A 1-V 7th-Order SC Low-Pass Filter for 77-GHz Automotive Radar in 28-nm FD-SOI CMOS

Open AccessArticle A 1-V 7th-Order SC Low-Pass Filter for 77-GHz Automotive Radar in 28-nm FD-SOI CMOS by Alessandro Parisi 1,Giuseppe Papotto 1,Egidio Ragonese 2,*OrcID andGiuseppe Palmisano 2 1 STMicroelectronics, 95121 Catania, Italy 2 Dipartimento di Ingegneria Elettrica Elettronica e Informatica (DIEEI), University of Catania, 95125 Catania, Italy * Author to whom correspondence should be addressed. Academic Editor: Paulo de Souza Electronics 2021, 10(12), 1466; https://doi.org/10.3390/electronics10121466 Received: 20 May 2021 / Revised: 12 June 2021 / Accepted: 16 June 2021 / Published: 18 June 2021 (This article belongs to the Special Issue RF/Mm-Wave Circuits Design and Applications) Download PDF Browse Figures Citation Export Abstract This paper presents a switched capacitor low-pass filter in a 28-nm fully depleted silicon on insulator CMOS technology for 77-GHz automotive radar applications. It is operated at a power supply as low as 1 V and guarantees 5-dB in-band voltage gain while providing out-of-band attenuation higher than 36 dB and a programmable passband up to 30 MHz. A double sampling technique is adopted, which allows high operating frequency to be achieved while saving power. Moreover, low-voltage biasing and common-mode feedback circuits are exploited to guarantee an almost rail-to-rail output voltage swing. The proposed filter provides an output 1-dB compression point as high as 8.7 dBm with a power consumption of 9 mW. To the authors’ knowledge, this is the first SC-based implementation of a low pass filter for automotive radar applications.