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RF CMOS LC -Oscillator With Source Damping Resistors

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4 Author(s)
Seok-Ju Yun ; Inf. & Commun. Univ., Daejeon ; Chong-Yul Cha ; Hyoung-Chul Choi ; Sang-Gug Lee

This letter proposes a new method to suppress the 1/f noise contribution of active devices in an oscillator using source damping resistors. The operational mechanism of the proposed source damping resistor method is analyzed through circuit simulation with a complementary LC-oscillator. The reduced 1/f noise leads to the phase noise improvement by suppressing 1/f noise up-conversion to phase noise. The measurement result shows that there is about 6.0dBc and 4.0dBc of phase noise improvement at 10kHz and 100kHz offset frequency with differential complementary LC-oscillator topology, respectively

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:16 ,  Issue: 9 )