Print Email Facebook Twitter A 1/f Noise Upconversion Reduction Technique for Voltage-Biased RF CMOS Oscillators Title A 1/f Noise Upconversion Reduction Technique for Voltage-Biased RF CMOS Oscillators Author Shahmohammadi, M. (TU Delft Electronic Components, Technology and Materials) Babaie, M. (TU Delft Electronics) Staszewski, R.B. (TU Delft Electronics; University College Dublin) Date 2016 Abstract In this paper, we propose a method to reduce a flicker (1/f) noise upconversion in voltage-biased RF oscillators. Excited by a harmonically rich tank current, a typical oscillation voltage waveform is observed to have asymmetric rise and fall times due to even-order current harmonics flowing into the capacitive part, as it presents the lowest impedance path. The asymmetric oscillation waveform results in an effective impulse sensitivity function of a nonzero dc value, which facilitates the 1/f noise upconversion into the oscillator's 1/f3 phase noise. We demonstrate that if the ω0 tank exhibits an auxiliary resonance at 2 ω0, thereby forcing this current harmonic to flow into the equivalent resistance of the 2 ω0 resonance, then the oscillation waveform would be symmetric and the flicker noise upconversion would be largely suppressed. The auxiliary resonance is realized at no extra silicon area in both inductor-and transformer-based tanks by exploiting different behaviors of inductors and transformers in differential-and common-mode excitations. These tanks are ultimately employed in designing modified class-D and class-F oscillators in 40 nm CMOS technology. They exhibit an average flicker noise corner of less than 100 kHz. Subject Class-D oscillatorclass-F oscillatordigitally controlled oscillatorflicker noiseflicker noise upconversionimpulse sensitivity function (ISF)phase noise (PN)voltage-biased RF oscillator To reference this document use: http://resolver.tudelft.nl/uuid:d5f67389-f00e-4cf9-852a-86301498ce8b DOI https://doi.org/10.1109/JSSC.2016.2602214 ISSN 0018-9200 Source IEEE Journal of Solid State Circuits, 51 (11), 2610-2624 Part of collection Institutional Repository Document type journal article Rights © 2016 M. Shahmohammadi, M. Babaie, R.B. Staszewski Files PDF 07571191.pdf 11.61 MB Close viewer /islandora/object/uuid:d5f67389-f00e-4cf9-852a-86301498ce8b/datastream/OBJ/view