ELECTRONIC CIRCUITS

The input power to a device is 10,000 W at a voltage of 1,000 V. The output power is 500 W and the output impedance is 20 Ω. Find the voltage gain in decibels

• -13 dB

• -20 dB

• -10 dB

• -3 dB

Two stages have voltage gains of 100 and 200. The total decibel voltage gain is

• 46 dB

• 66 dB

• 86 dB

• 106 dB

A two-pole high-pass active filter would have a roll-off rate of

• 40 dB/decade

• -40 dB/decade

• 20 dB/decade

• -20 dB/decade

If f_unity is 10 MHz and midband open-loop voltage gain is 1,000,000, then the open-loop cutoff frequency of the op-amp is

• 10 Hz

• 20 Hz

• 50 Hz

• 100 Hz

The center frequency of a bandpass filter is always equal to

• The bandwidth

• Geometric average of the cutoff frequencies

• Bandwidth divided by Q

• 3-dB frequency

Determine the quality factor of a bandpass filter with a lower cutoff frequency of 20.1 kHz and an upper cutoff frequency of 20.3 kHz.

• 10

• 10.1

• 101

• 202

For a passive bandpass filter using RLC circuit, which of the following below is the expression for its bandwidth?

• BW = 1/(2*pi*sqrt(L*C))

• BW = 1/(2*pi*f*C)

• BW = R/(2*pi*L)

• BW = R/(2*pi*f*L)

The bandwidth in a ______ filter equals the critical frequency.

• low-pass

• high-pass

• band-pass

• band-stop

What is the level of the roll-off in most op-amps?

• -6 dB/decade

• -20 dB/octave

• -6 dB/decade or -20 dB/octave

• -20 dB/decade or -6 dB/octave

What is this circuit?

• a low-pass filter

• a high-pass filter

• a bandpass filter

• a band-stop filter