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Author: search.filters.author.Angkeaw, KritSubject: search.filters.subject.Electronically-controlled

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    Tunable PID controller based on log-domain circuits
    (2015-10-09)
    Angkeaw, Krit
    ;
    Prommee, Tanakrit
    ;
    Prommee, Pipat
    Current-mode proportional plus integral plus derivative (PID) controller based on log-domain concept is presented in this paper. The parameters of P, I, and D blocks can be independently controlled through bias currents. Only grounded capacitors are employed as a passive element for achieving the time-constant of I and D controllers. In each block of I and D controllers are easily constructed by using 10 bipolar transistors and a grounded capacitor except P controller uses only 4 bipolar transistors without any resistors. Thus, it is suitable for integrated circuits realization. Single power supply voltage 2.5V is used. The characteristics of PID are simulated is by SPICE. The demonstrated results are in good agreement with the theoretical expectations.
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    Tunable current-mode log-domain universal filter
    (2010-08-31)
    Prommee, Pipat
    ;
    Somdunyakanok, Montri
    ;
    Angkeaw, Krit
    ;
    Dejhan, Kobchai
    This paper describes the design of a current-mode universal filter based on log-domain filtering concept. The circuit is a direct realization of a first-order differential equation for obtaining the two integrators loop structure. Lossless integrators are realized by log-domain lossy integrators. The proposed filter comprises only two grounded capacitors and sixteen transistors. Frequency response of the proposed filter can be instantaneously controlled over a very wide frequency range by controlling current. Quality factor is independently controlled by another current. It can be seen that the proposed circuit suites for high-frequency applications. A validated BJT model that used in simulation is operated by a single power supply as low as 2.5V. The wide-range frequency response is controlled over five decades of current controlled. ©2010 IEEE.