For the circuit shown, find currents 1, 2, 3, and the voltage V, Assume ideal op-amp, and tex R₁ =2, Ry=20, Ro=170 and 1,-1 1 R₁ ww R₂ The current l is: 1 The currently is: f The current lg is: The voltage V, 15: -20 The relative tolerance for this problem is 3%. Ro Vo

I need help with Op-amp. tnx

Q4: Design a buck converter to produce an output voltage of 18 V across a 10-_ load resistor. The output voltage ripple must not exceed 0.5 percent. The dc supply is 48 V. Design for continuous inductor current. Specify the duty ratio, the switching frequency, the values of the inductor and capacitor, the peak voltage rating of each device, and the rms current in the inductor and capacitor. Assume ideal components. DE

Consider the following circuit using diode and Op-Amp. Assume ideal Op-Amp with output saturation at +-13V. Assume diode forward drop is 0.7V. a. Find Vo and VA when Vin = 1V and 3V. b. Find V, and VA when Vin = -1V and -3V. R Vin R VA ovo ER₂

(c) (d) Figure Figure Q1b shows an Op-amp with a bias current compensating resistor (Rp). R₁ V₂. Vp IB. R₂ W A • V₂ Figure Olb (i) Derive an expression for V. to quantify the effect of bias currents IB+ and IB-. [3] (ii) Explain how you would choose a value for Rp to reduce the output error due to the bias currents, IB+ and IB.. [3] Referring to an op-amp define what is meant by common-mode rejection ratio (CMRR) and explain the effect a finite CMRR would have on high-precision applications. [4] Page 2 of 7 Continued overleaf

Discuss what a difference amp is, give equations and details, what is a single-ended and differential signal, what is a 4-20 mA signal, what is common-mode noise and why is a difference amp used?

9. Suppose we design an inverting amplifier using 5% tolerance resistors and an ideal op-amp. The nominal amplifier gain is -20. Answer the following two questions: a. What are the minimum and maximum possible gains? b. What is the percent tolerance of the gain?

The dc converter in the next figure has a resistive load, R = 15 and input voltage, Vs = 240 V. When the converter remains on, its voltage drop is Vch = 1.75 V and chopping) frequency is f = 15 kHz. If the duty cycle is 90%, determine (a) the average output voltage Va, (b) the rms output voltage Vo, € the converter efficiency, (d) the effective input resistance Ri, and € the rms value of the fundamental component of harmonics on the output voltage. + VH Converter Vs t=0 + SW ίο 01 R

Ex) A standard two-junction thermocouple configuration is being used to measure the temperature in a wind tunnel. The reference junction is held at a constant temperature of 10 °C. We have only a thermocouple table referenced to 0 °C. Determine the output voltage when the measuring junction is exposed to an air temperature of 100 °C.

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