Analogue micropowered log-domain tone controllerfor auditory prostheses

Germanovix, Walter; O'Neill, George; Toumazou, C.; Drakakis, E.M.; Kitney, R.I.; Lande, Tor Sverre

doi:10.1049/el:19980780

Cited by 12 publications

(6 citation statements)

References 2 publications

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“…Based on the idea of Adams, Frey [2,3] further rewrote a set of nonlinear differential equations resulted from state-space as KCL nodal equations, yielding a novel class of circuits termed Exponential State Space (ESS) filters, moreover, Tsividis [4] had embedded it in as forming part of a broader branch of structures classified as Externally Linear Internally Nonlinear (ELIN) networks. Due to the characteristics of high-frequency operation, tuneability, and extended dynamic range under low power supply voltages, many researchers have devoted themselves to developing log-domain filters [5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Afterward, Drakakis et al [5][6][7] then proposed a systematic synthesis method based on "Bernoulli cell" to implement log-domain filters. Furthermore, Toumazou et al [8] and Germanovix et al [9] presented log-domain filters in terms of MOSFET circuits that operate in weak inversion, however, its operation is restricted only in kilo hertz range. Hence, in order to improve the problems of the above method, Eskiyerli et al [10] and Yu et al [11] adopted MOSFETs operated in saturation region to implement log domain filters, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Design of Square-Root Domain Filters

Huang

Liu

et al. 2005

Analog Integr Circ Sig Process

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In this paper, a square-root domain band-pass filter and biquad filter which are based on the MOSFET square law are proposed. Both of the square-root domain filters operated at 2.5 V supply voltage are constituted by current mirrors, current-mode square-root circuits and capacitors. The circuits presented have been simulated and fabricated using 0.25 µm CMOS process. Both of simulation and measured results which are in good agreement indicate that the center frequency f 0 is not only attainable at megahertz frequencies but also tunable electronically. The proposed circuits have the merits of high frequency operation, tuneability, low power supply voltage operation, low third order intermodulation distortion and low total harmonic distortion.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Square-Root Domain Filters

Huang

Liu

et al. 2005

Analog Integr Circ Sig Process

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“…To meet such demand and change, Toumazou et al [8] and Germanovix et al [9] pro- * Corresponding author. posed log-domain filters in terms of MOSFET circuits that operate in weak inversion.…”

Section: Introductionmentioning

confidence: 99%

Design of Current-Mode Square-Root Domain Band-Pass Filter with Reduced Voltage

Yu¹,

Huang²,

Chen³

et al. 2005

Analog Integr Circ Sig Process

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A design technique for current-mode square-root domain band-pass filter fabricated in a 0.25 µm CMOS process is presented. The basic building block consists of current-mode current mirrors, square-root circuits and capacitors, and in which the overall supply voltage is reduced by adopting low-voltage level-shift current mirror. Both of the simulation and measured results, which are in good agreement, indicate that the prototype of the bandpass provides tunable center frequency of 4-10 MHz with bias-current-tunable, −26.7 dB total harmonic distortion (THD), and approximately 1.598 mW power dissipation with a 1.5 V supply voltage. Advantages of the proposed filter include high frequency operation, tuneability, low supply voltage operation, low power consumption, and low third order intermodulation distortion.

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“…More recently, many papers have been devoted to the subject of CMOS log domain filters. Those which provide an experimental verification of their findings, however, are relatively few in number [13]- [19]. A comparison of the experimental results in previously published papers with respect to the filter performance attained in this work will be provided at the end of Chapter 4.…”

Section: -_mentioning

confidence: 74%

“…Although many papers have been devoted to the subject of log-domain filters in CMOS technology, very few provide experimental results. Experimentally measured filter specifications reported in the literature can be found in [13]- [19] and are summarized in Table 4.5. The results published by Python and…”

Section: -A Comparison Of Filter Performancementioning

confidence: 99%