Ultra low power switched current finite impulse response filter banks realized in CMOS 0.18 um technology

Rafał Długosz

doi:10.1117/12.721162

10 May 2007 Ultra low power switched current finite impulse response filter banks realized in CMOS 0.18 &mgr;m technology

Rafał Długosz

Author Affiliations +

Proceedings Volume 6590, VLSI Circuits and Systems III; 65900H (2007) https://doi.org/10.1117/12.721162
Event: Microtechnologies for the New Millennium, 2007, Maspalomas, Gran Canaria, Spain

Abstract

Ultra low power circuits are in high demand in many applications especially in wireless sensor networks (WSN), where energy is scavenged from environment. WSN systems contain different blocks, such as: sensors, filters, analog-to-digital converters, very often a simple processor and the RF front end block. This paper concerns ultra low power finite impulse response (FIR) filters and filter banks implemented in a switched current (SI) technique. In this paper new SI FIR filter structures and filter banks have been proposed. These circuits operate in the current mode and do not use operational amplifiers, what enables very low power dissipation on the level of several μW. Proposed filters incorporate transistors working under threshold level for the voltage supply that is in the range 0.5 - 0.7 V. The simulated attenuation in the stopband of the frequency response is limited to about 45 dB, what is due to different nonidealities, but such value is usually sufficient in WSN applications. The SI technique features many interesting mechanisms that simplify realization of analog filter banks. The signal samples that are stored in the delay lane are in SI filters copied to the filter coefficients using current mirrors. As a result, there exists the possibility to connect many sets of filter coefficients to a single delay line without the speed limitation. Ultra low power operation of proposed filters is also possible due to a special structure of the clock generator that only consists from switches and NOT gates.

Citation Download Citation

Rafał Długosz "Ultra low power switched current finite impulse response filter banks realized in CMOS 0.18 &mgr;m technology", Proc. SPIE 6590, VLSI Circuits and Systems III, 65900H (10 May 2007); https://doi.org/10.1117/12.721162

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available