Abstract
This paper proposes a pull-up control scheme in the pseudo-CMOS inverter to design a low-power ring oscillator (RO) realized by only n-type transistors. For comparing 11-stages, the proposed RO and the conventional RO are both fabricated by metal–oxide thin-film transistors with the etch stop layer structure. It is measured that the power-delay product of the proposed RO is reduced by more than 50% under the same value of supply voltage. At the same oscillation frequency, the power consumption tends to be reduced by 18% as oscillation frequency increases. Furthermore, the peak-to-peak voltage of the proposed RO can almost receive a full swing at any supply voltage.
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