61. Consider a silicon sample at T = 300 K, with a uniform donor density Nd = 5 × 1016 cm-3 illuminated uniformly such that the optical generation rate is Gopt = 1.5 × 1020 cm-3 s-1 throughout the sample. The incident radiation is turned off at t = 0. Assume low-level injection to be valid and ignore surface effects. The carrier lifetimes are τp0 = 0.1 µs and τn0 = 0.5 µs.
The hole concentration at t = 0 and the hole concentration at t = 0.3 µs, respectively, are
The hole concentration at t = 0 and the hole concentration at t = 0.3 µs, respectively, are
62. Which of the following is not associated with a pn junction diode?
63. In an integrated circuit, the SiO2 layer provides
64. The CMOS inverter can be used as an amplifier when:
65. GaAs has bandgap energy of 1.42 eV. The material would produce photon output at a wavelength of (Planck's constant = 6.625 × 10-34 J - s, q = 1.6 × 10-19 C )
66. A Schottky diode clamp is used along with a switching BJT for
67. For every 10°C temperature increase the reverse saturation current in a p-n junction diode:
68. Assuming the Fermi level EF to be independent of temperature, EF may be defined as the level with an occupancy probability of
69. What is the most noticeable effect of a small increase in temperature in the common emitter connected BJT?
70. Consider the following statements:
1. The radiation falling on a photodiode is primarily a minority carrier injector.
2. The short-circuit current of a reverse biased photodiode under illumination varies exponentially with light intensity.
3. The photo voltage emf of an open-circuited photodiode varies logarithmically with the light generated short-circuit current.
4. The spectral response of a photodiode does not depend upon the frequency of the incident light.
Which of these statements are correct?
1. The radiation falling on a photodiode is primarily a minority carrier injector.
2. The short-circuit current of a reverse biased photodiode under illumination varies exponentially with light intensity.
3. The photo voltage emf of an open-circuited photodiode varies logarithmically with the light generated short-circuit current.
4. The spectral response of a photodiode does not depend upon the frequency of the incident light.
Which of these statements are correct?
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