A 16 MHz RC Frequency Reference with ± 450 ppm Inaccuracy from −45°C to 85° C After Accelerated Aging
K. Mohamed Ahmed Mohamed (TU Delft - Electronic Instrumentation)
N.G. Toth (TU Delft - Electronic Instrumentation)
Hui Jiang (TU Delft - Electronic Instrumentation)
Cagri Gürleyük (TU Delft - Electronic Instrumentation)
K.A.A. Makinwa (TU Delft - Microelectronics)
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Abstract
This paper presents a high-accuracy, low-drift 16 MHz RC frequency reference. It is based on a Wien bridge filter that incorporates silicided n-poly resistors and MIM capacitors, whose temperature coefficient is compensated by a PNP-based temperature sensor. After a 2-point trim, it achieves $\pm 350 \text{ppm}$ inaccuracy from $-45^{\circ} \mathrm{C}$ to 85° C, which increases to only $\pm 450$ ppm after accelerated aging. This represents competitive accuracy and state-of-the-art stability for RC-based frequency references, approaching that of their LC-based counterparts while dissipating lower power and occupying less area.
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