2005 · 24 citations · 5 references
EngineeringElectrical EngineeringMaterials ScienceElectronic MaterialsSemiconductor DevicesThin FilmsDielectricsHigh-frequency Semiconductor DevicesOscillatorsRadio-frequency Integrated CircuitsThin Film Electrical PropertiesVoltage RegulatorsBarium TitanateCapacitorsField-dependent PermittivityGainPermittivityTunable OscillatorsTuning RangeVoltage-controlled Oscillators
Barium strontium titanate (BST) has a field-dependent permittivity and can be used as a dielectric in voltage tunable capacitors or varactors. These BST-based varactors are passive devices and have significantly different properties compared to semiconductor varactors. A voltage tunable oscillator using a BST thin film varactor was designed and characterized. The frequency of oscillation varied from 34.8 MHz to 44.5 MHz (28% tuning) upon application of 7 V tuning voltage. The VCO gain was 1.38 MHz/V and the 2nd harmonic was over 23 dB below the fundamental throughout the tuning range.
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