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IEE Proceedings - Circuits, Devices and Systems

Issue 1 • Date Feb 2000

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Displaying Results 1 - 11 of 11
  • Mixed-mode automatic tuning scheme for high-Q continuous-time filters

    Publication Year: 2000, Page(s):57 - 64
    Cited by:  Papers (6)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (672 KB)

    An automatic tuning scheme using envelope detectors and simple mixed-mode circuitry is discussed. The method is developed especially for filters with large Q values and can be used at very high operating frequencies. The circuit was designed in a 1.2 μm CMOS process with a 3 V single supply voltage. As a demonstration filter, a second-order g m-C bandpass section is used, but the met... View full abstract»

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  • High-frequency two-input CMOS OTA for continuous-time filter applications

    Publication Year: 2000, Page(s):13 - 18
    Cited by:  Papers (11)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (412 KB)

    A high-frequency fully differential CMOS operational transconductance amplifier (OTA) is presented for continuous-time filter applications in the megahertz range. The proposed design technique combines a linear cross-coupled quad input stage with an enhanced folded-cascode circuit to increase the output resistance of the amplifier. SPICE simulations show that DC-gain enhancement can be obtained wi... View full abstract»

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  • Performance comparison of high-order IFLF and cascade analogue integrated lowpass filters

    Publication Year: 2000, Page(s):19 - 27
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (740 KB)

    The magnitude and delay performance of integrated continuous-time gm-C lowpass filters is discussed. The analysis is based on tenth-order filters with equiripple group delay, implemented in CMOS fully differential form as inverse-follow-the-leader feedback (IFLF) and cascade topologies. A very-high-frequency operational transconductance amplifier (OTA) is used as the basic building bloc... View full abstract»

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  • Top-down design of a switched-current video filter

    Publication Year: 2000, Page(s):73 - 81
    Cited by:  Papers (5)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (648 KB)

    A case study for the design of switched-current filters is presented. While the emphasis is on the step-by-step numerical design of a video filter, the design flow is applicable to any switched current filter. The chosen design example is a low pass elliptic ladder filter with the following specification: passband 0.5 dB equiripple, stop-band attenuation >30 dB, -3 dB frequency of 8 MHz, sampli... View full abstract»

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  • CMOS floating active inductor and its applications to bandpass filter and oscillator designs

    Publication Year: 2000, Page(s):42 - 48
    Cited by:  Papers (38)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (544 KB)

    A CMOS fully differential floating active inductor is realised by exploiting the intrinsic capacitance of the transistor. This technique allows the simulated inductor to operate closer to the fT, of the technology. Simulation results using SpectreRF with AMS 0.8 μm CMOS process show a self resonant frequency over 1 GHz, and independent tuning of the inductance and the series resistan... View full abstract»

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  • Analogue adaptive filters: past and present

    Publication Year: 2000, Page(s):82 - 90
    Cited by:  Papers (19)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (992 KB)

    Analogue adaptive filters represent an important niche in adaptive-filter theory and practice. The paper provides an overview of the field. Important adaptive algorithms, filter structures, circuit techniques and applications are all discussed. Considerable attention is paid to historically significant developments which have provided a foundation for modern analogue adaptive filters. Future direc... View full abstract»

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  • Active-MOSFET-C single-amplifier biquadratic filters for video frequencies

    Publication Year: 2000, Page(s):35 - 41
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (620 KB)

    The authors show how continuous-time active-RC filters can be implemented in CMOS by replacing all resistors by MOSFETs operating in the linear region. As an example, a 24 MHz active MOSFET-C single-amplifier biquadratic lowpass filter with a pole-Q of 3 implemented in a 0.6 μm CMOS process is discussed. By comparing measurements of a test chip, simulations and calculations, the following concl... View full abstract»

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  • Future implications of the log domain paradigm

    Publication Year: 2000, Page(s):65 - 72
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (880 KB)

    The implications of the recently proposed circuit design techniques surrounding the evolution of log domain filters, and in general, externally linear (ELIN) filters are explored. The discussion begins with a recapitulation of some classic filter design ideas which allow the development of log domain filters to be included as a natural extension. Then log domain filters of several types (i.e. clas... View full abstract»

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  • Low-power MOSFET-C 120 MHz Bessel allpass filter with extended tuning range

    Publication Year: 2000, Page(s):28 - 34
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (592 KB)

    An integrated delay cell for a disc-drive read channel has to combine a high 120 MHz bandwidth with a low power dissipation and a large 1:6 tuning range. Because of linearity and transfer requirements, the implementation is a continuous-time third-order Bessel allpass filter. An opamp-MOSFET-C configuration is best for low power consumption but has two problems: a small tuning range and often a lo... View full abstract»

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  • CMOS transconductance amplifiers, architectures and active filters: a tutorial

    Publication Year: 2000, Page(s):3 - 12
    Cited by:  Papers (115)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (892 KB)

    An updated version of a tutorial paper (see IEEE Circuits Devices Mag., vol. 2, no. 1, p. 20-32, 1985) on active filters using operational transconductance amplifiers (OTAs) is presented. The integrated circuit issues involved in active filters (using CMOS transconductance amplifiers) and the progress in this field in the last 15 years is addressed. CMOS transconductance amplifiers, nonlinearized ... View full abstract»

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  • Active LC filters on silicon

    Publication Year: 2000, Page(s):49 - 56
    Cited by:  Papers (20)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (768 KB)

    The paper deals with research toward the design of active LC filters on silicon. Subjects such as negative resistors, Q enhancement, dynamic range, filter synthesis, and automatic tuning are discussed View full abstract»

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