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Impact of AAC design on phase noise performance of VCOsThe automatic amplitude control (AAC) system is a servo-circuit of voltage-controlled oscillators (VCOs) that proves important for the practical implementation of fully integrated RF front-ends. Nevertheless, the noise contributed by the AAC can degrade the phase noise performance of the oscillator. In this paper, the time-varying noise transfer of the peak detector is analyzed, since it is recognized as the critical noise source in the simple AAC loop taken as reference. A fast rule to predict the noise spectral density at the peak detector output is given that substantially facilitates the estimate of the phase noise degradation on the VCO output. The analysis has been carried out both theoretically and by simulation; experimental validation has also been provided by means of a discrete-components test board. Guidelines for low-noise design of the peak detector of AAC are finally proposedPublished in:Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on (Volume:48 ,  Issue: 6)Page(s):537 - 547ISSN :1057-7130INSPEC Accession Number:7034465DOI:10.1109/82.943325谢谢Date of Publication :Jun 2001Date of Current Version :07 八月 2002Issue Date :Jun 2001Sponsored by :IEEE Circuits and Systems Society

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在求ieee paperA crystal oscillator with automatic amplitude control and digitally controlled pulling range of ±100 ppm

In this paper we report a digitally controlled crystal oscillator (DCXO) at 32.000 MHz. The circuit has an automatic control circuit to ensure that the voltage at the two crystal pins is always above ground, thereby avoiding waveform-clamping by ESD diodes. The stable amplitude keeps the power dissipation in the external crystal well controlled. The circuit also includes a digital tuning scheme to pull the crystal frequency by ±100 ppm around the center frequency with a 0.45 ppm/step resolution.

AuthorsBalan, V. ;


Pan, T.Published in:Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on (Volume:5 )

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