Radio-Frequency Circuits: High-Frequency Effects Quiz

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What is a key consideration when selecting an oscillator?

Physical size

Output power

Frequency stability (correct)

Distortion requirements

In a lead-lag network, what happens at extremely low frequency?

Maximum output voltage

Phase shift across the network leads

Phase shift across the network lags

No output due to an open circuit (correct)

What is the purpose of AGC (Automatic Gain Control) in the bridge circuit?

To increase distortion

To reduce the output power

To compensate for unbalances in the bridge (correct)

To limit the frequency range

What is the effect at extremely high frequency in a lead-lag network?

No output due to a short circuit Signup and view all the answers

Which part of the Wien-Bridge Oscillator provides positive feedback?

Resistive voltage divider Signup and view all the answers

What is the key characteristic that AGC compensates for in the amplifier circuit?

Variations in component values Signup and view all the answers

What are the two kinds of oscillators mentioned in the text?

Self-sustaining and continuous Signup and view all the answers

According to the Barkhausen Criterion, what must the phase shift be in a feedback circuit to sustain oscillation?

Positive integer multiple of 1 Signup and view all the answers

What are the four requirements for a feedback oscillator to work, as mentioned in the text?

Positive feedback, Regenerative, Excessive amplitude, Insufficient amplitude Signup and view all the answers

What determines the frequency of operation in an oscillator circuit?

Resistors, capacitors, inductors, or crystals Signup and view all the answers

In a closed-loop feedback amplifier, what does the open-loop voltage gain represent?

Transfer function of the feedback network Signup and view all the answers

What are the most common configurations for oscillators mentioned in the text?

RC phase shift and LC tank circuits Signup and view all the answers

As frequencies increase, what happens to inductive reactance?

Increases Signup and view all the answers

What is the term used when the two reactances (inductive and capacitive) in a circuit are equal?

Self-resonate Signup and view all the answers

What happens to stray capacitances and inductances on a printed circuit board as the frequency increases?

They are considered distributed along the length of the board Signup and view all the answers

What is a common technique used to reduce stray capacitances and inductances in high-frequency circuits?

Keeping traces and wires short and well separated Signup and view all the answers

Which amplifier class conducts for less than 180° of the input cycle?

Class C Signup and view all the answers

What is a common problem associated with inter-electrode capacitance and inductance in RF circuits?

Miller Effect Signup and view all the answers

How do wideband amplifiers typically compensate for higher low-frequency gain as frequency increases?

Decrease negative feedback Signup and view all the answers

Which class of amplifiers is very efficient in RF applications but inherently induces severe distortion?

Class C Signup and view all the answers

What is used to cancel unwanted feedback in RF circuits that may cause oscillations?

"Neutralization" Signup and view all the answers