Log-domain SIMO and MISO low-voltage universal biquads

Psychalinos, Costas

doi:10.1007/s10470-010-9564-7

Cited by 12 publications

(6 citation statements)

References 28 publications

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“…The topology of a current‐mode lossless integrator based on the concept of log‐domain filtering is demonstrated in Figure a . The input–output relationship that describes the operation of the nonlinear transconductor cells denoted as E+ and E− is

{italici}_{italicOUT} = {italicI}_{italicBIAS} \cdot {italice}^{\frac{({\overset{υ}{true}}_{IN +} - {\overset{υ}{true}}_{IN -})}{italicn V_{T}}}

and the E− cell provides an output current with a direction opposite that of the E+ cell.…”

Section: Fractional‐order Companding Filtersmentioning

confidence: 99%

“…All the aforementioned characteristics make the companding filters compatible with the modern trend for realizing resistorless low‐voltage tunable filters. With the added demand for analog ultra‐low‐power systems, log‐domain and sinh‐domain filters are two subcategories of companding filters that could be realized using MOS transistors biased in the weak inversion, and therefore, they could fulfill the aforementioned requirement .…”

Section: Introductionmentioning

confidence: 99%

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0.5‐V fractional‐order companding filters

Τσιριμώκου

Laoudias

Psychalinos

2014

Circuit Theory & Apps

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Summary Novel configurations of fractional‐order filter topologies, realized through the employment of the concept of companding filtering, are introduced in this paper. As a first step, the design procedure is presented in a systematic algorithmic way, while in the next step, the basic building blocks of sinh‐domain and log‐domain integrators are presented. Because of the employment of metal–oxide–semiconductor (MOS) transistors operated in the subthreshold region, the derived filter structures offer the capability for operation in an ultra‐low‐voltage environment. In addition, because of the offered resistorless realizations, the proposed topologies are reconfigurable, in the sense that the order of the filter could be chosen through appropriate bias current sources. The performance of the derived fractional‐order filters has been evaluated through simulation and comparison results using the Analog Design Environment of the Cadence software and MOS transistor parameters provided by the Taiwan Semiconductor Manufacturing Company (TSMC) 180‐nm complementary MOS (CMOS) process. Copyright © 2014 John Wiley & Sons, Ltd.

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{italici}_{italicOUT} = {italicI}_{italicBIAS} \cdot {italice}^{\frac{({\overset{υ}{true}}_{IN +} - {\overset{υ}{true}}_{IN -})}{italicn V_{T}}}

and the E− cell provides an output current with a direction opposite that of the E+ cell.…”

Section: Fractional‐order Companding Filtersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

0.5‐V fractional‐order companding filters

Τσιριμώκου

Laoudias

Psychalinos

2014

Circuit Theory & Apps

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“…In (1)-(2) and DC are a dc current and a dc voltage, respectively; is the thermal voltage, and is the subthreshold slope factor of an MOS transistor. Variables with a circumflex represent compressed voltages [5][6][7][8].…”

Section: Log-domain 4th-order Bandpass Filtermentioning

confidence: 99%

“…ISRN Biomedical Engineering The topology of a Log-Domain two-input lossy integrator is depicted in Figure 5. Performing a similar analysis the expressions in (7) and (8) are obtained:…”

Section: Log-domain 4th-order Bandpass Filtermentioning

confidence: 99%

“…The last approach offers potential for reducing the power consumption and this is very important in biomedical applications, since such devices should have a long battery life. Taking also the low-frequency range of biological signals into account, the employment of MOS transistors in the subthreshold region offers the benefit for realizing Log-Domain filters with small capacitor area, due to the large values of the realized equivalent resistors [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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0.5 V Cardiac Sense Amplifier Realization Using Log-Domain Filtering

Giagkoulovits

Psychalinos

2013

ISRN Biomedical Engineering

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A novel configuration of a cardiac sense amplifier for pacemakers, realized using the concept of Log-Domain filtering, is introduced in this paper. The analog part of the amplifier operates under a single 0.5 V power supply voltage. Compared to the corresponding already published configuration, the proposed scheme offers the benefits of reduced operating voltage and dc power dissipation. The performance of the intermediate stages, as well as of the whole system, has been evaluated through the utilization of the Analog Design Environment of the Cadence software and, also, the design kit provided by the AMS 0.35 μm CMOS process.

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