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This article presents a temperature- and aging-compensated    $RC$    oscillator (TACO) in which the long-term drift of the main oscillator is compensated by periodically locking its frequency to that of the less-aged reference oscillator. To improve the long-term stability of the TACO, it employs techniques, such as the use of higher activation energy (   $E_{a}$   ) resistors, switched dual    $RC$    branches to mitigate stress from dc-current-induced electromigration (EM), and duty cycling to slow down the aging rate of the reference oscillator. Using the proposed techniques, a prototype 100-MHz    $RC$    oscillator fabricated in a 65-nm CMOS process achieves an inaccuracy of &#x00B1;1030 ppm from &#x2013;40 &#x00B0; C to 85 &#x00B0; C after 500 h of accelerated aging at 125 &#x00B0; C, with 5.1-   $\rm ps_{\mathrm{ rms}}$    period jitter and a power efficiency of 1.4    $\mu \text{W}$   /MHz.

ieee journal of solid-state circuits

A Temperature- and Aging-Compensated  RC  Oscillator With &#x00B1;1030-ppm Inaccuracy From40 &#x00B0;C to 85 &#x00B0;C After Accelerated Aging for 500 h at 125 &#x00B0;C