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A transistor has the same parameters as those given in Exercise Ex4.1. In addition, the body effect coefficient is
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Microelectronics: Circuit Analysis and Design
- A boost converter is required to have an output voltage of 8 V andsupply a load current of 1 A. The input voltage varies from 2.7 to4.2 V. A control circuit adjusts the duty cycle to keep the outputvoltage constant. If the switching frequency is 200 kHz, determine:i. a value for the inductor such that the variation in inductorcurrent is no more than 40% of the average inductor current forall operating conditions.ii. a value for the capacitor such that the output voltage ripple isno more than 2%.iii. in case the OFF period is reduced by 30% for constantfrequency operation, find the new output voltagearrow_forwardQ4: Design a buck converter such that the output voltage varies between from 20V to 28V while the input voltage is 40V. The maximum load power is 200Wdc. Assume the switching frequency is 15kHz. (a) Design the converter such that it will be in continuous current mode. (b) The capacitor realized output voltage ripple must not be more than 1% at worst case. (c) The inductance realizes CCM at worst case. (d) Select the appropriate switch and other elements...arrow_forwardQ1: The circuits in Fig. P4.87(a) and (d) are connected as follows: The two input terminals are tied together, and the two output terminals are tied together. Sketch the transfer characteristic of the circuit resulting, assuming that the cut-in voltage of the diodes is 0.5 V and their voltage drop when conducting a current iD 21 mA is 0.7V. 20 www ΙΚΩ (a) +3V ty O 1kQ (d) * -3 V 10arrow_forward
- 2. In the emitter follower discussed in the lectures, the output (emitter) voltage is 0.7V below the input (base) voltage. One way to remove this offset is to use a diode as shown below left. Suppose our input Vi=2V. Assume beta = 100, VCE,SAT=0V, VBE,ON=0.7, and diode VF=0.7. +5V +5V 1000 R1 1N4148 500 100 Scattering Limit Vo 10 Vi o RL=10 R2 T, = 25 °C 0.1 1K 0 0.4 0.8 1.2 1.6 2.0 V, - Forward Voltage (V) 94 9170 a. Determine VB and V. b. Verify your assumed state of the BJT from (a) c. Verify your assumed state of the diode from (a) d. (Optional challenge) To provide good matching between the diode VF and VBE,ON, we need to have at least 1mA passing through ID, as shown in the datasheet figure above right. What is the maximum V; for which Ip is at least 1mA? To increase this limit, should we change R1 or R2 and in what direction (increase or decrease)? -Forward Current (mA)arrow_forwardQ4. A boost regulator has an input voltage of 5 V. The average output voltage is 15 V and the average load current is 0.5 A. The switching frequency is 25 kHz. If L=150 µH and C=220 µF, determine (a) the duty cycle (b) the ripple current of inductor (c) the peak current of inductor (d) the ripple voltage of filter capacitor and (e) the critical values of L and C.arrow_forward(a) Draw the dc and high-frequency ac equivalent circuits for the circuit as shown (b) What is the resonant frequency of the circuit for VC = 0 V if the diode is modeled by Cjo = 18 pF and φj = 0.9 V? (c) For VC = 10 V?arrow_forward
- The npn transistor is connected in a “diode” configuration. Use the transport modelequations to show that the i-v characteristics of thisconnection are similar to those of a diode as defined. What is the reverse saturation currentof this “diode” if IS = 4 × 10−15 A, βF = 100, andβR = 0.25?arrow_forwarda2/a-Design Circint as the following peseripton: A. the positive cycle of the vout signal is 3.2 and Neyatine cycle is 4.3 (Note: we must used preetical Diodes aned vin is tov) B- the pesitive cycles of vout is s-3 od Negative cycle is (5 4) [te:Comsider vin = 1ovavd we must used Capaetor with praeticul Didde)arrow_forwardQ.3 The input, Vs and the output, Vo of a diode circuit (assuming ideal diode) are shown 3 SEEU/SKEU 1063 in Figure A.2. Name an application that can produce output as in Figure A.2 (ii) and draw the circuit. S UTM S UTM UTM UTM S UTM S UTM O UTM 8 UTM UTM S UTM S UTM UTM UTM S UTM UTM MB UTM ot UTM UT S UTM B UTM UTM 8UTM (i) aUTM UT 8 UTM UTM UTM M UTM TM S UTM UTM UT MS UTM or (i) UTM Figure A.2 8 UTM UT TM S UTMarrow_forward
- Draw Zener regulator circuit to obtain regulated DC voltage 6.8 V. Considering input DC voltage in the range from 10V to 30V. Consider load resistance of 10KΩ.arrow_forwardQuestion 4. Design a C converter by drawing according to the values given below.The C ´uk converter has 24 V input and 36 V output providing 80 W load. In this case, choose Duty ratio, switching frequency, inductor dimensions so that the variation in inductor currents is not more than 5 percent of the average inductor current, output voltage fluctuation is less than 1 percent and voltage fluctuation at C1 is less than 5 percent.arrow_forward2. In the emitter follower discussed in the lectures, the output (emitter) voltage is 0.7V below the input (base) voltage. One way to remove this offset is to use a diode as shown below left. Suppose our input Vi=2V. Assume beta = 100, VCE,SAT=OV, VBE,ON=0.7, and diode Vş=0.7. +5V +5V 1000 R, 500 1N4148 100 Scattering Limit Vo 10 Vio RL=10 R2 -T,= 25 °C 0.1 1K 0.4 0.8 1.2 1.6 2.0 V, - Forward Voltage (V) 94 9170 a. Determine VB and Vo b. Verify your assumed state of the BJT from (a) c. Verify your assumed state of the diode from (a) d. (Optional challenge) To provide good matching between the diode V; and VBE,ON, we need to have at least 1ma passing through Io, as shown in the datasheet figure above right. What is the maximum V, for which Ip is at least 1mA? To increase this limit, should we change R1 or R2 and in what direction (increase or decrease)? 1,- Forward Current (mA)arrow_forward
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