# Microelectronics by Sedra and Smith 8th edition Chapter 2157

###### 2.39 Design an op-amp circuit to provide an output vO = −[2v1 + (v2/2)]. Choose the lowest possible values of resistors for which the input current (from each input signal source) does not exceed 50 µA for 1-V input signals.
Solved19 views Selected answer as best
###### 2.38 A weighted summer circuit using an ideal op amp as shown in Fig. 2.10 has three inputs using 20- kΩ resistors and a feedback resistor of 50 kΩ. A signal v1 is connected to two of the inputs while a signal v2 is connected to the third. Express vO in terms of v1 and v2. If v1 = 1 V and v2 = −1 V, what is vO?
Solved22 views Selected answer as best
###### D 2.37 Design the circuit shown in Fig. P2.37 to have an input resistance of 100 kΩ and a gain that can be varied from −1 V/V to −100 V/V using the 100- kΩ potentiometer R4. What voltage gain results when the potentiometer is set exactly at its middle value?
Solved20 views Posted new comment
###### D 2.14 Design an inverting op-amp circuit for which the gain is −5 V/V and the total resistance used is 6 kΩ. R1 = 1 kΩ; R2 = 5 kΩ;
Solved31 views Selected answer as best
###### D 2.13 Given an ideal op amp, what are the values of the resistors R1 and R2 to be used to design amplifiers with the closed-loop gains listed below? In your designs, use at least one 10- kΩ resistor and another equal or larger resistor. (a)−1 V/V (b)−10 V/V (c)−20 V/V (d)−0.5 V/V
Solved30 views Selected answer as best
###### SIM 2.12 For ideal op amps operating with the following feedback networks in the inverting configuration, what closed-loop gain results? (a)R1 = 10 kΩ, R2 = 20 kΩ (b)R1 = 10 kΩ, R2 = 100 kΩ (c)R1 = 10 kΩ, R2 = 5 kΩ (d)R1 = 100 kΩ, R2 = 5 MΩ (e)R1 = 100 kΩ, R2 = 0.5 MΩ (a) −2 V/V; (b) −10 V/V; (c) −0.5 V/V; (d) −50 V/V; (e) −5 V/V
Solved32 views Selected answer as best
###### D 2.15 Using the circuit of Fig. 2.5 and assuming an ideal op amp, design an inverting amplifier with a gain of 26 dB having the largest possible input resistance under the constraint of having to use resistors no larger than 100 kΩ. What is the input resistance of your design?
Solved42 views Selected answer as best
###### 2.50 Derive an expression for the voltage gain, vO/vI, of the circuit in Fig. P2.50.
Solved52 views Selected answer as best
###### D2.8Use the idea presented in Fig. 2.11 to design a weighted summer that provides
Solved43 views Selected answer as best