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1. If a signal plus noise is fed into a linear device, show that the noise figure of that device is given by F = (S/N)in(S/N)out (Hint: Start with the basic definition of noise figure that is given in this chapter.)
2. An antenna is pointed in a direction such that it has a noise temperature of 30 K. It is connected to a preamplifier that has a noise figure of 1.6 dB and an available gain of 30 dB over an effective bandwidth of 10 MHz.
(a) Find the effective input noise temperature for the preamplifier.
(b) Find the available noise power out of the preamplifier.
the charge entering the positive terminal of an element is q(t) = -12e-2t mC. and the power delivered to the element is p(t) = 2.4e-3t W . what is the current , voltage and energy of the element in the time interval 0
Explain and discuss the problems presented by electronic discovery in civil actions and how the law has responded.
compute the diameter in centimeters of a steel rod, an aluminum rod, and a copper rod, which can withstand a particular compression load.
The starter motor on a car draws 75-A starting current, which lowers the batery voltage from 12.6 to 9.1 V. What would be the battery voltage if it were being charged at 30 A.
Calculate the inductive reactance per meter of a single-phase, 50-Hz, two-wire transmission line. Assume each conductor's radius is 9cm and the distance between the two conductors is 5m.
A truncated cone has a height of 50cm. The circular faces on the top and bottom have radii of 20 mm and 1mm, respectively. If the material from which the solid cone is constructed has a conductivity sigma of 2 x 10^6 S/m.
Two p+-n abrupt junction diodes are made from silicon and are identical except that the donor levels in the 2 diodes are ND_1=10^15 and ND_2 = 1x10^17 cm-3.
An infinite sheet of uniform (constant) charge density (rho)s0 [C/m^2] is situated coincident with the x-y plane at z = 0. The sheet has a hole of radius a centered at the origin. Find the electric field vector at points along the z-axis.
A cylindrical wire of silicon has a radius of 1 mm and a length of8 cm. If a voltage of 5V is applied between the ends of the bar andμe = .11 m2/Vs, μh = .04m2/Vs, Ne = 1020electrons/m3 and Nh=Ne find the following
A three-phase overhead transmission line has a per-phase resistance of 0.15 ohm/km, and a per-phase inductance of 1.3263 mH/km.
In a test of a printed circuit board using a random test pattern, an array of 10 bits is equally likely to be 0 or 1. Assume the bits are independent. (a) What is the probability that all bits are 1s (b) What is the probability that all bits are 0s
How do resistors add in parallel versus in series? How do capacitors add in parallel versus in series? Are they different?
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