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set17new - ECE3050 Assignment 17 1 The gures show inverting...

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ECE3050 — Assignment 17 1. The f gures show inverting ampli f er circuits. (a) For the circuit of Fig. (a), specify R 1 , R F ,and R O for a voltage gain of 50 ,an input resistance of 2k , and an output resistance of 1k . If the op amp clips at a peak output voltage of 12 V , specify the maximum peak input voltage if the op amp is not to be driven into clipping. Answers: R 1 =2k , R F =100k , R O =1k ,and ¯ ¯ v I ( peak ) ¯ ¯ =0 . 24 V . (b) Fig. (b) shows the circuit of Fig. (a) with a load resistor connected to the output. Calculate the new voltage gain if R L =1k . What is the maximum peak output voltage if the op amp is not to clip? Answers: v O /v I = 25 and ¯ ¯ v O ( peak ) ¯ ¯ =6V . (c)Repeatpart(b)i fthec ircu itismod i f edasshowninF ig .(c) .Answers : v O /v I = 50 and ¯ ¯ v O ( peak ) ¯ ¯ =5 . 97 V . Hint, use voltage division to solve for ¯ ¯ v O ( peak ) ¯ ¯ in terms of ¯ ¯ ¯ v 0 O ( peak ) ¯ ¯ ¯ . 2. Fig. (a) shows an inverting ampli f er with a T feedback network. Fig. (b) shows the ampli f er with a Thévenin equivalent made looking into the feedback network from the input. The ampli f er is to be designed for an input resistance of 1k and a voltage gain of 1000 .I f R 2 = R 4 and R 3 =100 , specify the value of R 2 and R 4 .An sw e r s : R 1

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3. Show that the same expression for the voltage gain of the circuit in f gure (a) of problem 2 is obtained if Norton equivalent circuits are made looking out of the negative input through R 1 and R 2 and the sum of the two Norton currents is set to zero. Hint: First show that the Norton current looking into R 2 is [ v O / ( R 4 + R 2 k R 3 )] × R 3 / ( R 2 + R 3 ) . 4. The f gure shows a current to voltage converter. The circuit is to be designed to convert an input current of 50 µ A into an output voltage of +4 V . (a) Calculate the required value of
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set17new - ECE3050 Assignment 17 1 The gures show inverting...

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