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A power amplifier for an AM transmitter operates at 28 volts at 2.15 amps. The input power is 0.78 watts. The efficiency of the amplifier must be at least 61%. What must the gain of the amplifier be, how much power is at the output, and how much power is dissipated?
When the variable resistor is adjusted to one extreme position the overall circuit voltage gain should be 3. When the variable resistor is adjusted to its other extreme position the overall circuit voltage gain should be 13.
Apple A5 die size is 122mm^2 when fabricated in 45nm technology. Assume they purchase 300mm wafers at a foundry for $ 2.5K /wafer. Assume a yield of 70%. What is Apple's approximate die cost?
Describe how to measure Rin of a amplifier in the lab at a signal frequency of 500kHz with only an oscilloscope as a test instrument. A DMM may not be used.
The battery is made by connecting 5 unit cells in series and then by connecting 7 of these series cells in parallel. Each unit cell has the voltage of 1.25 V and the internal resistance if 3.4 Ohm.
At 0°C the circuit is balanced and at this temperature the RTD has a resistance of 200 W. Determine the change in output voltage for a 1°C change in temperature now assuming the meter has an internal impedance of 8,000 W.
A temperature sensor produces 10 mV for each degree Fahrenheit. Determine the error in temperature reading if 20 mV of noise is added to the sensor output signal when the temperature is 70 degrees.
In actual electronic work, capacitances range from 30 picofarads, to 60 microfarads, to 5 farads. Assuming that each of these capacitances is charged to five volts, find for each a) the stored charge in coulombs, b) the number of electrons stored ..
Explain the difference between hard-decision and soft-decision decoding in partial response signaling, including the relative advantages and disadvantages of each.
A body attached to earth ground by an electrical conductor is at zero electrical potential. A charge of 25 C is added to the body. What is the potential of the body now. Explain.
A shunt dc motor has RA = 0.1-ohm and VT = 440 V. For an output power of 16.1 hp, nm = 1,213 rpm and IA = 103 A. The field current remains constant. Find the the rotational power loss in hp.
A particle having charge q and mass m, initially at rest, is accelerated through a potential difference V0. Find the final speed (assume nonrelativistic).
Activation of a switch at t = 0 in a certain caused the voltage across a 20-mH inductor to exhibit the voltage response V(t) =4e-0.2t mV ( for t ≥ 0) determine i(t) for t ≥ o given that the energy stored in the inductor at t = ∞ is 0.64 mJ.
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