in meters – Japanese Translation – Keybot Dictionary

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where l is the trace length in meters, S is the trace area in square meters, and ρ (the resistivity of copper) is 1.7x10-8Ω - m at 20°C, or 2.1 x 10-8Ω - m at 70°C. As an example, the resistance of a copper trace 0.5cm wide and 35µm thick at 20°C is 1mΩ/cm.
For example, consider a synchronous step-down controller for notebook computers (Figure 1). The MOSFETs are driven by the transference of energy from the tank capacitors (C6 and C7) to the gates through the few ohms of the driver outputs. Note that the gate drive for the high-side n-channel MOSFET (Q1) is floating. The n-channel driver works like a charge pump!