Assignment GaAs Oscillator 1. What is the threshold potential across one nano-metre?

Assignment GaAs Oscillator 1. What is the threshold potential across one nano-metre? (Hint: see Lab-Volt handout) 2. In Fig. 3-2 (Lab-Volt handout), indicate various energy bands (Hint: See Fig. In Streetman), and draw the corresponding E-k diagram 3. Using the values given in Lab-Volt handout, draw a parallel resonant circuit and give lumped element values for R, Land for generator oscillation frequency of 10 GHz 4. Resonant frequency of an air-filled cavity made with rectangular waveguide WR-90 for the fundamental TE10 mode is given by the equation given below. Calculate length of the resonant cavity: 10 = 2 ad /{a? + d? 30.5 where, a, b and d are the internal width, height and length of the waveguide To is the resonant wavelength C, speed of light is 2.997925 x 108 m/s f = 10 GHz 5. Calculate resonant frequency fo of the cavity, if all dimensions of the cavity change -10% and 10%. Is change in the resonant frequency symmetrical about fo ? C = foro fo > ان 5 Si GaAs 4 Upper valley 3 ΔΕ = 0. 3. T Energy (eV) Eg Lower valley Eg +++++ -1 -2 -3 L [111] X [100] X L [111] 5 [100] Wave vector

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