Quiz Active Filter 20250125

When design an Elliptic lowpass filter with specification passband Rp=1 dB, pass frequency wp=1 rad/s, ws=1.5wp and As>=40dB. Which specification is not needed to verify?

• 3dB cut-off frequency
• stopband attenuation from w=ws
• passband ripple Rp
• pass frequency wp

What is the distribution of poles for design a Butterworth active lowpass filter using Sallen and Key filter for filter order n=5?

• 2+2+1
• 2+3
• 3+2
• 1+1+1+1+1

Which filter below cannot be used with Sallen and Key filter?

• Elliptic
• Bessel
• Butterwoth
• Chebyshev-I

What is the distribution of poles for design a Chebyshev-II active lowpass filter for filter order n=6?

• 2+2+2
• 3+3
• 2+3+1
• 3+2+1

What is the advantage of the Sallen and Key filter?

• fewer number of components
• cut-off frequency have no limitation
• quality factor can be higher than 50
• cut-off frequency does not depend on which Op-Amp to be used

If the bandwidth of an Op-Amp is from 0Hz to 2 MHz with gain equal 10. What is the limitation of cut-off frequency to design Butterworth filter n=2?

• 5 MHz
• 2 MHz
• 1 MHz
• 4 MHz

For Sallen and Key filter, if the source impedance is 50 Ohms, what is the most suitable value for resistor used in filter circuit?

• 50 Ohms
• 100 Ohms
• 5000 Ohms
• 500 Ohms

If the bandwidth of an Op-Amp is from 10 kHz to 100 kHz with gain equal 2. What is its gain bandwidth product?

• 180 kHz
• 90 kHz
• 100 kHz
• 200 kHz

What is the value of normalized value of the capacitor in single real pole active Sallen and Key filter if the real pole is p=-2 and resistor R=1 Ohm?

• 0.5 F
• 2 F
• 0.25 F
• 1 F

What is the value of normalized value of the capacitors for a complex pole pair of active Sallen and Key filter if the complex pole pair is p1=-1+j1 and p2=-1-j1 and resistor R1=R2=1 Ohm?

• C1=0.5 F, C2=0.7071 F
• C1=0.7071 F, C2=0.7071 F
• C1=C2=1 F
• C1=0.7071 F, C2= 1 F