RF CMOS LC-Oscillator With Source Damping Resistors 指導教授 : 林志明 學生 : 劉彥均 Seok-Ju Yun, Chong-Yul Cha, Hyoung-Chul Choi, and Sang-Gug Lee IEEE MICROWAVE AND.

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Presentation transcript:

RF CMOS LC-Oscillator With Source Damping Resistors 指導教授 : 林志明 學生 : 劉彥均 Seok-Ju Yun, Chong-Yul Cha, Hyoung-Chul Choi, and Sang-Gug Lee IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL. 16, NO. 9, SEPTEMBER 2006

Outline 1/f NOISE IN CMOS COMMON- SOURCE TOPOLOGY CMOS LC OSCILLATORS WITH SOURCE DAMPING RESISTORS MEASUREMENT RESULTS CONCLUSION

1/f NOISE IN CMOS COMMON- SOURCE TOPOLOGY CMOS LC OSCILLATORS WITH SOURCE DAMPING RESISTORS MEASUREMENT RESULTS CONCLUSION

Fig. 1. Low frequency output noise voltage ( ) for common source topology with degeneration resistor, R s.

1/f NOISE IN CMOS COMMON- SOURCE TOPOLOGY CMOS LC OSCILLATORS WITH SOURCE DAMPING RESISTORS MEASUREMENT RESULTS CONCLUSION

Fig. 2. CMOS complementary differential LC oscillator with damping resistors.

Fig. 3. Transconductance curve versus V gs with R dmp without R dmp.

Fig. 4. Simulated phase noise at 100-kHz offset and tank voltage swing versus R dmp value.

1/f NOISE IN CMOS COMMON- SOURCE TOPOLOGY CMOS LC OSCILLATORS WITH SOURCE DAMPING RESISTORS MEASUREMENT RESULTS CONCLUSION

Measured phase noise performance for the cases of R dmp = 0Ω and 40Ω of differential (0.18-m CMOS)

Measured phase noise performance for the cases of R dmp = 0Ω and 40Ω of single-ended (0.35-m CMOS)

Conclusion A new source resistor damping method to suppress 1/f noise up-conversion in aCMOS oscillator is proposed. The simulation results show that the amount of 1/f noise can be suppressed substantially using source damping (degeneration) resistors.