Title :
Area-efficient RC low pass filter using T-networked resistors and capacitance multiplier
Author :
Changho Seok ; Kyomuk Lim ; Jindeok Seo ; Hyeunho Kim ; Seunghyun Im ; Ji-hoon Kim ; Choul-Young Kim ; Hyoungho Ko
Author_Institution :
Dept. of Electron., Chungnam Nat. Univ., Daejeon, South Korea
Abstract :
A low pass filters (LPFs) are important building blocks for many analog integrated circuit design. The biomedical applications or the sensor applications require the LPFs with very low cut-off frequency. The simplest way to implement the LPF is using the passive RC filter. The passive RC LPF, however, consumes large chip area when the desired time constant is large. The transconductance-C (gm-C) filter or the switched capacitor (SC) filters are widely used to achieve the low cut-off frequency in limited area. However, non-linearity and switching noise are major drawbacks of the gm-C filters and the SC filters. This paper presents an area-efficient LPF using T-networked resistors and current-mode capacitance multiplier. The area of the proposed LPF is reduced to 8.31 % of the conventional passive RC LPF at the same cut-off frequency of 7.1 kHz. The proposed LPF is designed using standard 0.18 μm CMOS process with the option process of high-resistivity polysilicon resistor and metal-insulator-metal capacitor.
Keywords :
CMOS integrated circuits; RC circuits; analogue multipliers; circuit noise; low-pass filters; passive filters; resistors; switched capacitor filters; CMOS process; T-networked resistors; analog integrated circuit design; area-efficient RC low pass filter; biomedical applications; current-mode capacitance multiplier; frequency 7.1 kHz; high-resistivity polysilicon resistor; large chip area; low cut-off frequency; metal-insulator-metal capacitor; nonlinearity; passive RC filter; sensor applications; size 0.18 mum; switched capacitor filters; switching noise; transconductance-C filter; Immune system; Resistors; Switches; T-networked resistors; anti-aliasing filter; area-efficient low pass filter; current-mode capacitance multiplier;
Conference_Titel :
Control, Automation and Systems (ICCAS), 2013 13th International Conference on
Conference_Location :
Gwangju
Print_ISBN :
978-89-93215-05-2
DOI :
10.1109/ICCAS.2013.6704155