why do we use negative feedback in Amplifiers?

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?

Explain how an inverting amplifier differs from a noninverting amplifier.

A differential amplifier is characterised by a common-mode gain, A cm from figure 2. Determine the CMRR of the amplifier. Round your answer to one decimal place and do not type any letters in the answer box. Your answer must be purely numerical! Click here for Figure 1 Figure 1 Common-mode output voltage, vocm (V) 4 2 0 -2 -4 -6 -1 Vocm versus Vicm which may be derived from figure 1, and a differential gain, A,, which may be derived " 0 Common-mode input voltage, Vicm (V) 1