Quiz 2

A noninverting closed-loop op-amp circuit generally has a gain factor:

• equal to one

• greater than one

• of zero

• less than one

An ideal operational amplifier has

• infinite output impedance

• zero input impedance

• infinite bandwidth

• None of these

In order for an output to swing above and below a zero reference, the op-amp circuit requires:

• a negative and positive supply

• a resistive feedback network

• zero offset

• a wide bandwidth

An ideal op-amp requires infinite bandwidth because

• Signals can be amplified without attenuation

• Output common-mode noise voltage is zero

• Output voltage occurs simultaneously with input voltage changes

• Output can drive infinite number of device

A Differential Amplifier amplifies

• Input signal with higher voltage

• Input voltage with smaller voltage

• Sum of the input voltage

• None of the Mentioned

Find the output voltage of an ideal op-amp. If V₁ and V₂ are the two input voltages

• V_O= V₁-V₂

• V_O= A×(V₁-V₂)

• V_O= A×(V₁+V₂)

• V_O= V₁×V₂

The second-order low pass filter has a roll-off rate of _____

• - 20 db/decade       

• - 6 db/decade    

• - 40 db/decade    

• None of these

The procedure used to convert an original cut-off frequency to new cutoff frequency called_______

• voltage scaling    

• amplitude scaling

• Frequency scaling       

• Both a & b

Design a circuit for a second order low pass filter having cut off frequency of 1 KHz. (C= 0.01µF) & R1=10K

• R = 15.9KΩ & Rf = 5.86 KΩ

• R = 159KΩ & Rf = 586 KΩ

• R = 17.9KΩ & Rf = 8.86 KΩ

• R = 15.9Ω & Rf = 5.86 Ω

Design a circuit for a second order low pass filter having cut off frequency of 2 KHz and pass band gain of 1.5. Also plot the frequency response for designed filter. [Assume C = 0.01μf & R₁ = 10KΩ ]

• R=7.9KΩ & R_f = 5 KΩ

• R=79KΩ & R_f = 8 KΩ

• R=7.9Ω & R_f = 5 Ω

• R=1.9KΩ & R_f = 4 KΩ