Adaptive impedance matching network with digital capacitor in narrowband power line communication

Power Line Communication is increasingly getting common in various applications. However, the noise level and impedance mismatch are still the main concern of the technology. Although the noise level and the impedance mismatch of the systems can be controlled using a bandpass filter and an impedance matching circuit, respectively, the variables in the power line are not static and it is rather difficult to design a circuit that allows maximum power transfer in the system all the time. In this paper, a new adaptive impedance matching circuit is proposed for narrowband power line communication. A new model using a digital capacitor and a digital resistor are derived that based on the Band Pass RLC impedance matching network.