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Title [LETTER] Level-shifting Low-pass Filter Using DC-decoupled Capacitance Multiplication for Integrated Input Interface of Automotive MCUs
Authors (Hyunjong Kim) ; (Yujin Park) ; (Su Hwan Kim) ; (Hyunjoong Lee)
DOI https://doi.org/10.5573/JSTS.2020.20.5.463
Page pp.463-468
ISSN 1598-1657
Keywords Level shifter; low-pass filter; automotive; microcontroller; input interface; analog front-end
Abstract A level-shifting low-pass filter is presented for integrated input interface of automotive microcontrollers. The level-shifting low-pass filter captures battery-level inputs and attenuates high-frequency noise. By using DC-decoupled capacitance multiplication, our level-shifting low-pass filter withstands large voltage spikes and improves a cut-off frequency from 3 MHz to 10.5 kHz regardless of the sensor output DCs, thus eliminating the expensive external components. The level-shifting low-pass filter occupies 0.016 mm2 per channel, which is only 0.45% of the size of the input interface. The input interface achieves 60.7 dB signal-to-noise-plus-distortion ratio. A prototype is fabricated in 0.18 μm BCDMOS technology.