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A linearity improvement technique is proposed on the design of low frequency (132 KHz center frequency, 40 KHz band frequency) power-line communication band-pass filter, which focus on the linearity of large R-MOSFET. In order to enhance the linearity of the triode-mode MOSFET variable resistors, driving the controlling voltages of the R-MOSFET in a resistor tuning schematic instead of the main signal...
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