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Time domain processing techniques using ring oscillator-based filter structures
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Title: | Time domain processing techniques using ring oscillator-based filter structures |
Authors: | Leene, L Constandinou, TG |
Item Type: | Journal Article |
Abstract: | The ability to process time-encoded signals with high fidelity is becoming increasingly important for the time domain (TD) circuit techniques that are used at the advanced nanometer technology nodes. This paper proposes a compact oscillator-based subsystem that performs precise filtering of asynchronous pulse-width modulation encoded signals and makes extensive use of digital logic, enabling low-voltage operation. First- and second-order primitives are introduced that can be used as TD memory or to enable analogue filtering of TD signals. These structures can be modeled precisely to realize more advanced linear or nonlinear functionality using an ensemble of units. This paper presents the measured results of a prototype fabricated using a 65-nm CMOS technology to realize a fourth- order low-pass Butterworth filter. The system utilizes a 0.5-V supply voltage with asynchronous digital control for closed-loop operation to achieve a 73-nW power budget. The implemented filter achieves a maximum signal to noise and distortion ratio of 53 dB with a narrow 5-kHz bandwidth resulting in an figure- of-merit of 8.2 fJ/pole. With this circuit occupying a compact 0.004-mm2 silicon footprint, this technique promises a substantial reduction in size over conventional Gm-C filters, whilst addition- ally offering direct integration with digital systems. |
Issue Date: | 1-Dec-2017 |
Date of Acceptance: | 9-Jun-2017 |
URI: | http://hdl.handle.net/10044/1/50090 |
DOI: | 10.1109/TCSI.2017.2715885 |
ISSN: | 1549-8328 |
Publisher: | Institute of Electrical and Electronics Engineers |
Start Page: | 3003 |
End Page: | 3012 |
Journal / Book Title: | IEEE Transactions on Circuits and Systems Part 1: Regular Papers |
Volume: | 64 |
Issue: | 12 |
Copyright Statement: | © 2017 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information. |
Sponsor/Funder: | Engineering & Physical Science Research Council (EPSRC) Engineering & Physical Science Research Council (EPSRC) |
Funder's Grant Number: | EP/M020975/1 EP/K015060/1 |
Keywords: | Science & Technology Technology Engineering, Electrical & Electronic Engineering Filtering VCO time-domain asynchronous logic low noise delta-sigma low voltage mixed signal CMOS AMPLIFIERS ANALOG ADC Electrical & Electronic Engineering 0906 Electrical and Electronic Engineering |
Publication Status: | Published |
Open Access location: | http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7971944 |
Online Publication Date: | 2017-07-07 |
Appears in Collections: | Electrical and Electronic Engineering Faculty of Engineering |