2005 · 11 citations · 7 references
EngineeringCommunicationElectrical EngineeringAnalog ElectronicsMicroelectronicsWireless CommunicationsAnalog Integrated CircuitsCmos Circuit DesignMixed-signal Integrated Circuit DesignMobile CommunicationOscillatorsRadio-frequency Integrated CircuitsCmos Analog Circuit DesignCmos Analog Integrated CircuitsCmos OscillatorsCmos Radio-frequency CircuitsPhase NoiseRadio-frequency Integrated Circuit DesignRf Cmos DesignTransistor-based Oscillators
A first digitally-controlled oscillator for mobile stations is presented. Combining a MTM capacitor and two NMOS transistor arrays for the varactor as an RF DAC, a highly linear oscillator gain is achieved, and is insensitive to process shift. With a sigma-delta dithering, a fine frequency resolution is obtained while having negligible phase noise degradation. The measured -167dBc/Hz at 20MHz offset from 915MHz carrier proves that this DCO system can be used in a SAWless transmitter for mobile phones.
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All-digital PLL and GSM/edge transmitter in 90nm CMOS
Robert Bogdan Staszewski, J. Wallberg, S. Rezeq et al. · 2005 · 144 citations