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An L x L square transducer, submersed in water, is centered at the origin and is pointed down the +z-axis. A larger layer of homogeneous fat begins z=z0 and extends to the depth of penetration, so that the only possible returns are those of the interface between water and fat. The transducer is capapble of rotating towards the x-axis by θ degrees. Assume that ther is no attenuation in the water. Assume that the transmitted pulse is a gated sinusoid of duration T and height A0. a) Assume the z0 is in the far field and derive an expression for the strength to return as a function of angle. Make approximations where appropriate and do not forget the sidelobes. b) Assume that the transducer and preamplifier are able to detect signals 80 dB down from the transmitted pulse height. Assume also that a B-mode binary image is generated so that all signals above the detectable threshold are plotted in black and all signals below the threshold are plotted in white. Sketch the B-mode image that would result from this experiment.
What is the requirement for the phase response (transfer function) of each of these links to avoid distortion of the transmitted waveform?
A given device has been determined that it attenuates 4.8dB in power from its input terminal to its output terminal. What is the output power in watts if a 150-W input has been launched into a system that has two of this type of devices
A Common-Source amplifier utilizes a MOSFET with µnCox = 400µA/V2, W/L = 10, and VA = 10V. It is biased at ID = 0.2 mA and uses RD = 6 k-ohm. Find Rin, Avo and Ro. Also, if a load resistance of 10k-ohm is connected to the output
An office building of 20,000 ft2 would then take 40,000 watts of lighting at 2 watts /ft2. which amounted to 667 - 60 watt light bulbs or about the same two-bulb fluorescent fixtures. Resize the lighting system (W) assuming a lighting level.
A PWM is to be programmed to output a signal with a pulse high width of 150 usec and a pulse low width of 250 usec. What are the values required for prescale (if any) PWMPER and PWMDTY An 8-bit configuration is used and the E-clock is 24 MHz.
The resistance, inductance, and capacitance in a parallel RLC circuit are 2000 Ohms, 250 mH, and 10 nF, respectively. a) calculate the roots of the characteristic equation that describe the voltage response of the circuit.b) Will the response be over..
Give an example of an RC circuit whose transient behavior cannot be modeled by having a function generator with square wave output replacing the mechanical switch.
how to design boost converter and inverter parameters?
The stator resistance Rs is 0.25 Ω, and the stator as well as rotor leakage inductances are negligible. All losses except in the stator and rotor resistances can also be neglected. The reflected rotor resistance, Rr' is 0.3 Ω. The magnetizing curr..
Build a 1Gbps link as long as possible without regeneration. Assume a transmitter power of 1mW and a receiver sensitivity of -30dBm for a BER of 10^(-9). The dispersion at 1.5 micron is 20 ps/km.nm, and the attenuation is 0.25 dB/km.
The memory unit, 2M x 32, is specified by the number of words times the number of bits per word. How many address lines and input-output data lines are needed And give the number of bytes stored in the memory.
A circular loop of radius 2a lies in z=0 and carries current I in the counterclockwise directions. How do I show H= square of 2 * I divided by pi*a in the vector az directions
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