Operational Transconductance Amplifier (OTA) based dual mode Multiphase Oscillator

This paper introduces a novel dual-mode multiphase oscillator employing an Operational Transconductance Amplifier (OTA) and grounded passive components. The circuit design incorporates a first-order low-pass network and an inverting buffer. The proposed circuit produces oscillations with uniform phase shifts and equal amplitudes. Notably, it offers both voltage and current mode outputs, making it compatible with both voltage and current input circuits while maintaining low power consumption. The functionality of the proposed circuit has been validated through PSPICE simulations conducted on 0.25µm TSMC CMOS technology.