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a) A silicon wafer is uniformly doped p-type with Na=10^15 cm-3. At T=0K. What are the equilibrium hole and electron consentrations?b) A semiconductor is doped with an impurity concentration N such that N>>ni and all the impurities are ionized. Also n-N and p=ni^2/N. Is the impurity a donor or acceptor? Explainc) The electron concentration in peace of Si at T=300K under equilibrium conditions is 10^5 cm-3. What is the hole concentration?d) For a silicon sample at T=300K, the Fermi level is located 0.259 eV above the intrinsic Fermi level. What are hole and electron concentrations?
An angle-modulated signal with carrier frequency ???ωc=2πx106 is described by the equation φEM(t) =10cos(ωct +0.1sin200πt) (a) find the power of the modulated signal. (b) find the frequency deviation Δf. (c) find the phase deviation ΔΦ.
What is the common-mode rejection ratio (in dB) if the output voltage is measured to be 2.0 Vp-p when the input terminals are connected together and a 0.1 Vp-p voltage is applied between the inputs and ground.
A spread-spectrum acquisition system uses a serial search scheme.The synchroniser integrates the squarer output for interval of 0.1s and the synchroniser output is sampled at intervals of 0.05s . The probability of false alarm is 0.064255 .
A circuit has a meter shunted by a parallel resistance (rs). With a current of 200 A. The meter can read a max of 1mA and has a residtance of 0.1 ohm. The shunt resistance is 0.0000005000025.
An FM signal being transmitted is represented by eFM(t) = 50Sin((2)(95.1)(106)t+2Sin((2)(10)(103)t)). If the antenna impedance is 75 , determine: (a) total power in FM signal and (b) FM modulation index.
A buffer amplifier with a gain of 1 V/V has an input resistance of 1M and an output resistance of 10 ohm. It is connected between a 1-V, 100-k ohm source and a 100-ohm load. What load voltage results and what are the corresponding voltage, current,..
A circuit is required in order to control a network of switches. The circuit has four inputs: three of the switches are normal on/off switches while the fourth switch is an enable switch for the entire circuit. The circuit should have the followin..
Find electric field everywhere produced by two concentrically oriented spheres of radii Ra and Rb (Rb > Ra ) whose volumes are uniformly and oppositely charged to the same amount of charge, Q0.
A 10 kW, 220 V, dc shunt motor has field and armature reistance of 110 ohms and .20 ohms, respectively. At no-load the motor runs at 1200 rpm and has an armature current of 5 A.
Toroidal coil of square cross section with N turns carrying current I. The inner radius is a, the outer radius is b. Height of the toroid is h. Solve for magnetic field density and magnetic flux everywhere in space. Find vector potential, A, of th..
A 50 cycle ac has a maximum instantaneous value of 42.42A.It crosses the zero axis in a positive direction when time is zero. Determine a)time when current first reaches a value 30a
compute the fourier transform of the descret time signal x[n] = {C, n1
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