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    Active-only variable-gain low-pass filter for dual-mode multiphase sinusoidal oscillator application
    (2017-01-01)
    Prommee, Pipat
    ;
    Manositthichai, Narongsak
    ;
    Khateb, Fabian
    This research presents an active-only low-pass (LP) filter whose pole frequency and gain are independently tunable by means of bias current manipulation. The realization of the proposed LP filter required one operational amplifier, two operational transconductance amplifiers, and two MOS transistors. The multiphase sinusoidal oscillator (MSO) was subsequently realized by cascading n LP filters (n = 3) and loop-backing the output of the last LP filter to the input of the first LP filter. Simulations were carried out and the results revealed that the MSO could simultaneously achieve low impedance voltage and high impedance current outputs without the circuit topology alteration. The frequency of oscillation and the condition of oscillation could also be electronically tuned without disturbing each other. Furthermore, the sinusoidal signal of the MSO exhibited relatively low total harmonic distortion of about 0.8% at 2.75 MHz. To verify, a prototype of the active-only LP-based MSO (n = 3) was constructed and experiments were performed. The experimental findings were agreeable with the simulation results.
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    Low-component-count current-mode universal filter based on active-only lossy and lossless integrators
    (2008-12-01)
    Somdunyakanok, Montri
    ;
    Angkeaw, Krit
    ;
    Prommee, Pipat
    ;
    Kumngern, Montree
    An universal current-mode active-only filter using the biquadratic transfer function is proposed. The proposed circuit is realized by lossy and lossless integrators with minimize active components count without external passive elements. The different kinds of filter functions as lowpass, highpass, bandpass and band-reject response can be obtained without changing circuit topology. The proposed circuit implementation is realized by using MOS transistors, CMOS MO-OTAs, and CMOS OPAMPs. The parameters ω<inf>p</inf> can be tuned electronically through adjusting the transconductance gains of the OTA or electronic resistor power supplies. The simulation results are given by PSpice. © 2008 IEEE.