Active-only variable-gain low-pass filter for dual-mode multiphase sinusoidal oscillator application

Authors : Pipat PROMMEE, Narongsak MANOSITTHICHAI, Fabian KHATEB

Pages : 4326-4340

View : 27 | Download : 9

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :This research presents an active-only low-pass insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(MSO); was subsequently realized by cascading $n$ LP filters insert ignore into journalissuearticles values($n$ = 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 insert ignore into journalissuearticles values($n$ = 3); was constructed and experiments were performed. The experimental findings were agreeable with the simulation results.\vs{1mm}
Keywords : Low pass filter, sinusoidal oscillator, tunable, low voltage, active only