1)Suppose you want to design a non-inverting amplifier (see( Figure 1 ) ) with a

Question

1)Suppose you want to design a non-inverting amplifier (see(Figure 1) ) with a gain of 6, using a 75 k? resistor in the feedback path and Rs = 15.0 kohms.

Suppose you wish to amplify input signals in the range ?2.5V?vg?2V. What are the minimum values of the power supplies that will keep the op amp in its linear operating region?

2) Consider the following op-amp circuit, where vin = 2V. The Op-Amp is powered by 15V power sources. R1 = 10 k? and R2 = 35 k?.  

If the op amp can provide at most +/- 35 mA, what is the smallest load resistor you could have before hitting the current limit of the op amp?

1)Suppose you want to design a non-inverting amplifier (see(Figure 1) ) with a gain of 6, using a 75 k? resistor in the feedback path and Rs = 15.0 kohms. Suppose you wish to amplify input signals in the range ?2.5V?vg?2V. What are the minimum values of the power supplies that will keep the op amp in its linear operating region? 2) Consider the following op-amp circuit, where vin = 2V. The Op-Amp is powered by ½15V power sources. R1 = 10 k? and R2 = 35 k?. If the op amp can provide at most +/- 35 mA, what is the smallest load resistor you could have before hitting the current limit of the op amp?

Explanation / Answer

2) Vout = - (R2 / R1) Vi

=> Vout = - 3.5 (2) = - 7 V

so smallest load = |Vout| / Imax = 7 / 35 mA = 200 ohms

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