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Stefan Heinen - One of the best experts on this subject based on the ideXlab platform.

  • ISCAS - Capacitive crosscoupling biquad Polyphase Filter
    2009 IEEE International Symposium on Circuits and Systems, 2009
    Co-Authors: M Robens, Ralf Wunderlich, Stefan Heinen
    Abstract:

    In this paper, the design of biquad Polyphase Filters with capacitive crosscouplings is presented. Based on the elementary equation s → s - j w c , which describes the frequency shifting, system theoretic modeling is used for design. Some important observations simplifying the design process are denoted. The developed structures have been simulated in Cadence using operational amplifier models with adjustable gain and bandwidth. Results are compared to those of a Tow-Thomas Polyphase Filter with comparable sum capacitance but with an operational amplifier amount twice as high. By limiting the gain bandwidth product of the models to reasonable values it is shown that operational amplifier performance does not need to be improved and hence a reduced power consumption can be expected.

  • sallen key Polyphase Filter design
    International Conference on Electronics Circuits and Systems, 2008
    Co-Authors: M Robens, Ralf Wunderlich, Stefan Heinen
    Abstract:

    Present wireless receiver designs often make use of low intermediate frequency structures for signal reception. These topologies frequently apply Polyphase Filters for noise and image signal attenuation. When using active-RC implementations of single pole or direct synthesis structures, the number of operational amplifiers and thus power consumption becomes high. To confine the latter, a Sallen-Key based Polyphase Filter is presented in this paper which reduces the amplifier amount by one half. Furthermore, the system theoretic method used for circuit design is shown. Results are verified by Cadence simulation.

  • ICECS - Sallen-Key Polyphase Filter design
    2008 15th IEEE International Conference on Electronics Circuits and Systems, 2008
    Co-Authors: M Robens, Ralf Wunderlich, Stefan Heinen
    Abstract:

    Present wireless receiver designs often make use of low intermediate frequency structures for signal reception. These topologies frequently apply Polyphase Filters for noise and image signal attenuation. When using active-RC implementations of single pole or direct synthesis structures, the number of operational amplifiers and thus power consumption becomes high. To confine the latter, a Sallen-Key based Polyphase Filter is presented in this paper which reduces the amplifier amount by one half. Furthermore, the system theoretic method used for circuit design is shown. Results are verified by Cadence simulation.

  • a Polyphase Filter design for continuous time quadrature bandpass sigma delta modulators
    IEEE Transactions on Circuits and Systems, 2008
    Co-Authors: Song-bok Kim, M Robens, Ralf Wunderlich, S. Joeres, Stefan Heinen
    Abstract:

    This paper presents a strategy for successful Polyphase-Filter design for continuous-time quadrature bandpass sigma-delta (SigmaDelta) modulators. Based on a low-pass Filter with a chain of integrators with weighted capacitive feedforward summation (CICFF) topology - which is suited for implementation in low-power applications - analytical equations are derived. A new compensation scheme is proposed and implemented by cross-coupling additional resistors, without the necessity of extra-active components. Translation to intermediate frequency in second- and fourth-order Polyphase Filters with the proposed compensation scheme are compared to analytical considerations and simulation. Nonlinearities introduced by mismatch of feedforward coefficients and finite gain-bandwidth of amplifiers are considered.

  • A Polyphase Filter Design for Continuous-Time
    2008
    Co-Authors: Song-bok Kim, M Robens, Ralf Wunderlich, S. Joeres, Stefan Heinen
    Abstract:

    This paper presents a strategy for successful Polyphase-Filter design for continuous-time quadrature band- pass sigma-delta modulators. Based on a low-pass Filter with a chain of integrators with weighted capacitive feedforward summation (CICFF) topology—which is suited for implementa- tion in low-power applications—analytical equations are derived. A new compensation scheme is proposed and implemented by cross-coupling additional resistors, without the necessity of extra-active components. Translation to intermediate frequency in second- and fourth-order Polyphase Filters with the proposed compensation scheme are compared to analytical considerations and simulation. Nonlinearities introduced by mismatch of feed- forward coefficients and finite gain-bandwidth of amplifiers are considered. Index Terms—Analog-digital conversion, chain of integrators with weighted capacitive feedforward summation (CICFF), chain of integrators with weighted feedforward summation (CIFF), complex Filter, continuous-time (CT) circuit, Polyphase Filter, quadrature bandpass sigma-delta modulator.

