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Q. What is the basic principle of oscillators?
In an oscillating circuit, the amplitude of voltage or current oscillations decays with time owing to the dissipation of energy in the resistance contained in the circuit. If a negative resistance is incorporated in the circuit to generated energy that compensates for the loss of energy through the passive resistance, oscillations with undiminished amplitude can occur. Basically, therefore, a negative resistance must be provided in an oscillator. This is accomplished in a feedback oscillator by providing an external positive feedback to make the overall gain infinite. In a negative resistance oscillator, the desired negative resistance is supplied by internal positive feedback.
No external signal is applied to an oscillator. When the power supply to the system is switched on, a noise voltage is produced. The frequency spectrum of noise being very wide, it always has a voltage component at the frequency required for the oscillator. Thus the initial signal to trigger the oscillations is obtained from the noise voltage. The ac power of the output signal is supplied by the dc supply source.
Q. Common-Drain JFET Amplifier? Figure (a) shows a CD JFET amplifier in which resistors R 1 , R 2 , and R SS are selected by the bias design, and capacitors CG and CS are chos
an 8 bit successive approximation adc has a resolution of 20mv. what will be its ouput analogue input of 2.17v
Q. An integrator with positive voltage on a noninverting input is shown in Figure. Sketch v o for 60 ms after S has been opened.
Using Bode plot calculate (a) Phase margin (b) Gain margin (c) Stability of closed loop system. The open transfer function of the system is t=30/(s+2)/(s+3)Using Bode plot calcula
Normalizing
Q. Ac measurements with constant voltage amplitude reveal that the total core loss of a certain magnetic circuit is 10 W at f = 50 Hz, and 13 Wat f = 60 Hz. Find the total core los
Q. What is the basic principle of oscillators? In an oscillating circuit, the amplitude of voltage or current oscillations decays with time owing to the dissipation of energy
Q. What is the Voltage controlled resistance region? In this region the JFET can actually be employed as a variable resistor whose resistance is controlled by the applied gate
How does the ITU make sure compatibility among the Radio systems used in dissimilar countries? Why is regulation so significant?
Q. Working of Microprocessor Control? The microprocessor, which has rapidly become a key component in digital control systems, and its associated circuits function as the digit
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