A ۰.۴ V Low Frequency Voltage-Controlled Ring Oscillator Using DTMOS Technique

In this paper, an ultra-low power ultra-low voltage five-stage low frequency voltage–controlled single-ended ring oscillator using dynamic threshold voltage MOSFET (DTMOS) is presented. The proposed oscillator is designed and simulated using TSMC ۰.۱۸μm RF CMOS technology with ۰.۴ V power supply. In this design all transistors working at the sub-threshold (weak inversion) region. The output frequency ranges from ۲۶.۶-۲۱۰.۵ kHz with control voltages of ۰ V to ۰.۴ V. Its power consumption and phase noise at a ۱۰۰ kHz offset at the minimum(maximum) oscillation frequency is respectively ۶.۴۲nW (۸.۶۲ nW) and -۱۲۰.۵ dBc/Hz (-۱۱۳.۱۵ dBc/Hz).

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