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categoryهندسة كهربائية schoolبكالوريوس event_available2026-07-14

السؤال

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1. You are given the following information about a printed circuit board: 1/32-inch thick FR-4 fiberglass with a relative dielectric constant of 5.2; the board is covered with 1/2-oz copper plating; the trace width is 12 mils; the other side of the board is covered with a copper ground plane. (a) What is the DC resistance per length of trace in milli-ohms/inch? (b) What is the approximate resistance per length of trace in milli-ohms/inch at a frequency of 1GHz? (c) What is the capacitance per length of trace in pF/inch? (d) What is the characteristic impedance of the trace in ohms? (e) What is the velocity of a wave on the trace in meters/second? (f) What is the propagation delay TPD in ps/inch? (g) How long is one wavelength on the trace at a frequency of 1GHz?

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