Kazuyuki Wada

Publications (10)1.18 Total impact

• Conference Proceeding: Multi-path Filters Robust to Substrate Noise and Nonlinearity.

  Kazuyuki Wada, Yukiya Kiyokawa, Retdian A. Nicodimus, Shigetaka Takagi, Takahide Sato, Nobuo Fujii
  International Symposium on Circuits and Systems (ISCAS 2009), 24-17 May 2009, Taipei, Taiwan; 01/2009
• Article: A 0.8-V Syllabic-Companding Log Domain Filter with 78-dB Dynamic Range in 0.35-µm CMOS.

  Ippei Akita, Kazuyuki Wada, Yoshiaki Tadokoro
  IEICE Transactions. 01/2008; 91-C:87-95.
• Article: Multi-Path Analog Circuits Robust to Digital Substrate Noise.

  Shigetaka Takagi, Retdian A. Nicodimus, Kazuyuki Wada, Takahide Sato, Nobuo Fujii
  IEICE Transactions. 01/2008; 91-A:535-541.
• Article: Synthesis Method of All Low-Voltage CMOS Instantaneous-Companding Log Domain Integrators.

  Ippei Akita, Kazuyuki Wada, Yoshiaki Tadokoro
  IEICE Transactions. 01/2007; 90-A:339-350.
• Source

  Available from: jbnu.ac.kr

  Article: Band Connections for Digital Substrate Noise Reduction Using Active Cancellation Circuits.

  Hiroto Suzuki, Kazuyuki Wada, Yoshiaki Tadokoro
  IEICE Transactions. 01/2007; 90-A:372-379.
• Article: Design Optimization of Active Shield Circuits for Digital Noise Suppression Based on Average Noise Evaluation.

  Retdian A. Nicodimus, Hiroto Suzuki, Kazuyuki Wada, Shigetaka Takagi
  IEICE Transactions. 01/2005; 88-A:444-450.
• Article: Active Shield Circuit for Digital Noise Suppression in Mixed-Signal Integrated Circuits.

  Retdian A. Nicodimus, Shigetaka Takagi, Kazuyuki Wada
  IEICE Transactions. 01/2005; 88-A:438-443.
• Conference Proceeding: Active guard band circuit for substrate noise suppression.

  Shigetaka Takagi, N. R. Agung, Kazuyuki Wada, Nobuo Fujii
  International Symposium on Circuits and Systems (ISCAS 2001), 6-9 May 2001, Sydney, Australia; 01/2001
• Article: Automatic Tuning System for Integrator-Based Continuous-Time Filters

  Kazuyuki Wada, Shigetaka Takagi, Nobuo Fujii
  [show abstract] [hide abstract]
  ABSTRACT: This paper proposes an automatic tuning system to adjust frequency characteristics of integrated continuous-time filters especially at high frequencies. Frequency characteristic deterioration of a filter using integrators with electrically controllable unity-gain frequencies can be easily evaluated and compensated even when they are affected by deviations of element values and parasitic elements. The compensation requires detection of both frequency and excess phase shifts of the integrators. Their two values are electrically detected by two detection systems usually used in the conventional frequency tuning system. The proposed system is stable, simple and easy to be implemented on an integrated circuit. As an example a 4th-order biquad bandpass filter with 10 MHz center frequency, 2 MHz passband width, and 0.5 dB passband ripples is designed using a bipolar process. Simulation results by SPICE show the effectiveness of the proposed system.
  Analog Integrated Circuits and Signal Processing 01/1998; 16(3):225-238. · 0.59 Impact Factor
• Article: Topology-independent predistortion for integrator-based filters

  Kazuyuki Wada, Shigetaka Takagi, Zdzislaw Czarnul, Nobuo Fujii
  [show abstract] [hide abstract]
  ABSTRACT: This paper proposes a topology-independent predistortion for filters using integrators. This employs integrators having the same structure, the same-value elements and an electrically controllable unity-gain frequency and compensates for the deviation of frequency characteristics due to excess phase shifts of integrators without knowledge of a filter topology. The effectiveness of the proposed method is demonstrated through SPICE simulations.
  Analog Integrated Circuits and Signal Processing 01/1996; 11(2):119-128. · 0.59 Impact Factor