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Taft, Pierce and negative feedback
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Pierce, Fenner and Beane
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Taft, Hartley and Pierce
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Correct AnswerColpitts, Hartley and Pierce
just remember CHiPs!
Hint2: three ... answer starts with 'c'
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It must have at least two stages
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It must be neutralized
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Correct AnswerIt must have positive feedback with a gain greater than 1
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It must have negative feedback sufficient to cancel the input signal
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Correct AnswerThrough a tapped coil
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Through a capacitive divider
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Through link coupling
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Through a neutralizing capacitor
The Hartley oscillator is an electronic oscillator circuit in which the oscillation frequency is determined by a tuned circuit consisting of capacitors and inductors, that is, an LC oscillator. The circuit was invented in 1915 by American engineer Ralph Hartley. The distinguishing feature of the Hartley oscillator is that the tuned circuit consists of a single capacitor in parallel with two inductors in series (or a single tapped inductor), and the feedback signal needed for oscillation is taken from the center connection of the two inductors.
http://en.wikipedia.org/wiki/Hartley_oscillator
Test Tip: Hartley is pretty close to Harley, which are notorious for leaking oil. Coil is pretty close to oil.
Test Tip: Hartley has "tl" in it. Tapped L
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Through a tapped coil
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Through link coupling
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Correct AnswerThrough a capacitive divider
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Through a neutralizing capacitor
http://en.wikipedia.org/wiki/Colpitts_oscillator
Think C for Colpitts and Capacitor, and voltages supplied by dividers.
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Through a tapped coil
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Through link coupling
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Through a neutralizing capacitor
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Correct AnswerThrough a quartz crystal
The Pierce oscillator is a type of electronic oscillator particularly well-suited for use in piezoelectric crystal oscillator circuits. Named for its inventor, George W. Pierce (1872-1956), the Pierce oscillator is a derivative of the Colpitts oscillator.
Components: a single digital inverter, two resistors, two capacitors, and the quartz crystal, which acts as a highly selective filter element.
http://en.wikipedia.org/wiki/Pierce_oscillator
Memory aids:
- Pierce = Piezo
- Don't get pierced with a quartz crystal.
- "Pierced" ears have crystal earrings.
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Pierce and Zener
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Correct AnswerColpitts and Hartley
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Armstrong and deForest
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Negative feedback and balanced feedback
A Colpitts oscillator is a type of LC oscillator, so called because it consists of an inductor, represented by the letter L, and a capacitor, represented by the letter C. It mimics a Hartley oscillator, in that the inductive voltage divider from a pair of coils, or a tapped coil is fed into the LC circuit.
by kd0swn
Hint: Colpitts and Hartley is the only answer with two types of oscillators. A Zener is a diode voltage regulator, Armstrong and De Forest were inventors and all oscillators employ some sort of negative feedback.
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An oscillator in which the output is fed back to the input by the magnetic field of a transformer
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A crystal oscillator in which variable frequency is obtained by placing the crystal in a strong magnetic field
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Correct AnswerA UHF or microwave oscillator consisting of a diode vacuum tube with a specially shaped anode, surrounded by an external magnet
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A reference standard oscillator in which the oscillations are synchronized by magnetic coupling to a rubidium gas tube
A UHF or microwave oscillator consisting of a diode vacuum tube with a specially shaped anode, surrounded by an external magnet.
Hint: Magnetrons are used in microwaves (kitchen appliance).
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Correct AnswerAn oscillator based on the negative resistance properties of properly-doped semiconductors
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An oscillator based on the argon gas diode
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A highly stable reference oscillator based on the tee-notch principle
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A highly stable reference oscillator based on the hot-carrier effect
Wikipedia.org - Gunn diode link:
http://en.wikipedia.org/wiki/Gunn_diode
Easy to remember Guns and dope go together.
Last edited by jmsian. Register to edit
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Correct AnswerA direct digital synthesizer
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A hybrid synthesizer
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A phase locked loop synthesizer
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A diode-switching matrix synthesizer
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The phase relationship between a reference oscillator and the output waveform
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Correct AnswerThe amplitude values that represent a sine-wave output
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The phase relationship between a voltage-controlled oscillator and the output waveform
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The synthesizer frequency limits and frequency values stored in the radio memories
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Broadband noise
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Digital conversion noise
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Correct AnswerSpurious signals at discrete frequencies
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Nyquist limit noise
Just Remember Triple S. Spectral Synthesizers Spurious
Al
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Phase splitter
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Hex inverter
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Chroma demodulator
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Correct AnswerPhase accumulator
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Correct AnswerThe frequency range over which the circuit can lock
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The voltage range over which the circuit can lock
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The input impedance range over which the circuit can lock
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The range of time it takes the circuit to lock
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An electronic servo loop consisting of a ratio detector, reactance modulator, and voltage-controlled oscillator
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An electronic circuit also known as a monostable multivibrator
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Correct AnswerAn electronic servo loop consisting of a phase detector, a low-pass filter, a voltage-controlled oscillator, and a stable reference oscillator
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An electronic circuit consisting of a precision push-pull amplifier with a differential input
A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input signal. While there are several differing types, it is easy to initially visualize it as an electronic circuit consisting of a variable frequency oscillator and a phase detector.
Hint: surprisingly only one answer has the word "phase" in it. So, you need to “detect” the word phase, as in the answer which has “phase detector” in it.
Last edited by ironcal67. Register to edit
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Wide-band AF and RF power amplification
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Comparison of two digital input signals, digital pulse counter
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Photovoltaic conversion, optical coupling
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Correct AnswerFrequency synthesis, FM demodulation
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Any amplitude variations in the reference oscillator signal will prevent the loop from locking to the desired signal
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Correct AnswerAny phase variations in the reference oscillator signal will produce phase noise in the synthesizer output
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Any phase variations in the reference oscillator signal will produce harmonic distortion in the modulating signal
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Any amplitude variations in the reference oscillator signal will prevent the loop from changing frequency
Hint: "Synthesizer" in the question and "Synthesizer" in the answer.
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It generates FM sidebands
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It eliminates the need for a voltage controlled oscillator
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Correct AnswerIt makes it possible for a VFO to have the same degree of frequency stability as a crystal oscillator
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It can be used to generate or demodulate SSB signals by quadrature phase synchronization
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Correct AnswerPhase noise
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Digital conversion noise
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Spurious signals at discrete frequencies
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Nyquist limit noise
A phase-locked loop uses an oscillator to provide the source-clock for state changes. The stability of that clock has a significant effect on the noise and when you consider the type of instability you'd expect in an oscillator used as a square wave source clock for a PLL the noise isn't going to be voltage shift in the clock, it's going to be slight early or late switches from high to low values in the clock and vice-versa. Viewed in the frequency domain that appears to be slight frequency drift in the clock giving the clock and PLL an output signal that isn't a single frequency but has a small bandwidth of frequencies (noisy).
Viewed in the time domain then because it's a square wave clock that noise appears to be phase-drift (early or late phase changes) in the clock and it is known as phase-noise.
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