ISCC2014 presentation 1 - Stanford Universityweb.stanford.edu › group › poongroup › cgi-bin...
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7/8/14 1 Mazhareddin Taghivand, Kamal Aggarwal and Ada Poon Dept. of Electrical Engineering Stanford University 21.5: A 3.24to8.45GHz LowPhaseNoise ModeSwitching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 2 of 25 Outline • Motivation • Design Challenges • Design of Mode-Switching VCO • Measurement Results • Conclusion
Transcript of ISCC2014 presentation 1 - Stanford Universityweb.stanford.edu › group › poongroup › cgi-bin...
7/8/14
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Mazhareddin Taghivand, Kamal Aggarwal and Ada Poon
Dept. of Electrical Engineering Stanford University
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 2 of 25
Outline
• Motivation
• Design Challenges
• Design of Mode-Switching VCO
• Measurement Results
• Conclusion
7/8/14
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Motivation
• Cellular/WiFi frequencies from 400-to-5900MHz
• Multiple VCOs are used for multi-band x Area increases x Muxing of VCO outputs
• Need to meet stringent PN requirements – One-turn inductor is needed ! large area – Coupling multiple VCOs ! high power & area
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 3 of 25
Motivation
• Cellular/WiFi frequencies from 400-to-5900MHz
• Multiple VCOs are used for multi-band x Area increases x Muxing of VCO outputs
• Need to meet stringent PN requirements – One-turn inductor is needed ! large area – Coupling multiple VCOs ! high power & area
• Desirable to have one VCO with ! Low PN ! Wide tuning range
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 4 of 25
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21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 5 of 25
Outline
• Motivation
• Design Challenges
• Design of Mode-Switching VCO
• Measurement Results
• Conclusion
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 6 of 25
• Best PN from Leeson’s eq. – Maximize voltage swing ! reliability limit – Maximize Q of the LC tank – Increase Capacitance ! Reduce Inductance
Low PN VCO Design
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21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 7 of 25
• Inductance & Q increase with area
Small Inductance Challenge
Q
L
Desired Q Desired L
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 8 of 25
Outline
• Motivation
• Design Challenges
• Design of Mode-Switching VCO
• Measurement Results
• Conclusion
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21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 9 of 25
High Q & Small Inductance
570pH
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 10 of 25
High Q & Small Inductance
570pH 288pH
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21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 11 of 25
High Q & Small Inductance
570pH 288pH 181pH
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 12 of 25
Mode Switching Inductor
288pH
Common mode voltage
No loss in switches
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21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 13 of 25
Mode Switching Inductor
288pH
Common mode voltage
No loss in switches
Common mode voltage
No loss in switches
181pH
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 14 of 25
Mode Switching Capacitor
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21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 15 of 25
Mode Switching VCO
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 16 of 25
Outline
• Motivation
• Design Challenges
• Design of Mode-Switching VCO
• Measurement Results
• Conclusion
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21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 17 of 25
Frequency Range
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 18 of 25
Measured Phase Noise
-144.4dBc/Hz @ 10MHz!7.76GHz -150.2dBc/Hz @ 10MHz!3.72GHz
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21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 19 of 25
Measured PN @ 0.8V
VCO Frequency (GHz)
PN (d
Bc/H
z)
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 20 of 25
Figure of Merit
VCO Frequency (GHz)
FOM
(dB
/Hz)
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21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 21 of 25
Die Photo
657µm
657µ
m
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 22 of 25
Outline
• Motivation
• Design Challenges
• Design of Mode-Switching VCO
• Measurement Results
• Conclusion
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23 of 25
Table of Comparison This Work ISSCC.
2012
JSSCC
June 2012
CICC
2009
Frequency (GHz) 3.24 – 8.45 (88.7 %)
6.72 – 9.2 (31%)
2.48 – 5.62 (77.5%)
3.28-8.35 (87.2%)
Core Voltage (V) 0.8 1.5 0.6 1.6 Core Power (mW) 20 27 9.8 - 14.2 6.5 - 15.4
Carrier (GHz) 3.72 7.76 3.72 3.72 3.72 PN (dBc/Hz)
@ 100 KHz offset -105.56 -95.25 -104 -96 -95
FoMT(dB/Hz) @ 100 KHz offset
202.92 199.05 191 195 197
PN (dBc/Hz) @ 10 MHz offset
-150.22 -144.45 -151 -151.4 -141
FoMT(dB/Hz) @ 10MHz offset
207.58 208.25 198 210 203
Technology 40nm CMOS 55nm CMOS 65nmCMOS 130nm CMOS
21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 24 of 25
• Dual-band mode switching oscillator demonstrated
• Wide tuning range of 3.24GHz to 8.45GHz
• Low PN of −144.4dBc/Hz @ 10MHz offset of 7.76 GHz
• High FoMT of 208.2dB/Hz @ 10MHz offset for 7.76 GHz
Conclusions
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21.5: A 3.24-‐to-‐8.45GHz Low-‐Phase-‐Noise Mode-‐Switching Oscillator ©2014 IEEE InternaGonal Solid State Circuits Conference 25 of 25
Acknowledgement
• TSMC University Shuttle Program
• Lorentz Solution for the EM tool
• Denny Goetz for help with testing
