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Q. Explain Inductorless Filters
Inductorless (Active) Filters
Filters (used to pass or eliminate certain frequency components of a signal) that are suitable for IC fabrication, but which do not contain inductors, are known as active filters. They have the op amp as a common component. Figure 5.4.13 shows the basic op-amp circuit with frequency-dependent impedances. The voltage gain or voltage transfer function of this circuit is given by
with Zi = Ri and Zf = Rf (1/j ωCf ) (i.e., Rf and Cf in parallel). We have a low-pass filter with
is sketched in Figure 5.4.14, from which one can see that at the half-power or 3-dB point of fl, the dc value Rf /Ri goes down by a factor of 1/ √ 2 or 0.707. With Zf = Rf and Zi = Ri + 1/j ωCi (i.e., Ri and Ci in series), we have a high-pass filter for which we obtain
NOR Gate NOR means NOT OR . it complements the output of an OR gate. The symbol of Nor gate in fig. (a) shows that a Nor gate comprises of an OR gate followed by a N
Q. Determine voltage and current gains for the CE BJT amplifier shown in Figure with the following parameters: R 1 = 30,000, R 2 = 9000 ,R C = 750 ,R E = 250 , R L = 1000
a dc generator has 300 turns in each field coil. the flux per pol is 0.1 wb. find the average value of EMF inducet in field winding in the flux decays to zero in 0.3 second?
Q. A transmission line with a dielectric (εr = 3.5) is 100 m long. At a frequency of 10 GHz, how many wavelengths long is the line?
Filters 1. You need to design a lowpass filter with cutoff frequency Fc= 1MHz. a. What is the minimum filter order required for 30 dB rejection (-30 dB gain) of 10 MHz? b. What is
Consider the following signals, sketch each one of them and comment on the periodic nature: (a) x(t) = A cos(2πf 0 t + θ), where A, f 0 , and θ are the amplitude, frequency, and
Q. Explain various functions of telephone switching systems. Ans: Functions of telephone switching systems are: (i) Attending: The system should be continually monito
does wein bridge can be used for frequency measurement? how it is possible?
Electrical network details: 1 single line diagrams with conductor sizes, transformer locations, consumer location, lengths, capacitors, and load, etc., 2
Partial derivatives - Transistor hybrid model: The partial derivatives are taken by keeping the collector voltage or base current constant as pointed out by the subscript atta
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