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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.
Consider a 6 cm2 dye sensitised solar cell with reverse saturation current Jr=10-10A/cm2. When the solar irradiance is 1,000 W/m2, it produces an equivalent photo current/short circuit current of 15 mA/cm2 at 300 K.
Indicate the closest value to the change in decibels of the received signal for the given parameter change. The distance between transmitter and receiver for a one-way communication path is halved.
A certain power transistor is packaged in a TO-220 case having a thermal resistance, RJC = 3°C/W. The device will be mounted using a mica insulator and silicone grease (RCS = 1°C/W) onto a heat sink having RSA = 6°C/W.
Compute the complex conjugate of each of the follwoing expressions: (a) -1; (b) -j/5
Consider a VLSI chip with 100,000 gates and 2000 flip flops. A combinational ATPG program produces 500 vectors to fully test thelogic. Find the minimum number of scan test cycles if 20 scanchains are implemented.
An optimizing compiler has been developing for the bad store machine with a measurement shown below. The compiler discard 50% ofthe ALU instruction although it cannot reduce, store branches,close, load, compute for the unoptimized CPI.
Which grating would be easier to fabricate?
Consider the parallel inductors shown in Figure P3.61, with mutual coupling and the dots at the top ends of L1 and L2. Derive an expression for the equivalent inductance seen by the source in terms of L1, L2, and M.
1. What is the effect of increasing the quantization levels on the quantization error in a PCM signal 2. How can we increase the data rate in a digital signal
An Emitter follower with a BJT biased at Ic = 1mA and having β = 100 is connected between a source with Rsig = 20kg and a load RL = 1kg. a) find Rin, vb/vsig, and v0/vsig. b) If the signal amplitude across the base-emitter junction is to be limitd t..
For the numerical auto- and cross-correlation matrices of Example 8.11, find explicit expressions (write out an equation for each weight) for the steepest-descent tap weight adjustment algorithm (8.242). Let μ= 0:01. Justify this as an appropriate..
If ϑ = 30° and ϑ = 65°, what fraction of the original laser power passes through the analyser?
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