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A 1.8V supply multi-frequency digitally trimmable on-chip IC oscillator with low-voltage detection capability

Published: 04 September 2004 Publication History

Abstract

The design of a 1.8V power supply, multi-frequency on-chip IC oscillator with a built-in low voltage detection (LVD) circuitry is described. Since the modules share the same bandgap cell, the system includes a new bandgap isolation strategy based on wide swing cascode current mirrors to reduce noise coupling into the LVD. The IC oscillator generates four selectable clock frequencies: 4MHz and 8MHz from 1.8V to 5.5V, 12MHz and 22MHz from 2.7V to 5.5V. After fine-tuning the oscillator via digital trimming its output frequency varies less than ±2.5% around the target frequency over supply ranges and from -40 to 125°C. The measured clock jitter is below 0.1% whereas the recover time from stop is 5μs. The low voltage detection circuit monitors the supply voltage applied to the system and generates the appropriate warning or even initiates a system shutdown before the in-circuit SoC presents malfunction. The module was implemented in a 0.5μm CMOS technology, occupies an area of 360 x 530μm2 and requires no external reference or components.

References

[1]
Johns, D.A., and Martin, K., Analog Integrated Circuit Design, John Wiley & Sons, 1997.
[2]
Grebene, A.B., Bipolar and MOS Analog Integrated Circuit Design, John Wiley & Sons, 1984.
[3]
Olmos, A., "A temperature compensated fully-trimmable on-chip IC oscillator", Proc. SBCCI 2003, pp. 181--186, September 2003.
[4]
Olmos, A., Gomes A., Takiguti R., Clayton F., "A bandgap adjustment strategy for temperature centering and spread reduction", Proc. SBMicro 2001, pp. 82--86, September 2001.
[5]
Babanezhad, J.N., and Gregorian, N., "A Programmable Gain/Loss Circuit," IEEE J. of Solid-State Circuits, Vol. 22, no 6, pp. 1082--1090, December 1987.

Cited By

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  • (2013)Silicon-Based Frequency ReferencesElectrothermal Frequency References in Standard CMOS10.1007/978-1-4614-6473-0_2(15-44)Online publication date: 16-Feb-2013
  • (2009)A 66 $\mu$W 86 ppm$/^{\circ}$C Fully-Integrated 6 MHz Wienbridge Oscillator With a 172 dB Phase Noise FOMIEEE Journal of Solid-State Circuits10.1109/JSSC.2009.202191444:7(1990-2001)Online publication date: Jul-2009
  • (2008)A fully-integrated Wienbridge topology for ultra-low-power 86ppm/°C 65nm CMOS 6MHz clock reference with amplitude regulationESSCIRC 2008 - 34th European Solid-State Circuits Conference10.1109/ESSCIRC.2008.4681875(394-397)Online publication date: Sep-2008

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  1. A 1.8V supply multi-frequency digitally trimmable on-chip IC oscillator with low-voltage detection capability

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      cover image ACM Conferences
      SBCCI '04: Proceedings of the 17th symposium on Integrated circuits and system design
      September 2004
      296 pages
      ISBN:1581139470
      DOI:10.1145/1016568
      Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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      Publication History

      Published: 04 September 2004

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      Author Tags

      1. bandgap
      2. low-voltage detector
      3. oscillator
      4. relaxation
      5. trimming

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      Cited By

      View all
      • (2013)Silicon-Based Frequency ReferencesElectrothermal Frequency References in Standard CMOS10.1007/978-1-4614-6473-0_2(15-44)Online publication date: 16-Feb-2013
      • (2009)A 66 $\mu$W 86 ppm$/^{\circ}$C Fully-Integrated 6 MHz Wienbridge Oscillator With a 172 dB Phase Noise FOMIEEE Journal of Solid-State Circuits10.1109/JSSC.2009.202191444:7(1990-2001)Online publication date: Jul-2009
      • (2008)A fully-integrated Wienbridge topology for ultra-low-power 86ppm/°C 65nm CMOS 6MHz clock reference with amplitude regulationESSCIRC 2008 - 34th European Solid-State Circuits Conference10.1109/ESSCIRC.2008.4681875(394-397)Online publication date: Sep-2008

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