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Author: search.filters.author.Tiamsuphat, AphinatSubject: search.filters.subject.Elliptic

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    Electronically tunable MOS-only current-mode high-order band-pass filters
    (2017-01-01)
    Prommee, Pipat
    ;
    Tiamsuphat, Aphinat
    ;
    Taher Abuelma'Atti, Muhammad
    This paper presents new CMOS current-mode ladder Chebyshev and elliptic band-pass filters (BPFs). The signal flow graph and the network transformation methods are used to synthesize the proposed BPFs by using Chebyshev and elliptic RLC low-pass prototypes. CMOS-based lossy and lossless integrators with grounded capacitors are used to synthesize the proposed BPFs. The proposed filters can be electronically tuned between 10 kHz and 100 MHz by adjusting the bias current from 0.02 A to 200 A. Both filters use a 1.5 V DC power supply, which leads to low dynamic power consumption. Both filters enjoy total harmonic distortion of less than 1.5% along the range of the tuning bias currents. Simulation results are included to illustrate the functionality of the proposed filters.
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    Electronically tunable voltage-mode Elliptic third-order ladder low-pass filter using simple OTA
    (2014-01-27)
    Tiamsuphat, Aphinat
    ;
    Prommee, Pipat
    This paper presents Elliptic third-order voltage-mode ladder low-pass filter based on CMOS technology, Using OTA. Third-order low pass filter is designed based on RLC Elliptic Ladder low-pass filter prototype. The proposed filter contains lossless integrators and voltage gains. The frequency responses of low-pass filter can be electronically tuned between around 3kHz and 2MHz by adjusting bias current from 0.01μA to 10μA with 1mW of dynamic power consumption along the tuning range. The circuit used ±1.5V power supply and used of ground capacitors which suit to integrated circuit. THD of low-pass filter can be obtained less than 0.7% along the operating frequencies. PSPICE simulation results are carried out to confirm the theory by using TSMC 0.18μm CMOS technology.