A 16 MHz CMOS RC Frequency Reference With ±90 ppm Inaccuracy From -45 °C to 85 °C

A 16 MHz CMOS RC Frequency Reference With ±90 ppm Inaccuracy From -45 °C to 85 °C

Gürleyük, C. (TU Delft Electronic Instrumentation)
Pan, S. (TU Delft Electronic Instrumentation)
Makinwa, K.A.A. (TU Delft Microelectronics)

Microelectronics

2022

This article presents a 16-MHz RC frequency reference implemented in a standard 180-nm CMOS process. It consists of a frequency-locked loop (FLL) in which the output frequency of a digitally controlled oscillator (DCO) is locked to the frequency-phase characteristic of a Wien bridge RC filter. Since it is made from on-chip resistors and capacitors, the filter's characteristic is temperature dependent. To compensate for this, the control signal of the DCO is derived by digitizing the filter's output phase and combining it with the digital output of a Wheatstone bridge temperature sensor. After a two-point trim, this digital temperature compensation scheme achieves an inaccuracy of ±90 ppm from -45 °C to 85 °C. The frequency reference draws 220 $\mu \text{A}$ from a 1.8-V supply, with a supply sensitivity of 0.12%/V and a 320-ppb Allan Deviation floor for a 10-s stride.

Bandwidth
CMOS
digital frequency-locked loop (FLL)
digitally controlled oscillator (DCO)
Frequency control
Frequency locked loops
integrated frequency reference
RC.
Resistors
Sensitivity
System-on-chip
Temperature sensors

http://resolver.tudelft.nl/uuid:063699bb-740d-4f44-945b-2e2eb8a66e7e

https://doi.org/10.1109/JSSC.2022.3142662

2023-07-01

0018-9200

IEEE Journal of Solid State Circuits, 57 (8), 2429-2437

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2022 C. Gürleyük, S. Pan, K.A.A. Makinwa