A simplified guide to using the MCS51 on-chip UART

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Chip-on-board (COB) is an assembly technology for semiconductors in which the electronic chip is directly mounted on and connected to its final board instead of undergoing the traditional packaging process for integrated circuits. This process reduces space requirements and cost, and also increases the performance of the system due to the decrease in connection lengths and increase in reliability. This approach is normally used for wire-wound antennas. During the COB process, the capacitor used to create resonance is also packaged in the device.

9 Electric field produced by a short dipole. 13) The short dipole, however, does not radiate effectively because it has a very small radiation resistance, normally below 1 Ω, making it unsuitable for a good impedance match. Therefore, other dipole alternatives are preferred when possible, such as the half-wave dipole. 10, receives its name because its length equals half of the wavelength of the current signal traveling through the antenna. 10 Electric field produced by a half-wave dipole. 14) One of the main advantages of the half-wave dipole is that its radiation resistance, around 73€Ω, is much larger than the radiation resistance of the short dipole.

R: Ohmic losses in the antenna. 15) where ω = 2πf. The resonant frequency for the parallel circuit is the frequency that creates the maximum for Z(jω). 15), it can be seen that at the resonant frequency, the impedance of the parallel circuit is real and equal to the value of the resistance of the load. This is the maximum value for the impedance. 1 (10 μH). 56 MHz for HF systems. 7 pF The same calculations for resonant frequency can be applied to the devices that communicate data by tuning and detuning the antenna.

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