A low-phase-noise digitally controlled crystal oscillator for DVB TV tuners
نویسندگان
چکیده
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 mm in a 0.18m CMOS process.
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