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.
Originele taal-2Engels
TitelProceedings of the International Symposium on Circuits and Systems (ISCAS2014), 1-5 June 2014, Melbourne, Australia
Plaats van productiePiscataway
UitgeverijInstitute of Electrical and Electronics Engineers
ISBN van geprinte versie978-1-4799-3431-7
StatusGepubliceerd - 2014
Evenement2014 IEEE International Symposium on Circuits and Systems (ISCAS) - Melbourne, VIC, Australia, Melbourne, Australië
Duur: 1 jun. 20145 jun. 2014


Congres2014 IEEE International Symposium on Circuits and Systems (ISCAS)
Verkorte titelISCAS 2014
AnderInternational Symposium on Circuits and Systems 2014, Melbourne, Australia
Internet adres


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