A low-phase-noise digitally controlled crystal oscillator for DVB TV tuners |
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Authors: | Zhao Wei Lu Lei Tang Zhangwen |
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Affiliation: | State Key Laboratory of ASIC & System,Fudan University,Shanghai 201203,China |
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Abstract: | This paper presents a 25-MHz fully-integrated digitally controlled crystal oscillator(DCXO)with automatic amplitude control(AAC).The DCXO is based on Colpitts topology for one-pin solution.The AAC circuit is introduced to optimize the phase noise performance.The automatic frequency control is realized by a 10-bit thermometer-code segmental tapered MOS capacitor array,ensuring a~35 ppm tuning range and~0.04 ppm frequency step.The measured phase noise results are-139 dBc/Hz at 1 kHz and-151 dBc/Hz at 10 kHz frequency offset,respectively.The chip consumes 1 mA at 1.8V supply and occupies 0.4 mm2 in a 0.18-μm CMOS process. |
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Keywords: | crystal oscillator DCXO phase noise supply pushing VCTCXO VCXO |
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