Which of the following is most difficult to fabricate in an IC? A. Diode B. Transistor C. FET D. Capacitor
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- A. Diode: A two-terminal semiconductor device that allows current to flow in one direction. - B. Transistor: A three-terminal semiconductor device that can amplify or switch electronic signals. - C. FET (Field-Effect Transistor): A type of transistor that uses Show more…
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Metal interconnect lines in IC circuits form parasitic MOS capacitors as illustrated in Fig. 5-37. Generally, one wants to prevent the underlying Si substrate from becoming inverted. Otherwise, parasitic transistors may be formed and create undesirable current paths between the N+ diffusions. Al interconnect (qψg = 4.1 eV) Insulating layer P-sub, Na = 10^15cm^-3 FIGURE 5-37 (a) Find Vfb of this parasitic MOS capacitor. (b) If the interconnect voltage can be as high as 5 V, what is the maximum capacitance (F/cm^2) of the insulating layer that can be tolerated without forming an inversion layer? (c) If the insulating layer thickness must be 1 μm for fabrication considerations, what should the dielectric constant K = ε/ε0 of the insulating material be to make Vt = 5 V? (d) Is the answer in (c) the minimum or maximum allowable K to prevent inversion? (e) At Vg = Vt + 2 V (Vt = 5 V), what is the area charge density (C/cm^2) in the inversion layer? (f) At Vg = Vt = 5 V, what is the high-frequency MOS capacitance (F/cm^2)? (g) At Vg = Vt + 2 V (Vt = 5 V), what voltage is dropped across the insulating layer?
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A one-sided $\mathrm{p}^{+} \mathrm{n}$ silicon diode has doping concentrations of $N_{a}=4 \times 10^{17} \mathrm{~cm}^{-3}$ and $N_{d}=8 \times 10^{15} \mathrm{~cm}^{-3}$. The diode cross-sectional area is $A=5 \times 10^{-4} \mathrm{~cm}^{2} .(a)$ The maximum diffusion capacitance is to be limited to $1 \mathrm{nF}$. Determine ( $i$ ) the maximum current through the diode, (ii) the maximum forward-bias voltage, and (iii) the diffusion resistance. ( $b$ ) Repeat part $(a)$ if the maximum diffusion capacitance is limited to $0.25 \mathrm{nF}$.
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