A 0.6-V Dynamic Biasing Filter With 89-dB Dynamic Range in 0.18-$mu$m CMOS
Akita, I.
Wada, K.
Tadokoro, Y.
Grad. Sch. of Electron. & Inf. Eng., Toyohashi Univ. of Technol., Toyohashi, Japan;
This paper appears in: Solid-State Circuits, IEEE Journal of
Publication Date: Oct. 2009
Volume: 44,
Issue: 10
On page(s): 2790-2799
ISSN: 0018-9200
INSPEC Accession Number: 10880528
Digital Object Identifier: 10.1109/JSSC.2009.2028049
Current Version Published: 2009-09-22
Abstract
This paper presents a 100-kHz fifth-order Chebychev low-pass filter (LPF) using the proposed dynamic biasing (DB) technique which enables wide dynamic range under a low-supply voltage. The change of state variables in the internal nodes of the filter can be corrected by using a novel simplified scheme, avoiding the output transient owing to dynamic biasing. The filter, including an automatic frequency tuning system based on the voltage-controlled-filter (VCF) architecture and voltage reference circuit, is fabricated in a 0.18-mum standard CMOS technology with a 0.5-V threshold voltage and consumes 443 muW from a power supply of 0.6 V. The output noise and the in-band IIP3 are 575 pArms and 219 muA, respectively. The filter achieves a dynamic range of 89 dB.
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