M Robens - One of the best experts on this subject based on the ideXlab platform.

  • ISCAS - Capacitive crosscoupling biquad Polyphase Filter
    2009 IEEE International Symposium on Circuits and Systems, 2009
    Co-Authors: M Robens, Ralf Wunderlich, Stefan Heinen
    Abstract:

    In this paper, the design of biquad Polyphase Filters with capacitive crosscouplings is presented. Based on the elementary equation s → s - j w c , which describes the frequency shifting, system theoretic modeling is used for design. Some important observations simplifying the design process are denoted. The developed structures have been simulated in Cadence using operational amplifier models with adjustable gain and bandwidth. Results are compared to those of a Tow-Thomas Polyphase Filter with comparable sum capacitance but with an operational amplifier amount twice as high. By limiting the gain bandwidth product of the models to reasonable values it is shown that operational amplifier performance does not need to be improved and hence a reduced power consumption can be expected.

  • sallen key Polyphase Filter design
    International Conference on Electronics Circuits and Systems, 2008
    Co-Authors: M Robens, Ralf Wunderlich, Stefan Heinen
    Abstract:

    Present wireless receiver designs often make use of low intermediate frequency structures for signal reception. These topologies frequently apply Polyphase Filters for noise and image signal attenuation. When using active-RC implementations of single pole or direct synthesis structures, the number of operational amplifiers and thus power consumption becomes high. To confine the latter, a Sallen-Key based Polyphase Filter is presented in this paper which reduces the amplifier amount by one half. Furthermore, the system theoretic method used for circuit design is shown. Results are verified by Cadence simulation.

  • ICECS - Sallen-Key Polyphase Filter design
    2008 15th IEEE International Conference on Electronics Circuits and Systems, 2008
    Co-Authors: M Robens, Ralf Wunderlich, Stefan Heinen
    Abstract:

    Present wireless receiver designs often make use of low intermediate frequency structures for signal reception. These topologies frequently apply Polyphase Filters for noise and image signal attenuation. When using active-RC implementations of single pole or direct synthesis structures, the number of operational amplifiers and thus power consumption becomes high. To confine the latter, a Sallen-Key based Polyphase Filter is presented in this paper which reduces the amplifier amount by one half. Furthermore, the system theoretic method used for circuit design is shown. Results are verified by Cadence simulation.

  • a Polyphase Filter design for continuous time quadrature bandpass sigma delta modulators
    IEEE Transactions on Circuits and Systems, 2008
    Co-Authors: Song-bok Kim, M Robens, Ralf Wunderlich, S. Joeres, Stefan Heinen
    Abstract:

    This paper presents a strategy for successful Polyphase-Filter design for continuous-time quadrature bandpass sigma-delta (SigmaDelta) modulators. Based on a low-pass Filter with a chain of integrators with weighted capacitive feedforward summation (CICFF) topology - which is suited for implementation in low-power applications - analytical equations are derived. A new compensation scheme is proposed and implemented by cross-coupling additional resistors, without the necessity of extra-active components. Translation to intermediate frequency in second- and fourth-order Polyphase Filters with the proposed compensation scheme are compared to analytical considerations and simulation. Nonlinearities introduced by mismatch of feedforward coefficients and finite gain-bandwidth of amplifiers are considered.

