Print Email Facebook Twitter A Supply Pushing Reduction Technique for LC Oscillators Based on Ripple Replication and Cancellation Title A Supply Pushing Reduction Technique for LC Oscillators Based on Ripple Replication and Cancellation Author Chen, Y. (TU Delft Electronics) Liu, Yao-Hong (Holst Centre) Zong, Z. (TU Delft Electronics) Dijkhuis, Johan (Holst Centre) Dolmans, Guido (Holst Centre) Staszewski, R.B. (University College Dublin) Babaie, M. (TU Delft Electronics) Date 2019 Abstract In this paper, we propose a method to suppress supply pushing of an LC oscillator such that it may directly operate from a switched-mode dc-dc converter generating fairly large ripples. A ripple replication block (RRB) generates an amplified ripple replica at the gate terminal of the tail current source to stabilize the oscillator's tail current and thus its oscillating amplitude. The parasitic capacitance of the active devices and correspondingly the oscillation frequency are stabilized in turn. A calibration loop is also integrated on-chip to automatically set the optimum replication gain that minimizes the variation of the oscillation amplitude. A 4.9-5.6-GHz oscillator is realized in 40-nm CMOS and occupies 0.23 mm² while consuming 0.8-1.3 mW across the tuning range (TR). The supply pushing is improved to <1 MHz/V resulting in a low <-49-dBc spur due to 0.5-12-MHz sinusoidal supply ripples as large as 50 mVpp. We experimentally verify the effectiveness of the proposed technique also in face of saw-tooth, multi-tone, and modulated supply ripples. Subject Common-mode resonancecurrent-biased oscillatordc-dc converterdigitally controlled oscillator (DCO)foreground calibrationFrequency conversionLC oscillatorLC oscillatorspower supply rejection (PSR)ripple replication and cancellationsupply pushingvoltage-controlled oscillator (VCO).ommon-mode resonancevoltage-controlled oscillator (VCO) To reference this document use: http://resolver.tudelft.nl/uuid:f3301dad-e141-41b7-ad32-de74e9dab490 DOI https://doi.org/10.1109/JSSC.2018.2871195 ISSN 0018-9200 Source IEEE Journal of Solid State Circuits, 54 (1), 240-252 Part of collection Institutional Repository Document type journal article Rights © 2019 Y. Chen, Yao-Hong Liu, Z. Zong, Johan Dijkhuis, Guido Dolmans, R.B. Staszewski, M. Babaie Files PDF 08486740.pdf 5.92 MB Close viewer /islandora/object/uuid:f3301dad-e141-41b7-ad32-de74e9dab490/datastream/OBJ/view