G Design single input op-amp circuits with with closed loop gains of −10, +10, +1 and −1. Use 10kΩ for the feedback resistor Rf in your designs. What type of feedback is used in the ±10 gain amplifiers? Explain with appropriate equations the effect of feedback on input and output resistances of the amplifier circuits.

Explanation:

For Gain of −10

Inverting op-amp gain is given by

The negative sign represents output signal being phase shifted by 180°

Ω  

For Gain of −1

Ω

For Gain of +10

Non-inverting op-amp gain is given by

Ω

For Gain of +1

To get a Gain of +1, make  which results in ∞

The output is directly connected to the input which makes equal to Therefore, giving a gain of exactly 1.

This kind of design configuration is also known as Voltage Follower.

Negative feedback is being used to design these op-amp amplifiers.

Negative feedback increases the stability at the cost of reduced gain.

The gain is reduced by a factor of  

Negative feedback reduces noise and distortion and improves frequency response of the amplifier.

An ideal op-amp should have infinite input resistance and zero output resistance. Negative feedback increases the input impedance and reduces the output impedance.

think about the oscillation of the toy shown in the video. when the toy is at the highest point of its motion, its velocity is zero and its acceleration is negative.

wavelegth as in spectrum red oygbiv