Open Access0.013 mm 2 , kHz‐to‐GHz‐bandwidth, third‐order all‐pole lowpass filter with 0.52‐to‐1.11 pW/pole/Hz efficiency
Author(s) -
Chen Yong,
Mak PuiIn,
Zhang Li,
Qian He,
Wang Yan
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2013.2670
Subject(s) - bandwidth (computing) , cutoff frequency , low pass filter , cmos , capacitor , band pass filter , inductor , filter (signal processing) , physics , materials science , electrical engineering , optoelectronics , optics , engineering , telecommunications , voltage
A third‐order all‐pole analogue lowpass filter (LPF) with kHz‐to‐GHz bandwidth tunability is proposed. It embeds a current‐reuse active inductor into a current‐scalable source follower to realise three concurrently tunable poles in a single branch. The LPF fabricated in 0.18 μm CMOS measures a tunable − 3 dB cutoff from 0.8 kHz to 1.2 GHz, under a scalable power of 1.25 nW to 4.01 mW. Owing to no tuning capacitor, the die area is extremely compact (0.013 mm 2 ) and the achieved filter efficiency is 0.52 to 1.11 pW/pole/Hz.