Abstract
a robust low-pass filter (LPF) with bandgap reference for automotive and industrial applications is proposed in this paper. Bandgap reference provides suitable bias current for LPF. The low-pass filter consists of transimpedance amplifier (TIA) and programmable gain amplifier (PGA). A three-stage fully differential amplifier is used in both TIA and PGA. Common-mode Level Controlling Block (CLCB) and Resistor Controlling Block (RCB) are designed to adjust the input common-mode level and gain of LPF, respectively. According to the post layout simulation results, maximum of LPF gain achieves 21.42dB on nominal corner, while the proposed LPF is robust enough to work and keep stable gain over different process corners and across a wide temperature range.
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