Present and future applications of switched-capacitor circuits

Nakayama, Kenji; Kuraishi, Y.

doi:10.1109/mcd.1987.6323153

Cited by 21 publications

(2 citation statements)

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“…The characteristics of an SC circuit are determined by the ratio of the capacitors used. The accuracy of an SC circuit is higher (0.1405%) (Nakayama and Yoshiaki 1987), than that of a conventional analogue circuit. The power dissipation and the total amount of hardware in an SC circuit system are less than in the digital system.…”

Section: Introductionmentioning

confidence: 91%

“…Such two-dimensional processing has used digital technology in conventional studies. In particular, the LSI technique for digital processing has made remarkable progress (Kobayashi et al 1987, Yamashina et al 1987, Nakayama and Yoshiaki 1987, Kenneth and Gabor 1988. This is due to the high accuracy of operations such as multiplication, the high signal-to-noise ratio and the good programmability.…”

Section: Introductionmentioning

confidence: 99%

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Switched-capacitor realization of two-dimensional discrete Fourier transform circuits

Abe

Matsumoto

Ogihara

et al. 1991

International Journal of Electronics

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All the spectral outputs of the proposed two-dimensional discrete Fourier transform circuit are obtained simultaneously in real time by using a switchedcapacitor circuit realization. This is achieved by making available all the trigonometric function circuits and by adopting a parallel input image method with m time functions in the row direction ( m means the number of samples in the column direction). The experimental results are shown as a basic raster of 8 x 8 points. Furthermore, circuit realizations for more practical applications are considered. It seems that the proposed system would be efective for image recognition or for the analysis of moving images.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Switched-capacitor realization of two-dimensional discrete Fourier transform circuits

Abe

Matsumoto

Ogihara

et al. 1991

International Journal of Electronics

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A multilevel data transmission baseband LSI using SC circuits

Nakayama

Ichihara

1990

Electron Comm Jpn Pt III

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The baseband circuit for multilevel data transmission system was implemented by LSI using SC circuit technology. The waveform‐shaping filter, the full‐wave rectifier for clock regeneration, the narrowband filter and other circuits were constructed by SC circuits. The size and the power dissipation were reduced by constructing all filters in time‐division multiplex. The chip area and the power dissipation in the SC circuit is proportional to the total capacitance, and the total capacitance is determined by the capacitance ratio and the unit capacitance. From such a viewpoint, the narrowband filter used in the clock regeneration is constructed by multirate, and the capacitance ratio was compressed using the N‐path filter. Capacitance partitioning is applied to high‐Q filters to suppress the capacitance ratio. Then by composing all capacitances as the integer multiples of the same unit capacitance, the desired ratio accuracy was achieved based on the unit capacitance of 0.1 pF. The problem of performance degradation due to integer capacitance ratio was minimized by the discrete approximation. When the N‐path filter is composed by the time‐division multiplex scheme, the performance may be degraded greatly due to the parasitic capacitance among wirings. This effect was analyzed and an improvement from the viewpoint of the layout was proposed. As a result, the multilevel data transmission baseband LSI was realized with the chip size of 4.3 × 4/2 mm2 and the power consumption of 35 mW.

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A 64‐points switched‐capacitor discrete fourier transform circuit for high‐speed inverse discrete fourier transform circuit

Ogihara

Yoneda

1990

Electron Comm Jpn Pt III

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The Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT) are used for solution of various problems in communications, signal processing and many fields of science. This paper proposes a new method to execute DFT which enables one to realize a high‐speed IDFT circuit with small circuit configuration. In this method, multiplying the DFT equation by the exponential term of the IDFT equation beforehand, IDFT processing is carried out only by addition without increasing the complexity of DFT processing. Using this method, a 64‐points DFT‐IDFT circuit is made on an experimental basis by the switched‐capacitor (SC) technique. In addition, the SC DFT‐IDFT circuit is applied to the recognition of Japanese vowels, and its validity is verified experimentally.

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Present and future applications of switched-capacitor circuits

Cited by 21 publications

References 0 publications

Switched-capacitor realization of two-dimensional discrete Fourier transform circuits

Switched-capacitor realization of two-dimensional discrete Fourier transform circuits

A multilevel data transmission baseband LSI using SC circuits

A 64‐points switched‐capacitor discrete fourier transform circuit for high‐speed inverse discrete fourier transform circuit

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