  • A Polyphase Filter Design for Continuous-Time
    2008
    Co-Authors: Song-bok Kim, M Robens, Ralf Wunderlich, S. Joeres, Stefan Heinen
    Abstract:

    This paper presents a strategy for successful Polyphase-Filter design for continuous-time quadrature band- pass sigma-delta modulators. Based on a low-pass Filter with a chain of integrators with weighted capacitive feedforward summation (CICFF) topology—which is suited for implementa- tion in low-power applications—analytical equations are derived. A new compensation scheme is proposed and implemented by cross-coupling additional resistors, without the necessity of extra-active components. Translation to intermediate frequency in second- and fourth-order Polyphase Filters with the proposed compensation scheme are compared to analytical considerations and simulation. Nonlinearities introduced by mismatch of feed- forward coefficients and finite gain-bandwidth of amplifiers are considered. Index Terms—Analog-digital conversion, chain of integrators with weighted capacitive feedforward summation (CICFF), chain of integrators with weighted feedforward summation (CIFF), complex Filter, continuous-time (CT) circuit, Polyphase Filter, quadrature bandpass sigma-delta modulator.

Ralf Wunderlich - One of the best experts on this subject based on the ideXlab platform.

  • ISCAS - Capacitive crosscoupling biquad Polyphase Filter
    2009 IEEE International Symposium on Circuits and Systems, 2009
    Co-Authors: M Robens, Ralf Wunderlich, Stefan Heinen
    Abstract:

    In this paper, the design of biquad Polyphase Filters with capacitive crosscouplings is presented. Based on the elementary equation s → s - j w c , which describes the frequency shifting, system theoretic modeling is used for design. Some important observations simplifying the design process are denoted. The developed structures have been simulated in Cadence using operational amplifier models with adjustable gain and bandwidth. Results are compared to those of a Tow-Thomas Polyphase Filter with comparable sum capacitance but with an operational amplifier amount twice as high. By limiting the gain bandwidth product of the models to reasonable values it is shown that operational amplifier performance does not need to be improved and hence a reduced power consumption can be expected.

  • sallen key Polyphase Filter design
    International Conference on Electronics Circuits and Systems, 2008
    Co-Authors: M Robens, Ralf Wunderlich, Stefan Heinen
    Abstract:

    Present wireless receiver designs often make use of low intermediate frequency structures for signal reception. These topologies frequently apply Polyphase Filters for noise and image signal attenuation. When using active-RC implementations of single pole or direct synthesis structures, the number of operational amplifiers and thus power consumption becomes high. To confine the latter, a Sallen-Key based Polyphase Filter is presented in this paper which reduces the amplifier amount by one half. Furthermore, the system theoretic method used for circuit design is shown. Results are verified by Cadence simulation.

  • ICECS - Sallen-Key Polyphase Filter design
    2008 15th IEEE International Conference on Electronics Circuits and Systems, 2008
    Co-Authors: M Robens, Ralf Wunderlich, Stefan Heinen
    Abstract:

    Present wireless receiver designs often make use of low intermediate frequency structures for signal reception. These topologies frequently apply Polyphase Filters for noise and image signal attenuation. When using active-RC implementations of single pole or direct synthesis structures, the number of operational amplifiers and thus power consumption becomes high. To confine the latter, a Sallen-Key based Polyphase Filter is presented in this paper which reduces the amplifier amount by one half. Furthermore, the system theoretic method used for circuit design is shown. Results are verified by Cadence simulation.

  • a Polyphase Filter design for continuous time quadrature bandpass sigma delta modulators
    IEEE Transactions on Circuits and Systems, 2008
    Co-Authors: Song-bok Kim, M Robens, Ralf Wunderlich, S. Joeres, Stefan Heinen
    Abstract:

    This paper presents a strategy for successful Polyphase-Filter design for continuous-time quadrature bandpass sigma-delta (SigmaDelta) modulators. Based on a low-pass Filter with a chain of integrators with weighted capacitive feedforward summation (CICFF) topology - which is suited for implementation in low-power applications - analytical equations are derived. A new compensation scheme is proposed and implemented by cross-coupling additional resistors, without the necessity of extra-active components. Translation to intermediate frequency in second- and fourth-order Polyphase Filters with the proposed compensation scheme are compared to analytical considerations and simulation. Nonlinearities introduced by mismatch of feedforward coefficients and finite gain-bandwidth of amplifiers are considered.

