Open Access
Bessel Filter implementation in Log-Domain
TLDR
A log-domain 4 th order Bessel filter is proposed and analyzed and its performance in comparison with an AO-RC design is emphasized.Abstract:
In signal processing, mainly in audio domain, the need for a linear phase characteristic is sometimes more important than the frequency specifications concerning the pass band and stop bandwidth. For these applications, we need a Bessel approximation for the frequency characteristics. If the application is designed for portable devices low power and low voltage building blocks are also required. Log-Domain circuits may be very suitable. We propose and analyze in this paper a log-domain 4 th order Bessel filter and emphasize its performance in comparison with an AO-RC design.read more
Citations
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Journal ArticleDOI
A Bibliography of the Work Done on Externally-Linear- Internally-Nonlinear Circuits during 1979-2014
TL;DR: A bibliography of ELIN circuits which covers log-domain, exponential state-space domain, square root domain and other related circuits, based upon the work done during 1979 to 2014 is presented.
References
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Journal ArticleDOI
Log-domain filtering: an approach to current-mode filtering
TL;DR: A novel approach to filter design, based on Adams' ‘log-domain’ filters, is proposed that yields a truly current-mode circuit realisation and, by introducing an exponential map on the state-space description of the desired linear system, a log-domain filter can be fully realised.
Book
Analog and digital filter design
TL;DR: Introduction Time And Frequency Response Poles and Zeroes Analog Lowpass Filters Highpass Filtering Bandpass Filter Bandstop Filters Impedance Matching Networks Phase Shift Networks (All-Pass Filters)
Journal ArticleDOI
Effects of transistor nonidealities on high-order log-domain ladder filter frequency responses
TL;DR: In this article, the authors extended the nonideality studies on biquadratic log-domain filters to cover high-order filter deviations, which can be classically understood as integrator magnitude and phase errors, which also bear direct relationship to the component drifts and parasitic dissipations experienced by their passive ancestors.
Proceedings ArticleDOI
Effects of transistor nonidealities on log-domain filters
TL;DR: In this paper, the departure from ideal integration due to the major transistor nonidealities is studied, and practical filter deviation equations are derived, including parasitic emitter resistance, finite beta, base resistance and early effect.