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IEEE Transactions on Circuits and Systems

Issue 6 • June 1980

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Displaying Results 1 - 21 of 21
  • Editorial

    Publication Year: 1980, Page(s):433 - 434
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    Freely Available from IEEE
  • An approach to programmable CTD filters using coefficients 0, + 1, and -1

    Publication Year: 1980, Page(s):451 - 456
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    A delta modulation-like sampled analog filter structure for realizing low-pass filters is described. The filter uses only the coefficients0, + 1, and-1and can be fabricated as a programmable CCD filter. Interpolation and decimation are employed to increase the accuracy of the delta modulation. It is shown that with this scheme a given response can be realized arbitrarily clos... View full abstract»

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  • Exact design of switched-capacitor bandpass filters using coupled-biquad structures

    Publication Year: 1980, Page(s):469 - 475
    Cited by:  Papers (67)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (785 KB)

    A method is presented for the design of switched-capacitor bandpass filters using the bilinearz-transform. The filters are realized in low-sensitivity coupled-biquad structures and employ biquad circuits which are completely insensitive to stray capacitances between any node and ground. Geometrically symmetric (both all-pole and finite-transmissionzeros) as well as general-parameter fil... View full abstract»

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  • Switched-capacitor filter design using bilinear element modeling

    Publication Year: 1980, Page(s):481 - 491
    Cited by:  Papers (41)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1093 KB)

    The low sensitivity of a doubly loaded reactance ladder to element-value variations is preserved in a switched-capacitor filter with the same graph if a one-to-one replacement of branch impedances is used to derive the switched filter from the reactance ladder. This paper describes the design principles and some novel circuits based on this approach. The frequency axes of the two filters are mappe... View full abstract»

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  • Optimum design of low-pass switched-capacitor ladder filters

    Publication Year: 1980, Page(s):522 - 527
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (671 KB)

    A general technique for realizing Bruton's LDI transformation in low-pass switched-capacitor ladder filters is presented, which results is switched-capacitor integrators that are insensitive to parasitic capacitances. It is shown that the correct filter response may be obtained by realizing only the stable poles of the LDI transformedLCnetwork. Realization of these "stable" poles is red... View full abstract»

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  • MOS switched-capacitor filters using voltage inverter switches

    Publication Year: 1980, Page(s):527 - 538
    Cited by:  Papers (27)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1798 KB)

    Low-sensitivity switched-capacitor filters imitatingLCandLC/unit-element structures can be built by means of capacitances, ordinary switches, and voltage inverter switches, the latter being quite simply realizable by electronic means (either with or even without operational amplifier). There are no restrictions on the operating rate (other than those resulting from the Nyquis... View full abstract»

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  • Switched-capacitor filters using FDNR-like super capacitances

    Publication Year: 1980, Page(s):569 - 573
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (366 KB)

    Switched-capacitor networks have become very attractive for the MOS/LSI realization of analog sampled-data filters. The work presented in this paper shows that thel/ptransformation wherep =(1 -z^{-2})/ {tau}can be performed for such filters similarly to Bruton's1/stransformation for analog continuous networks. An analog sampled-data filter based on this principle h... View full abstract»

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  • Low-sensitivity switched-capacitor ladder filters

    Publication Year: 1980, Page(s):475 - 480
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    A switched-capacitor filter design technique based on the LDI transformation is presented which uses a novel floating inductance simulation circuit. By choosing the filter terminations properly, the circuits are shown to preserve the maximum power transfer property. A low-pass filter design example is presented to illustrate the low-sensitivity property of this technique. View full abstract»

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  • A SAW filter for SSB waveform generation

    Publication Year: 1980, Page(s):464 - 468
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    Surface acoustic wave (SAW) devices are known to be capable of generating real-time Fourier transforms. This property has been successfully exploited in the past to enable implementation of so-called "transform domain filters" used primarily for interference rejection in spread spectrum communication systems. Filters designed in this manner have included programmable matched filters as well as ada... View full abstract»

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  • Equivalent circuits for switched-capacitor networks including recharging devices

    Publication Year: 1980, Page(s):539 - 544
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    Equivalent circuits for switched-capacitor (SC) networks including recharging devices are derived. Parasitic effects, like stray capacitances and nonideal op amps, are taken into account. As a result, the equivalent time-invariant network is split up into a frequency dependent impedance network and a purely (negative) resistive network which corresponds directly to the capacitor network of the SC-... View full abstract»

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  • An NMOS analog building block for telecommunication applications

