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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 highfrequency 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 mm 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.

Level-shifting Low-pass Filter Using DC-decoupled Capacitance Multiplication for Integrated Input Interface of Automotive MCUs