A 19 µW 20 MHz All-Digital PLL for 2-tone envelope detection radios

G. Meuleman, P.J.A. Harpe, X. Huang, A.H.M. Roermund, van

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This paper describes the design and implementation of a low power IF frequency synthesizer which can be used in 2-tone envelope detection radios [1]. The synthesizer is based on an All-Digital PLL (AD-PLL) architecture. By means of a system noise analysis, overall noise performance is optimized while maintaining low-power operation. A current controlled ring-oscillator is designed, optimized for low-power and low phase-noise. An integer and fractional phase quantiser (PQ) is designed, where the fractional PQ is co-integrated with the oscillator to save power. The DAC, which digitally controls the oscillator, is implemented by a `coarse' and `fine' DAC topology to reduce the resolution requirement. The `fine' DAC resolution is increased by a third-order Delta-Sigma Modulator (DSM) to alleviate matching problems while maintaining monotonicity and keeping the power consumption low. Current division of the `fine' DAC, using a highly-linear current-mirror, enables fine frequency tuning while keeping low bias currents. The chip, consisting of a current controlled oscillator, `coarse' and `fine' DAC and fractional part of the phase quantiser is implemented in a 90 nm CMOS technology. The AD-PLL operates from 10 to 20 MHz and the power consumption (excluding digital loop filter and DSM) is only 19 µW at 20 MHz operation.
Original languageEnglish
Title of host publicationProceedings of the International Symposium on Circuits and Systems (ISCAS2014), 1-5 June 2014, Melbourne, Australia
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Print)978-1-4799-3431-7
Publication statusPublished - 2014
Event2014 IEEE International Symposium on Circuits and Systems (ISCAS 2014) - Melbourne, VIC, Australia, Melbourne, Australia
Duration: 1 Jun 20145 Jun 2014


Conference2014 IEEE International Symposium on Circuits and Systems (ISCAS 2014)
Abbreviated titleISCAS 2014
Internet address


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