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Title: The Development of Current-mode Multiphase Sinusoidal Oscillator for Analog Integrated Circuit
Authors: Assistance Professor Dr. Prungsak Uttaphut
Keywords: multiphase sinusoidal oscillator
Issue Date: 2555
Abstract: This research presents the development and design of a multiphase sinusoidal oscillator (MSO) using CCCCTA-based first order lowpass filters (lossy integrators). The features of the proposed MSO are that: (1) Use of grounded capacitors and identical circuit configuration for each section in the MSO topology. (2) The electronic tunability of oscillation condition and oscillation frequency. (3) High-impedance current outputs. (4) The possibility of generating multi-phase signals for both an even and an odd number of equally-spaced in phases. (5) Independent tuning of the oscillation frequency and the oscillation condition. (6) Equality of amplitudes of each phase due to utilizing identical sections. (7) Requirement for only one CCCCTA as the active element for each phase without any additional current amplifiers and external resistors. The proposed circuit is then suitable for IC architecture The PSpice simulations using the parameters of PR200N and NR200N bipolar transistors of ALA400 transistor array with ±2V voltage supply, C=40pF, IB1=50μA and IB2=780μA show that at 4.387MHz and 2.575MHz of oscillation frequencies for 3 and 4 phase system, the total harmonic distortions (THD) are about 0.479% and 0.798%, respectively. Moreover, the experimental results using commercial ICs (AD844 and LT1228) agree well with the theoretical anticipation.
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