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• The power amplifier of a portable cellular handset operates at 3.2 volts and has an output power of 600 mW. Find the amplifier output impedance.
• The amplifier is connected to the handset antenna which has an impedance of 35 + j10 ? at one unspecified operating frequency. Find the inductive reactance and capacitive reactance needed to match the transmitter output to the antenna under this condition. (Hint: you can use the amplifier output impedance as Z0. Use the method of Pozar example 2.5 or any other means to find the matchingnetwork).
• If the handset is operating at 1800 MHz, find the capacitance and inductance of the matching network.
• To put these impedances into perspective, research how one can calculate the impedance of a straight piece of wire or printed circuit board (PCB) conductor in terms of length, thickness and width. Find the length of the conductor on a PCB that would provide the desired impedance. Note: it is common to specify PCB material by weight. A "1 ounce copper" circuit board has a thickness of copper that weighs one ounce per square foot. Circuit trace width can vary widely, but you may assume a 25 mil trace width.
The purpose of this project is to design a device that would remotely control (from a Bluetooth-enabled mobile phone for instance) at least two actuators (e.g. relays and switches).
Rain affects the downlink from the satellite and the overall CNR ratio in the receiver falls by 6.0 dB to 13.0 dB. What is the bit error rate and the time between errors now?
Question about Complex power, If an electrical load operates at 240 Vrms.The load absorbs an average power of 8kW with .8 lagging power factor
Water is the working fluid in a vapor power cycle with reheat, superheat and reheat. Superheated steam enters the first turbine stage at 8 MPa, 480 C and expands to 0.7 MPa
The op-amp circuit measures the changes of temperature in a system. The output voltage is given by v0(t) = -R(t)vi(t). Suppose that the temperature in the system changes cyclically after t = 0, so that R(t) = [1 +0.5 cos(20πt)] u(t) and let the in..
A very long cylinder of radius 2.00 cm carries a uniform charge density of 1.50 nC/m. Taking the reference level for the zero of potential to be the surface of the cylinder, find the radius of equipotential surfaces having potentials of 10.0V, 20...
Calculate the critical clearing angle and plot the swing curve for the machine - What is the power angle at the end of the 10 cycles?
The temperature of steam at the inlets of both turbines is 500°C, and the enthalpy of steam is 3185 kJ/kg at the exit of the high-pressure turbine, and 2247 kJ/kg at the exit of the low-pressure turbine. Disregarding the pump work, determine the w..
Is there any advantage of star connection over delta w.r.t. induction motors? Also, is there any advantage or disadvantage of star connection over delta w.r.t. distribution and transmission of power? Please explain the reasons for all the advantag..
An OpAMP has a unity gain frequency (ft) of 10MHz and a slew rate of 10V/us and AVoc = 120dB at DC (f=0). Assume VCC = -VEE = 15 Volts.a. Approximate the cutoff frequency of the OPAMP itself. b.
Estimate the diffusivity of a spherically shaped protein with a MW of 36,000 in water at 37oC.
Absorption loss of metal shielding, A plane metal shield offers an absorption loss of 30 dB at a frequency of 10 kHz to normally incident radiated emission.
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