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a. Draw the block diagram for a coherent receiver for QPSK using the same basis signals as in problems ("What frequency must be used for basis symbols f1 = sin(pi*ct) and f2 = cos(pi*ct) with a symbol period of 1/(9600Hz) to contain 6 cycles of the sin and cos"). What are the impulse responses for the 4 matched filters?
b. Modify your program from a so that it now receives data which is 2 bits per symbol. Choose frequency multiples for your symbols and plot some representative messages.
In a step-down converter, consider all components to be ideal. Let v_0 = V_0 be held constant at 5 V by controlling the switch duty ratio D. Calculate the minimum inductance L required to keep the converter operation
Describe the basic operation of the n-channel MOSFET, the relationship to VGS, VDS an IDS. This would include such things as accumulation, inversion, pinch-off point, etc. Which end is the drain
An op-amp is to be selected for an inverting amplifier to be used at dc and very low frequencies. A closed-loop nominal gain of -100 is desired. Specification indicate that the error due to finite open-loop gain cannot exceed 0.1dB.
Assume an aircraft carrier will be sunk with a probability of .3 if hit by a torpedo. At least how many torpedoes are required to hit the carrier so that it is sunk with a probability of .9
A 4 pole 50 kW dc machine has a value of Ea = 110 V at 1100 rpm. What is the induced voltage is the speed is increased 20%. Note: omega(w) = (2f*n)/60 where omega is in rad/sec, and n is in rpm
A 52-kg pole vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 0.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
A three resistors connected in series with a DC power supply of 12 volts with a return path to the negative terminal of the power supply also connected to ground. The first resistor is labeled "R1", which is equal to 220 Ohms.
A special external data signal (DATA_READY) is asserted whenever each of the bits for X are available. In addition, another special signal (ENCODE) is asserted during the transmission of the data X indicating whether 2X+3 or 3X+1 should be compute..
A 1 F capacitor is being charged through a 100 Ohm resistor. How long will it approximately take for the capacitor to reach about 63% of its final charge
To discharge a capacitor of 1mF charged with a voltage of 1 volt we connect it, at time t=0, with a resistor of R-ohm. When we measure the voltage in the resistor we find it to be v_R (t)=e^(-t) u(t). Determine the resistance R.
1. How much noise can be tolerated in a digital system using a 5 V power supply 2.What functions does an H-bridge perform in controlling a small DC motor 3.Explain how to calculate the duty cycle of a pulse in terms of frequency and width.
Design a multi-function unit with 4 functions chosen using select inputs s1s0. The unit has two 2-bit inputs (A = a1,a0 and B = b1,b0) and 4-bit output (z3,z2,z1,z0). The unit performs A+B (s1s0 = 00), AB (s1s0 = 01), A2+B (s1s0 = 10)
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