TY - GEN
T1 - A 2.4-GHz LC-tank VCO with minimum supply pushing regulation technique
AU - Wang, Xuejin
AU - Bakkaloglu, Bertan
PY - 2007
Y1 - 2007
N2 - Design of low drop-out (LDO) supply regulated 2.4GHz low phase noise LC-tank voltage controlled oscillator (VCO) is presented. Low-frequency supply noise sensitivity of the VCO phase noise is derived, and output noise and power supply rejection (PSR) profile of the LDO is optimized for minimum supply pushing. The LDO PSR and output noise is optimized by shaping the LDO AC response and tuning the equivalent-series resistance (ESR) of the bypass capacitor, while achieving maximum LDO current efficiency. To verify the results, two 2.4GHz LC-tank VCOs, with a PMOS and an NMOS switching pair respectively with associated PMOS supply regulators are designed and fabricated in a 0.18μm, 7-layer metal CMOS process. The implemented VCOs achieve less than 95dBcZHz phase noise at 100kHz offset with a current consumption of 2.2mA. By utilizing the proposed regulator AC loop shaping, the VCO phase noise sensitivity to supply noise is improved by 30dB for offset frequency up to 10MHz with no Phase noise peaking.
AB - Design of low drop-out (LDO) supply regulated 2.4GHz low phase noise LC-tank voltage controlled oscillator (VCO) is presented. Low-frequency supply noise sensitivity of the VCO phase noise is derived, and output noise and power supply rejection (PSR) profile of the LDO is optimized for minimum supply pushing. The LDO PSR and output noise is optimized by shaping the LDO AC response and tuning the equivalent-series resistance (ESR) of the bypass capacitor, while achieving maximum LDO current efficiency. To verify the results, two 2.4GHz LC-tank VCOs, with a PMOS and an NMOS switching pair respectively with associated PMOS supply regulators are designed and fabricated in a 0.18μm, 7-layer metal CMOS process. The implemented VCOs achieve less than 95dBcZHz phase noise at 100kHz offset with a current consumption of 2.2mA. By utilizing the proposed regulator AC loop shaping, the VCO phase noise sensitivity to supply noise is improved by 30dB for offset frequency up to 10MHz with no Phase noise peaking.
KW - DC-DC power conversion
KW - Low-dropout regulators
KW - Phase noise
KW - Power supply rejection
KW - Voltage controlled oscillators
UR - http://www.scopus.com/inward/record.url?scp=34748848019&partnerID=8YFLogxK
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U2 - 10.1109/RFIC.2007.380848
DO - 10.1109/RFIC.2007.380848
M3 - Conference contribution
AN - SCOPUS:34748848019
SN - 1424405319
SN - 9781424405312
T3 - Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
SP - 127
EP - 130
BT - Proceedings of the 2007 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2007
T2 - 2007 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2007
Y2 - 3 June 2007 through 5 June 2007
ER -