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Author: search.filters.author.Pattanatadapong, Thanate

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    Log-domain all-pass filter and its application to quadrature sinusoidal oscillator
    (2011-10-13)
    Prommee, Pipat
    ;
    Pattanatadapong, Thanate
    ;
    Somdunyakanok, Montri
    A realization of current-mode log-domain all-pass filter is proposed. The circuit is a direct realization of a first-order differential equation for obtaining the low-pass filter. The proposed all-pass filter is realized by using log-domain low-pass filter. The log-domain all-pass filters is realized by using only 10 NPN transistors and a grounded capacitor for achieving low-power and fast response. The frequency response and stage gain can be electronically tuned through bias currents. An application of proposed log-domain all-pass filter is a quadrature sinusoidal oscillator. The proposed oscillator is obtained by cascading two all-pass filters loop. A validated BJT model which is used in SPICE simulation operated from a single power supply as low as 2V. The proposed circuit is also suitable for high-frequency applications. SPICE simulation results confirm the theoretical results. © 2011 IEEE.
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    Realization of tunable pole-Q current-mode OTA-C universal filter
    (2010-10-01)
    Prommee, Pipat
    ;
    Pattanatadapong, Thanate
    A realization of a current-mode operational transconductance amplifiercapacitor (OTA-C) universal filter with tunable pole-Q is proposed. A biquadratic band-reject function is used as the initial synthesis function based on three integrator blocks. Consequently, the proposed filter uses a total of three multiple-output OTAs and three grounded capacitors. Five types of transfer functions, namely, low-pass, high-pass, band-pass, band-reject, and all-pass responses, can be obtained without changing the circuit topology. The pole-Q (Q0) and the pole-frequency (?0) parameters are independently tuned. The Q0 and ?0 parameters are electronically tuned by adjusting the transconductance gains of the OTAs. Furthermore, Q0 can be tuned by varying the capacitor manually without affecting ?0. SPICE simulation results of the proposed filter are presented. © Springer Science+Business Media, LLC 2010.