Electronically Controllable Current-Mode Multiphase Sinusoidal Oscillator for Biomedical Tissue Measurement Systems

Abstract—The design of current-mode multiphase sinusoidal oscillator (MSO) for biomedical tissue measurement system is presented. The odd phase system can be realised using current controlled current differencing transconductance amplifier (CCCDTA)-based lossy integrators. The condition of oscillation and frequency of oscillation can be controlled electronically and independently through adjusting the current of the CCCDTA. The high output impedances facilitate easy driving an external load without additional current buffers. The proposed MSO provides odd phase signals that are equally spaced in phase and equal amplitude. The circuit requires one CCCDTA and one grounded capacitor per phase without external resistor and additional current amplifier. The results of PSPICE simulations using BJT CCCDTA are included to verify theory.

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