Radio-Frequency Circuits

Front

What is the purpose of modulating a signal?

Back

To use an information signal to modify a carrier signal.

Front

What is a baseband signal?

Back

A signal that is modulated to carry information.

Front

What types of components are used to meet the conditions for RF circuits?

Back

RF Amplifiers, Oscillators, Mixers, and frequency synthesizers.

Front

How do capacitors behave at very low frequencies?

Back

They act as an open circuit to DC voltages and a short circuit for AC.

Front

What happens to component interaction as frequency increases?

Back

It becomes more critical, including stray reactances, inductances, and capacitances.

Front

What is the effect of frequency on inductive and capacitive reactance?

Back

Inductive reactance increases and capacitive reactance decreases as frequency increases.

Front

What are lumped and distributed constants in RF circuits?

Back

At low frequencies, capacitances and inductances are negligible (lumped), but at high frequencies, they are considered distributed along the circuit board.

Front

What techniques are used in high-frequency construction?

Back

Short and well-separated traces, right-angle conductors, toroidal cores, and shielding.

Front

How do RF amplifiers differ from audio amplifiers?

Back

RF amplifiers may not require wide bandwidth or linearity of output.

Front

What is the Miller Effect in RF circuits?

Back

It refers to the multiplication of inter-electrode capacitance effects, particularly in common-emitter amplifiers.