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A 0.6-V Dynamic Biasing Filter With 89-dB Dynamic Range in 0.18- \mu m CMOS

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3 Author(s)
Akita, I. ; Grad. Sch. of Electron. & Inf. Eng., Toyohashi Univ. of Technol., Toyohashi, Japan ; Wada, K. ; Tadokoro, Y.

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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Solid-State Circuits, IEEE Journal of  (Volume:44 ,  Issue: 10 )