access icon free Differential rail-to-rail voltage-controlled quadrature ring oscillator for low-power implantable transceivers

© The Institution of Engineering and Technology
Received 14/08/2014, Published 16/10/2014
Errata or comment

A new low-power rail-to-rail voltage-controlled quadrature oscillator is presented. This oscillator was implemented to provide the frequency deviation of frequency-shift-keying (FSK) modulation in implantable radio-frequency (RF) transceivers. The quadrature oscillator circuit generates differential in-phase and quadrature-phase (I and Q) signals in a two-stage ring configuration. The proposed structure of delay cells and the start-up circuit were implemented using IBM 130 nm CMOS technology. The frequency can be tuned between 300 kHz and 11.57 MHz by varying the supply voltage from 0.35 to 0.9 V. An average current of 5.5 µA (2.5 µW) was consumed to generate rail-to-rail differential quadrature signals with a frequency of 2 MHz as the target operating point dedicated to low-power implantable transceivers.

Inspec keywords: prosthetics; low-power electronics; frequency shift keying; CMOS analogue integrated circuits; radio transceivers; oscillators

Other keywords: low-power implantable transceivers; current 5.5 muA; differential rail-to-rail voltage-controlled quadrature ring oscillator; start-up circuit; implantable radiofrequency transceivers; quadrature-phase signal; power 2.5 muW; delay cells; two-stage ring configuration; quadrature oscillator circuit; frequency-shift-keying modulation; voltage 0.35 V to 0.9 V; implantable RF transceivers; IBM CMOS technology; low-power rail-to-rail voltage-controlled quadrature oscillator; frequency deviation; differential in-phase signal; FSK modulation

Subjects: Radio links and equipment; Oscillators; Modulation and coding methods; Prosthetics and orthotics

References

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      • 3. Sundaresan, K., Brouse, K.C., U-Yen, K., Ayazi, F., Allen, P.E.: ‘A 7 MHz process, temperature and supply compensated clock oscillator in 0.25 pm CMOS’. Int. Symp. on Circuits and Systems, Kos, Greece, May 2006, pp. I-693-I696, doi: 10.1109/ISCAS.2003.1205658.
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      • 2. Barthelemy, H., Meillere, S., Bourdel, S.: ‘Single ended rail-to-rail CMOS OTA based variable-frequency ring-oscillator’. Proc. of the Int. Symp. on Circuits and Systems, Vancouver, Canada, May 2004, pp. IV-537-540, doi: 10.1109/ISCAS.2004.1329059.
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