1. Final Project in RFCS in the MINT Program of the UPC by Sven Günther
A 90-nm Wideband Merged CMOS LNA and Mixer Exploiting Noise Cancellation
Final Project in RFCS in the MINT Program of the UPC by Sven Günther

2. Scope Introduction Wideband LNA LNA Core and Noise Analysis
Final LNA Topology
Merged LNA and Mixer
Measurement and Simulation Results
Conclusion
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3. 1. Introduction Why do we need wideband RF receivers?
Many number of wireless LAN standards in different frequency bands
Use for Software Defined Radio (SDR) with single flexible receiver
Less power consumption and chip area
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4. 2. Wideband LNA Topologies Common-gate LNA Resistive feedback LNA
Distributed amplifier LNA
Inductive source-degeneration common-source LNA (resistive feed back/LC-bandpass at the input)
Common-gate LNA
Noise Figure: F = 1 + γ/α
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5. 3. LNA Core and Noise Analysis
Cascode structure
Input impedance
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6. 3. LNA Core and Noise Analysis
Assumption that Thermal Noise is Main Noise Source
Input Power Matching Condition:
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7. 3. LNA Core and Noise Analysis
Noise Factor
Optimum Noise Factor for
For Rin=100 Ω, Rs=50 Ω, gm1=28.28 mS, gm3=8.28
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8. 4. Final LNA Topology M3 and M4 pMOS due to less Vth
M5 to M8 inductively degenerated for Output Current Noise Reduction
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9. 5. Merged LNA and Mixer Less transistors in signal path
Lower non-linearities
Less power consumption
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10. 5. Merged LNA and Mixer Final Noise Factor
For the design with I=0.7 mA, RL=350 Ω, A=0.25 mV (amplitude of single-ended LO signal)
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11. 6. Measurement and Simulation Results
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12. 7. Conclusion Merged LNA and Mixer realized in 90 nm CMOS Compact Size
Low Power Consumption
Suitable for multiband operation
Power Gain
12.1 dB
Voltage Gain
20 dB
RF Frequency
0.1 ~ 3.85 GHz
IF Freqeuncy
70 MHz
NFSSB,min
8.4 dB (fRF=2.1 GHz)
NFSSB,max
11.5 dB (fRF=0.1, 3.85 GHz)
S11
< -10 dB
1dB CP (Input Ref.)
dBm (fRF=2.3 GHz)
IDD at VDD (Core)
8.15 mA at 1.2 V
Area
0.88 mm2
Technology
90 nm CMOS
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13. Thank you for your Attention!
Any Questions?
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14. Bibliography
[1] A. Amer, E. Hegazi, and H. F. Ragaie, “A 90-nm Wideband Merged CMOS LNA and Mixer Exploiting Noise Cancellation,” IEEE J. Solid-State Circuits, vol. 42, no. 2, pp , Feb 2007.
[2] H. Sjöland, A. Sanjaani, and A. Abidi, “A merged CMOS LNA and mixer for a WCDMA receiver,” IEEE J. Solid- State Circuits, vol. 38, no. 6, pp. 1045–1050, Jun 2003.
[3] H. Darabi and A. Abidi, “Noise in RF-CMOS mixers: A simple physical model,” IEEE J. Solid-State Circuits, vol. 35, no. 1, pp. 15–25, Jan
[4] M. Kawashima, H. Hayashi, T. Nakagawa, K. Nishikawa, and K. Araki, “A GHz broadband RF front-end for direct conversion transceivers,” in IEEE MTT-S 2002 Int. Microwave Symp. Dig., pp. 927–930.
[5] V. J. Arkesteijn, E. A. M. Klumperink, and B. Nauta, “A wideband high-linearity RF receiver front-end in CMOS,” in Proc. ESSCIRC, 2004, pp. 71–74.
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