  • A Polyphase Filter Design for Continuous-Time
    2008
    Co-Authors: Song-bok Kim, M Robens, Ralf Wunderlich, S. Joeres, Stefan Heinen
    Abstract:

    This paper presents a strategy for successful Polyphase-Filter design for continuous-time quadrature band- pass sigma-delta modulators. Based on a low-pass Filter with a chain of integrators with weighted capacitive feedforward summation (CICFF) topology—which is suited for implementa- tion in low-power applications—analytical equations are derived. A new compensation scheme is proposed and implemented by cross-coupling additional resistors, without the necessity of extra-active components. Translation to intermediate frequency in second- and fourth-order Polyphase Filters with the proposed compensation scheme are compared to analytical considerations and simulation. Nonlinearities introduced by mismatch of feed- forward coefficients and finite gain-bandwidth of amplifiers are considered. Index Terms—Analog-digital conversion, chain of integrators with weighted capacitive feedforward summation (CICFF), chain of integrators with weighted feedforward summation (CIFF), complex Filter, continuous-time (CT) circuit, Polyphase Filter, quadrature bandpass sigma-delta modulator.

Song-bok Kim - One of the best experts on this subject based on the ideXlab platform.

  • a Polyphase Filter design for continuous time quadrature bandpass sigma delta modulators
    IEEE Transactions on Circuits and Systems, 2008
    Co-Authors: Song-bok Kim, M Robens, Ralf Wunderlich, S. Joeres, Stefan Heinen
    Abstract:

    This paper presents a strategy for successful Polyphase-Filter design for continuous-time quadrature bandpass sigma-delta (SigmaDelta) modulators. Based on a low-pass Filter with a chain of integrators with weighted capacitive feedforward summation (CICFF) topology - which is suited for implementation in low-power applications - analytical equations are derived. A new compensation scheme is proposed and implemented by cross-coupling additional resistors, without the necessity of extra-active components. Translation to intermediate frequency in second- and fourth-order Polyphase Filters with the proposed compensation scheme are compared to analytical considerations and simulation. Nonlinearities introduced by mismatch of feedforward coefficients and finite gain-bandwidth of amplifiers are considered.

  • A Polyphase Filter Design for Continuous-Time
    2008
    Co-Authors: Song-bok Kim, M Robens, Ralf Wunderlich, S. Joeres, Stefan Heinen
    Abstract:

    This paper presents a strategy for successful Polyphase-Filter design for continuous-time quadrature band- pass sigma-delta modulators. Based on a low-pass Filter with a chain of integrators with weighted capacitive feedforward summation (CICFF) topology—which is suited for implementa- tion in low-power applications—analytical equations are derived. A new compensation scheme is proposed and implemented by cross-coupling additional resistors, without the necessity of extra-active components. Translation to intermediate frequency in second- and fourth-order Polyphase Filters with the proposed compensation scheme are compared to analytical considerations and simulation. Nonlinearities introduced by mismatch of feed- forward coefficients and finite gain-bandwidth of amplifiers are considered. Index Terms—Analog-digital conversion, chain of integrators with weighted capacitive feedforward summation (CICFF), chain of integrators with weighted feedforward summation (CIFF), complex Filter, continuous-time (CT) circuit, Polyphase Filter, quadrature bandpass sigma-delta modulator.

  • A Polyphase Filter Design for Continuous-Time Quadrature Bandpass Sigma–Delta Modulators
    IEEE Transactions on Circuits and Systems I: Regular Papers, 2008
    Co-Authors: Song-bok Kim, M Robens, Ralf Wunderlich, S. Joeres, Stefan Heinen
    Abstract:

    This paper presents a strategy for successful Polyphase-Filter design for continuous-time quadrature bandpass sigma-delta (SigmaDelta) modulators. Based on a low-pass Filter with a chain of integrators with weighted capacitive feedforward summation (CICFF) topology - which is suited for implementation in low-power applications - analytical equations are derived. A new compensation scheme is proposed and implemented by cross-coupling additional resistors, without the necessity of extra-active components. Translation to intermediate frequency in second- and fourth-order Polyphase Filters with the proposed compensation scheme are compared to analytical considerations and simulation. Nonlinearities introduced by mismatch of feedforward coefficients and finite gain-bandwidth of amplifiers are considered.

