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In this work, direct injection locking is applied to a ring oscillator topology to design a wideband divide-by-two frequency divider circuit with a locking range covering bands S through Ku, namely input frequencies from 2 to 16 GHz. A thorough analysis is carried out: a behavioral model is developed that allows us to capture the operation of the two-stage differential ring oscillator. The mixing...
A GSM-compliant local oscillator consuming a tiny die area of only 0.059 mm2 and drawing 9 mA from a 1.2 V supply has been designed in a 65-nm CMOS process using thin-oxide devices only. The system is made of a 13 to 15 GHz LC VCO followed by a divide-by-four injection-locked frequency divider. The divider employs a ring oscillator-based topology leading to a two octave locking range with limited...
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