Ifthe voltage gain of an amplifier without feedback is 20 and with negative feedback it is 12, then feedback fraction is ?
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- The voltage gain of an amplifier is 3000 when no feedback is applied. When negative feedback is applied and feedback factor is 0.01, then estimate the gain with feedback.Assume that the R2/R1 ratio of a feedback amplifier with voltage supply of +/- 10 V is 3.4 and that a value of 8.5 V is applied to the inverting input of the op-amp. What is the output voltage value?Q) An amplifier has an open-loop gain of 100 and a feedback ratio of 0.4. If the open-loop gain changes by 30% due to temperature, the percentage change in gain of the amplifier with feedback will be (a) 0.73% (b) 0.52% (c) 0.28% (d) 0.45%
- Assume that the R2/R1 ratio of a feedback amplifier with voltage supply of +/- 10 V is 3.0 and that a value of 1.0 V is applied to the non inverting input of the op-amp. What is the output voltage value?The voltage gain of an amplifier without feedback is 3000. What will be the voltage gain of the amplifier with negative feedback if the feedback factor is 0.01?The voltage gains of an amplifier without feedback and with negative feedback, are 100 and 20, respectively. The percentage of negative feedback is:
- Calculate the gain of a negative feedback amplifier having A = -3000 and beta= -1/100.Discuss what type of feedback will you use in an amplifier to : 1 ) : increase input impedance 2): decrease input impedance , and why ?Given the four statements below, which of the following statements are true about op- amp with negative feedback arrangement? i. Negative feedback drive the op-amp to saturation with Vo =+Vsat. 1i. Negative feedback reduces the gain of the op-amp circuit to desired valuc. iii. Negative feedback controls the frequency response of the op-amp cireuit. iv. Negative feedback maintains the oscillations. O, ii, i Oi, ii, iv
- Q) An amplifier has an open- loop gain of 100 and a feedback ratio of 0.4. If the open-loop gain changes by 30% due to temperature, the percentage change in gain of the amplifier with feedback will be *A negative voltage feedback amplifier has voltage gain without feedback, A, = 1000 and feedback fraction m, = 0.01. If the lower cutt-off frequency f₁ = 1.5 kHz and upper cut-off frequency ₂ = 501.5 kHz before feedback, what is the value of lower cutt- off frequency after negative feedback?Calculate the sensitivity of the of the feedback amplifier to changes in forward-amplifier gain, given that A = 833 and B = 0.0018. Calculate the answer to three significant figures.