Haruo Kobayashi - One of the best experts on this subject based on the ideXlab platform.

  • Pass-Band Gain Improvement Technique for Passive RC Polyphase Filter in Bluetooth Low-IF Receiver Using Two RC Band-Stop Filters
    Advanced Engineering Forum, 2020
    Co-Authors: Minh Tri Tran, Nene Kushita, Anna Kuwana, Haruo Kobayashi
    Abstract:

    This paper proposes a method to design a flat pass-band gain with two RC band-stop Filters for a 4-stage passive RC Polyphase Filter in a Bluetooth receiver. Based on the superposition principle, the transfer function of the poplyphase Filter is derived. However, the pass-band gain of this Filter is not flat on the positive frequency domain. There are two local maximum values when the input signals are the wanted signals. Therefore, two RC band-stop Filters are used to improve the pass-band gain of these local maximum values. As a result, a flat pass-band gain passive RC poly-phase Filter is designed for a Bluetooth low-IF receiver which image rejection ratio is-36dB, and ripple gain is 0.47dB.

  • analysis and evaluation method of rc Polyphase Filter
    International Conference on ASIC, 2019
    Co-Authors: Koji Asami, Minh Tri Tran, Nene Kushita, Anna Kuwana, Yoshiro Tamura, Akemi Hatta, Haruo Kobayashi
    Abstract:

    RC Polyphase Filter is a complex analog Filter and has asymmetric frequency characteristics with respect to DC. It is composed of resistors and capacitors, and has complex analog input / output ports. Since this type of Filter can partially realize Hilbert transform, it can be used for generating orthogonal signals. In the field of wireless communications, it can also be used for suppressing interference signals by combining the Low-IF receiver topologies. In this paper, we introduce a technique to evaluate the mismatch characteristics between the real path and the imaginary path in the RC Polyphase Filter. These studies could lead the complex analog processing to apply for the wideband wireless communications.

  • ASICON - Flat Pass-Band Method with Two RC Band-Stop Filters for 4-Stage Passive RC Polyphase Filter in Low-IF Receiver Systems
    2019 IEEE 13th International Conference on ASIC (ASICON), 2019
    Co-Authors: Minh Tri Tran, Nene Kushita, Anna Kuwana, Haruo Kobayashi
    Abstract:

    This paper proposes a flat pass-band for a 4-stage passive RC Polyphase Filter in a blue-tooth low-IF receiver system; there the bandwidth is 8MHz, the center IF frequency is 4MHz, and the required image rejection ratio is

  • ASICON - Analysis and Evaluation Method of RC Polyphase Filter
    2019 IEEE 13th International Conference on ASIC (ASICON), 2019
    Co-Authors: Koji Asami, Minh Tri Tran, Nene Kushita, Anna Kuwana, Yoshiro Tamura, Akemi Hatta, Haruo Kobayashi
    Abstract:

    RC Polyphase Filter is a complex analog Filter and has asymmetric frequency characteristics with respect to DC. It is composed of resistors and capacitors, and has complex analog input / output ports. Since this type of Filter can partially realize Hilbert transform, it can be used for generating orthogonal signals. In the field of wireless communications, it can also be used for suppressing interference signals by combining the Low-IF receiver topologies. In this paper, we introduce a technique to evaluate the mismatch characteristics between the real path and the imaginary path in the RC Polyphase Filter. These studies could lead the complex analog processing to apply for the wideband wireless communications.

  • RC Polyphase Filter as complex analog Hilbert Filter
    2016 13th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT), 2016
    Co-Authors: Yoshiro Tamura, Ryo Sekiyama, Koji Asami, Haruo Kobayashi
    Abstract:

    This paper presents that the RC Polyphase Filter has characteristics as a complex analog Hilbert Filter. Phase characteristics of the RC Polyphase Filter have the same as the Hilbert Filter. Also its gain characteristics can be approximated as the Hilbert Filter; as its order becomes higher, its gain characteristics become closer to the Hilbert Filter. We have proved these for 1st to 4th RC Polyphase Filters, as well as in general n-th order case, and also confirmed with numerical simulations.