    Publication Year: 1980, Page(s):552 - 559
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    In this paper an NMOS mask programmable building block chip, capable of up to 22 poles of switched-capacitor (SC) filtering is described. Although the major portion of the chip is devoted to active-SC filtering, such functions as antialiasing, reconstruction, and threshold detection can also be performed on chip. In addition, the chip includes an oscillator and a number of flip-flops and gates, so... View full abstract»

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  • Monolithic minimum phase CCD channel filter for a PCM codec employing overlapping-double-split-electrode technique

    Publication Year: 1980, Page(s):457 - 463
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    A monolithic CCD channel filter consisting of transmit-and-receive filters for a PCM codec was fabricated using a triple-layer polysilicon gate and NMOST process. This filter employed both a minimum phase design with a greatly reduced number of taps and newly developed overlapping-double-split-electrode (ODSE) structure in order to minimize chip area and eliminate excess capacitances at all of the... View full abstract»

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  • Considerations for high-frequency switched-capacitor ladder filters

    Publication Year: 1980, Page(s):545 - 552
    Cited by:  Papers (69)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    Monolithic filters using switched-capacitor techniques are beginning to be used in commercial audio frequency communication circuits [1], [2], [10]. The fact that these filters are MOS compatible, high precision and low power makes them very attractive in these filter applications. The usefulness of switched-capacitor filters will be greatly increased if the frequency range of these filters can be... View full abstract»

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  • Optimal low-sensitivity anti-aliasing and conversion filters

    Publication Year: 1980, Page(s):559 - 566
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    The problem of analyzing and synthesizing switched analog circuits for anti-aliasing purposes is investigated not only for the more common PCM/audio conversion (low-pass case) but also for PCM/FDM conversion (bandpass case), while possible other applications are pointed out. It is shown that by proper design the well-known low-sensitivity argument known from conventional doubly terminated reactanc... View full abstract»

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  • Design of low-sensitivity digital filters by linear transformations

    Publication Year: 1980, Page(s):435 - 444
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    In this paper, the linear transformation approach to the design of digital filter structures from analog doubly terminated lossless ladder filters is investigated. It is shown that there exist several families of linear transformations which all produce different realization schemes for digital filter structures that possess low sensitivity to variations in multiplier coefficients, the "wave digit... View full abstract»

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  • Switched-capacitor building blocks

    Publication Year: 1980, Page(s):492 - 501
    Cited by:  Papers (24)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (960 KB)

    The paper describes several new building blocks which can realize the general second-order sampled-data transfer function. These can be used to realize more complex functions either by cascading them or combining them in a multiple-feedback structure. View full abstract»

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  • An optimal design of split-electrode CCD transversal filters

    Publication Year: 1980, Page(s):445 - 451
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    A new optimal design method is introduced for split-electrode CCD transversal filters. This method uses mixed-integer programming techniques to quantize filter parameter values consistent with actual mask dimensions. It improves filter performance over other design methods that use roundoff approximation to quantize mask parameter values. As Illustrated through examples of low-pass and notch-filte... View full abstract»

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  • Ladder wave digital filters realizing complex attenuation poles

    Publication Year: 1980, Page(s):567 - 568
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    It is known that for wave digital filters (WDF) either their transmittance or their reflectance can be used as transfer function. So far, only the first possibility has been examined in detail. However, if a WDF is derived from a reference ladder network composed of inductances, capacitances, and/or unity elements, complex attenuation poles (transmission zeros) cannot then be obtained. It is shown... View full abstract»

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  • Switched-capacitor transconductance and related building blocks

    Publication Year: 1980, Page(s):502 - 508
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    A new element, the switched-capacitor transconductance, is developed and used to construct several other active switched-capacitor building blocks: amplifiers with gain defined by the ratio of capacitors, integrators, inductors, and gyrators. The element is also used to design a switched-capacitor biquad. All reported networks were fabricated with discrete components and tested. Experimental data ... View full abstract»

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  • Switched-capacitor decimation and interpolation circuits

    Publication Year: 1980, Page(s):509 - 514
    Cited by:  Papers (29)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    Novel switched-capacitor decimation and interpolation circuits are described. The decimator can function as an input stage, the interpolator as an output stage in a filter system. This allows the use of differing clock rates in the various stages of the system, which in turn can result in simpler antialiasing requirements, more practical element values and lower sensitivities for the individual fi... View full abstract»

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  • Switched-capacitor filter design using cascaded sections

    Publication Year: 1980, Page(s):515 - 521
    Cited by:  Papers (30)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    This paper describes a number of simple (first-, second-, or third-order) switched-capacitor circuits. These can be used as simple self-contained filters, or as filter sections in the cascade realization of a higher order transfer function. All these sections are free from parasitic effects, and all can be designed directly in the sampled-signal domain. Low-pass, high-pass, bandpass, and all-pass ... View full abstract»

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