A transistor-only circuit model of the autozeroing floating-gate amplifier

Hasler, P.; Kucic, M.; Minch, B.A.

doi:10.1109/mwscas.1999.867232

Cited by 24 publications

(18 citation statements)

References 1 publication

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“…This continuous-time filter allows both the low-frequency and high-frequency cutoffs to be controlled electronically by changing the appropriate bias currents. We have derived analytical models that are in good agreement with experimental data to completely characterize the amplifier [2] and have simulated these circuits using Cadence [3]. We present experimental measurements that were taken using 3.0-V power supplies in this section.…”

Section: A Differential Continuous-time Bandpass Amplifiermentioning

confidence: 86%

“…The multiple bandpass filters produce a frequency decomposition of the incoming signal into multiple bands. We use a transistor-only circuit model of the autozeroing floating-gate amplifier (AFGA) [7], which we will refer to as the capacitively coupled current conveyer (C ) [2], to achieve a broadly tuned bandpass response. By adding feedback between the stages, we sharpen the filter rolloff response if desired.…”

Section: Introductionmentioning

confidence: 99%

“…Section II describes the circuits for the continuous-time bandpass filters. These circuits are a transistor-only circuit model of the AFGA termed C that we initially described elsewhere [2]. Section III describes the floating-gate circuits for the weighting multipliers.…”

Section: Introductionmentioning

confidence: 99%

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A programmable continuous-time floating-gate Fourier processor

Kucic

Low

Hasler

et al. 2001

IEEE Trans. Circuits Syst. II

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We present a programmable continuous-time floating-gate Fourier processor that decomposes the incoming signal into frequency bands by analog bandpass filters, multiplies each channel by a nonvolitile weight, and then recombines the frequency channels. A digital signal processor would take a similar approach of computing a fast Fourier transform (FFT), multiplying the frequency components by a weight and then computing an inverse FFT. We decompose the frequency bands of the incoming signal using the transistor-only version of the autozeroing floating-gate amplifier (AFGA), also termed the capacitively coupled current conveyer (C 4 ). Each band decomposition is then fed through a floating-gate multiplier to perform the band weighting. Finally, the multiplier outputs are summed using Kirchoff current law to give a band-weighted output of the original signal. We examine many options to reduce second-order harmonic problems inherent in the single-sided C 4 . We present a method for programming arrays of floating-gate devices that are used in the weighting of the bands. All of these pieces fit together to form an elegant and systematic Fourier processor.

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Section: A Differential Continuous-time Bandpass Amplifiermentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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A programmable continuous-time floating-gate Fourier processor

Kucic

Low

Hasler

et al. 2001

IEEE Trans. Circuits Syst. II

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“…Their design was based on the DIFF2 structure discussed by Lyon in 1992 and on the autozeroing second-order section presented by the authors in (Hasler et al, ). The basic building block of their design is a capacitively-coupled current-conveyor (C 4 ) presented in (Hasler et al, 1999). In this paper, they presented only measured frequency response results from a 32-section C 4 BP filterbank, whereas a thorough analysis and characterization of the C 4 structure was presented five years later (Graham et al, 2007).…”

Section: -2004mentioning

confidence: 99%

Analogue CMOS Cochlea Systems: A Historic Retrospective

Katsiamis¹,

Drakakis²

2011

Biomimetic Based Applications

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“…8(a). The C 4 SOS is composed of three C 4 s (described in [19]) in which the feedback capacitor of the first stage filter is removed in order to make that stage a high gain amplifier. This filter can have a frequency response of any defined bandwidth, and outside that bandwidth, slopes of ±40 dB/decade or greater occur.…”

Section: Frequency Decompositionmentioning

confidence: 99%