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Q.1. (a) An op-amp has CMRR = 100dB, differential gain Ap = 5 and common mode voltage applied to it is 3 mV. Find the value of common mode output voltage. (b) An op-amp has differential gain AD = 100. Common mode voltage applied to it is 3 mV and corresponding output voltage is 0.03 V. Find the value of CMRR in dB. Q.2. Consider the circuit shown in figure below. 5kQ 1000 pF {1kQ 2kQ (a) Find the frequency above which the gain will decrease by 20 dB per decade. (b) Find the magnitude of gain at operating frequency of 40 kHz. (c) Find the phase angle () at 40 kHz. Q.3. For the circuit shown in figure draw output waveform. (a) V 201 (b) 201 V In SV V In 37/7 2k 2k 2k www 2k MISV V-15V 110v V-10V Q.4. Consider the circuit shown in figure below. + 10k 15k 10k 1nF 1nF 5k *+15V/ -15V Vo (a) Find the frequency above which the gain will decrease by 40 dB per decade. (b) Find the magnitude of gain at operating frequency of 20 kHz. Q.5. An amplifier has a voltage gain of 500, input impedance 20 kQ, output impedance 75 Q and bandwidth is 10 Hz without any feedback. Now a negative feedback with B = 0.1 is applied. Find (a) Its gain (b) Input impedance (c) Output impedance (d) Its bandwidth Q.6. Consider the circuit shown in figure below. 2nF 10 :3kQ2 6k (a) Find the frequency upto which the gain will increase by 20 dB per decade. (b) Find the magnitude of gain at operating frequency 4 kHz and 6 kHz. (c) Find the phase angle () at 6 kHz. Q.7. Find the output voltage Vo of the OPAMP circuit shown in figure below 3R (a) (b) R 170-W R 2V0-WWW R 3 Vo-W R/ K 2 Vzom Vom R/K] ww> R(K +K, 1) V 07 Q.8. Consider the circuit shown in figure below. Vin 5nF www 10k3 15k 5nF HH 10k www + 5k 4+15V/ -15V (a) Find the frequency upto which the gain will increase by 40 dB per decade. (b) Find the magnitude of gain at operating frequency of 2 kHz. Q.9. In an ideal Op-Amp circuit shown below Vi = Vm sinwt. (a) Find the amplitude of Vo. (b) Find the peak value of current through R1. (c) Find the peak value of current through R2. (c) Find the peak value of potential at P. V P www R www R oVo