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Q. Use necessary circuit and waveforms to explain the working of a Bootstrap sweep generator
The bootstrap circuit illustrated in figure given below is a commonly used method for achieving a constant charging current. Here, transistor Q1 acts as a switch and Q2 as an emitter follower which is connected across capacitor C. Therefore, the output voltage V0 will be approximately equal to the voltage across C. The transistor, therefore, provides a low resistance output terminal for the saw-toothed generator.
Initially, Q1 is ON and Q2 is OFF. Hence, C1 is charged to the supply voltage Vcc through diode D and the output voltage V0 is zero. When a negative pulse, as shown in waveform figure, is applied to the base of Q1 and Q1 is turned OFF. Now, capacitor C1 discharges and capacitor C starts charging through resistor R. As a result, the base voltage of Q2 and V0 start increasing from zero volts. Therefore, diode D becomes reverse biased. The value of capacitor C1 is much larger than that of capacitor C. The voltage across R remains substantially constant throughout the charging process and thus the charging current (iR) is maintained constant. So, capacitor C is charged with a constant current which causes the voltage across C, i.e. the output voltage V0 to increase linearly with time with the relation, V0 = Vcct/RC.
i need research publication help. The topic is PHASED ARRAY ANTENNA DESIGN for KU-band. I want a research paper that can be published in some conference.
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What is the use of latch signal on the AD0-AD15 bus in an 8086 system? Latch signal is used to load the data those are fetched from memory to bus.
Q. In the circuit shown in Figure the switch opens at t = 0. Develop and execute a P Spice program to solve for v(t), and use PROBE to obtain a plot of v(t). Hint: Use the follo
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Q. If the line of Problem 15.1.3 is made of copper whose resistivity ρ = 1.72×10 -8 ·m, determine the maximum length that can be used if losses are not to exceed 3 dB when f = 3
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