When does a resistance provide a negative feedback to an amplifier?

Resistance is connected between the positive input terminal and the output terminal

Resistance is connected between the negative input terminal and the output terminal

Resistance is connected between the input terminals

Resistance is connected between the negative input terminal and ground

The effect of the inverting configuration is

The output signal and the input signal are out of phase by 180 o

The output signal and the input signal are in phase

The output phase is leading the input phase by 90 o

The output phase is lagging behind the input phase by 90 o

For an ideal negative feedback configuration which of the following is true?

There is a virtual open circuit between the input terminals

The closed loop gain for a negative feedback does not depend only on the external parameters

There is a virtual short circuit between the input terminals

There is a virtual ground at the negative input terminal

The negative feedback causes

The voltage between the two input terminals to the very small, ideally zero

The voltage between the two input resistance very high, ideally infinite

Current flow through the positive input terminal and no current flows through the negative input terminal

The non-inverting closed loop configuration features a high resistance. Therefore in many cases unity gain follower called buffer amplifier is often used to

Connect a high resistance source to high resistance load

Connect low resistance source to low resistance load

Connect low resistance source to a high resistance source

Connect high resistance source to a low resistance load

The advantage of a weighted summer operational amplifier is

It is capable of summing various input voltages together

Each input signal may be independently adjusted by adjusting the corresponding input resistance

If one needs both sign of a voltage signal then two operational amplifiers are needed

The following is a circuit of weighted summer capable of summing coefficients of both sign. The expressions for the output voltage v 0 is

v 0 = v 1 (R1/Ra ) (Rc/Rb ) + v 1 (Ra/R2 ) (Rc/Rb ) – v 1 (Rc/R3 ) – v 1 (Rc/R4 )

v 0 = – v 1 (R1/Ra ) (Rc/Rb ) – v 1 (Ra/R2 ) (Rc/Rb ) + v 1 (Rc/R3 ) + v 1 (Rc/R4 )

v 0 = v 1 (Ra/R1 ) (Rc/Rb ) + v 1 (Ra/R2 ) (Rc/Rb ) – v 1 (Rc/R3 ) – v 1 (Rc/R4 )

v 0 = – v 1 (Ra/R1 ) (Rc/Rb ) – v 1 (Ra/R2 ) (Rc/Rb ) + v 1 (Rc/R3 ) + v 1 (Rc/R4 )

In the non-inverting configuration of operational amplifier

The positive terminal is connected to the ground directly

The negative terminal is connected to the ground directly

The positive terminal is connected to the power source

The negative terminal is connected to the power source

For ideal non-inverting operational amplifier

Input and output resistances are infinite

Input resistance is infinite and output resistance is zero

Input resistance is zero and output resistance is infinite

Input and output resistances are zero

Which of the following is not true for a voltage follower amplifier?

Input voltage is equal to output voltage

Input resistance is infinite and output resistance is zero

For designing a non-inverting amplifier with a gain of 2 at the maximum output voltage of 10 V and the current in the voltage divider is to be 10 μA the resistance required are R 1 and R 2 where R 2 is used to provide negative feedback. Then

R 1 = 0.5 MΩ and R 2 = 0.5 MΩ

R 1 = 0.5 kΩ and R 2 = 0.5 kΩ

It is required to connect a transducer having an open-circuit voltage of 1 V and a source resistance of 1 MΩ to a load of 1-kΩ resistance. Find the load voltage if the connection is done

0.1 μV and 0.1 mV respectively

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