Abstract:This paper presents a 0.009 to 1.4 GHz frequency synthesizer that is able to compensate for changes in frequency tuning range due to temperature variations by switching VCO bands with minimal phase and frequency errors, without cycle slipping and without introducing any phase offsets. This is accomplished by a sub-threshold capacitor bank switching circuit that causes the gradual addition of capacitance slowly enough to allow the loop to adjust the VCO control voltage to compensate. The additional circuitry us… Show more
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