2002 · 28 citations · 6 references
EngineeringElectrical EngineeringAnalog ElectronicsMicroelectronicsVlsi DesignCmos Circuit DesignIntegrated Circuit DesignLow-noise Circuit DesignMixed-signal Integrated Circuit DesignMixed-signal IntegrationRadio-frequency Integrated CircuitsCmos OscillatorsDividersFrequency SynthesisFrequency SynthesizersLinearizationLow-phase-noise OscillatorsPhase NoiseSettling Time
This design integrates a 4/sup th/ order type-2 charge-pump PLL frequency synthesizer for the DCS-1800 system in a standard 0.4 /spl mu/m CMOS process without external components. The VCO uses an integrated hollow planar inductor, formed in the 2 metal levels available on a lowly-doped substrate. The coil has a symmetrical octagonal shape and size optimized using 2-D circular finite-element analysis. Skin effect and eddy current losses are minimized, and the quality factor is 8.6. VCO phase noise is -122.5 dBc/Hz at 600 kHz offset and tuning range is 20%.
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