List of top Nanoelectronics Questions on Op-Amps

Which of the following are ideal features of an operational amplifier ?
• [A.] Very high input impedance
• [B.] Very high voltage gain
• [C.] High output impedance
• [D.] High slew rate
• [E.] Low CMRR Choose the correct answer from the options given below :

Calculate the resonant frequency of the Wien Bridge Oscillator given below :

\[ R_1 = R_2 = 51\,k\Omega \] \[ C_1 = C_2 = 0.001\,\mu F \]

Consider a modulating signal \(m(t)=2\sin(2\pi 10^3 t)\) is used to modulate a carrier of frequency \(10^6\) Hz. Find the bandwidth for phase modulation. Use phase modulation index \(=10\) units.

An angle-modulated signal with carrier frequency \(\omega_c = 2\pi \times 10^5\) is described by the equation. \[ \Phi_{em}(t)=10\cos(\omega_c t+5\sin 3000t+10\sin 2000t) \] The power of the modulated signal is :

In an op-amp which of the following parameters depend on frequency. A. Voltage gain B. Noise current C. CMRR D. Output voltage swing E. Gain bandwidth product Choose the correct answer from the options given below :

Which of the following statements are correct A. A negative feedback can increase linearity and reduce distortion. B. Positive feedback always improves stability of the amplifier. C. Series-shunt (voltage) negative feedback tends to reduce output impedance. D. Closed-loop bandwidth typically increases when negative feedback is applied. Choose the correct answer from the options given below :

Calculate the output voltage of an op-amp for input voltages of \(V_{i1}=150\mu V\) and \(V_{i2}=140\mu V\). The amplifier has a differential gain of \(A_d=4000\) and the value of CMRR is \(100\):

For an op-amp having a slew rate of \(4 \text{ V}/\mu s\), what is the maximum closed-loop voltage gain that can be used when input signal varies by \(0.1V\) in \(10\mu s\)?

Express \(v_{\text{out}}\) in terms of \(v_{\text{in}}\) for the given circuit, assuming the op-amp is ideal.

Considering the op-amp to be ideal, the \(v_{\text{out}}\) is expressed as: