filter

23
Q

Passes only frequencies in a narrow range between the upper and lower cut-off

A

Bandpass Filter

24
Q

Rejects or stops frequencies in a narrow range but passes others.

A

Bandstop Filter

25
Q

It is the ratio between the frequencies at two signals

A

Interval

26
Q

The condition in an AC circuit where Xl equals Xc

A

Resonance

27
Q

It is the basis of all transmitters, receiver, and antenna operation.

A

Resonant Circuits

28
Q

Minimum impedance and maximum current happens at

A

Series resonance

29
Q

The exchange of energy between the inductor and the capacitor

A

Flywheel effect

30
Q

What is the primary purpose of the parallel tuned circuits?

A

To form a complete AC sine wave output as it produced damped sine wave at resonant frequency.

31
Q

Maximum Impedance and minimum current

A

Parallel Resonance

32
Q

The ratio of the reactive power to the true power

A

Quality factor

33
Q

A measure of the band pass filter’s selectivity

A

Quality Factor

33
Q

Amplify only a relatively narrow portion of the spectrum, attenuating all other frequencies.

A

RF Amplifiers

34
Q

What is the fundamental difference between the AF and RF amplifier?

A

The band of frequencies they are expected to amplify.

35
Q

The first stage of an amplifying system showed a low-noise type because all following stages will be amplifying any noise that the system generates.

A

Power Amplifiers

36
Q

is biased so that it conducts continuously for 360° of an
input sine wave

A

Class A

37
Q

In class A amplifiers, bias is set so that the output ______

A

never saturates of cuts-off

38
Q

used primarily as small-signal voltage amplifiers or for low-power amplifiers.

A

Class A amplifier

39
Q

biased near cut-off

A

Class AB

40
Q

used primarily in push-pull amplifiers

A

Class AB

41
Q

biased at cut-off and conducts only one-half of the sine wave input

A

Class B

42
Q

Normally connected in a push-pull arrangement so that both positive and negative alternations of the input are amplified simultaneously

A

Class B

43
Q

The _______ amplifier, being the most efficient, makes a good power amplifier

A

Class C

43
Q

An amplifier whose output conducts load current during less than one-half cycle of an input sine wave

A

Class C

Communications 1 (7 decks)

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