Micropower log-domain filter for electronic cochlea

Toumazou, C.; Ngarmnil, J.; Lande, Tor Sverre

doi:10.1049/el:19941284

Cited by 120 publications

(56 citation statements)

References 6 publications

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“…Thus, in this case he chose a pulse-width-modulation scheme for the neural encoding as opposed to the pulse-frequencymodulation used in his 1993 effort. That same year the first current-mode cochleae designs arose; one from Christopher Abel (Abel et al, 1994) and one from Christofer Toumazou and Tor Sverre Lande (Toumazou et al 1994). The former effort presented a novel implementation of a silicon cochlea based on discrete-time, switch-current biquads.…”

Section: Increasing the Performance: 1993 -1998mentioning

confidence: 99%

Analogue CMOS Cochlea Systems: A Historic Retrospective

Katsiamis¹,

Drakakis²

2011

Biomimetic Based Applications

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Section: Increasing the Performance: 1993 -1998mentioning

confidence: 99%

Analogue CMOS Cochlea Systems: A Historic Retrospective

Katsiamis¹,

Drakakis²

2011

Biomimetic Based Applications

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“…Although not recognized then, this was actually the first time a first-order linear differential equation was implemented using translinear circuit techniques. In 1990, Seevinck introduced a "companding current-mode integrator" [5], and since then the principle of translinear filtering has been extensively studied by Frey, see, e.g., [6], Punzenberger and Enz [7], Toumazou and Lande [8], Perry and Roberts [9], and Mulder and Serdijn, see, e.g., [10], [11].…”

Section: Introductionmentioning

confidence: 99%

A wide-tunable translinear second-order oscillator

Serdijn

Mulder

Woerd

et al. 1998

IEEE J. Solid-State Circuits

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Abstract-This paper describes the design and measurement of a translinear second-order oscillator. The circuit is a direct implementation of a nonlinear second-order differential equation and follows from a recently developed synthesis method for dynamic translinear circuits. It comprises only two capacitors and a handful of bipolar transistors and can be instantaneously controlled over a very wide frequency range by only one control current, which indicates its suitability for spread-spectrum communications. Its total harmonic distortion can be made small by the design, which enables fully integrated transmitters. A semicustom test chip, fabricated in a standard 2-m, 7-GHz, bipolar IC process, operates from a single supply voltage, which can be as low as 2 V and oscillates over six decades of frequency with 031 dB total harmonic distortion.

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“…[12] in 1994. In this work, Toumazou described a second order low-pass filter which made use of MOSFETs operating in weak inversion, intended for use in a micropower biomedical application.…”

Section: -_mentioning

confidence: 99%

“…The vast majority of log-domain research in CMOS technology to this point has focused on the use of the MOS transistor operating in its subthreshold region [12]- [18], and therefore this research has been confined to low power and relatively low frequency implementations. Attempts have been made to extend the concepts of log-domain filters to CMOS circuits according to the square law relationship of a MOSFET transistor operating in saturation.…”

Section: -_mentioning

confidence: 99%