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CMOS RFIC Noise Canceling Method. 2009314086 An Yong- jun. Contents. Noise Cancelling in Wideband CMOS LNAs F. Bruccoleri , E.A.M. Klumperink , B. Nauta . In 2002, ISSCC. Paper Study Flow. Today. Noise Cancelling in Wideband CMOS LNAs - PowerPoint PPT Presentation
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CMOS RFICNoise Canceling Method
2009314086 An Yong-jun
Contents
Noise Cancelling in Wideband CMOS LNAsF. Bruccoleri, E.A.M. Klumperink, B. Nauta. In 2002, ISSCC
Paper Study Flow
Noise Cancelling in Wideband CMOS LNAs
F. Bruccoleri, E.A.M. Klumperink, B. Nauta. In 2002, ISSCC
Today
SameCircuit
Noise Cancelling in Wideband CMOS LNAs
Shunt FeedbackFor input matchingZin = Rs NF>3dBNF always lager than 3dB
Input noise current(ACL-1)times smaller than the others
Noise Cancelling in Wideband CMOS LNAs
Noise Canceling from MOSFET(Not source)
Determine ‘A’
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
Same Opposite
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
Overall Gain :
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
Source FollowerVout = VYout+VXout
VYout = VY
VXout = VX * gm2/gm3
Noise cancelled which is gen-erated by this FET
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
EF : (noise)Excess Factor
Higher gm2Rs Lower F
Less than 1
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
Noise cancelled point!
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
►Robustness
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
►Distortion canceling
Distortion comes from this FET
Distortion canceled like Thermal noise
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
►High Freq. Limit.
Approximately CY=CL=0 1) CY and the load CL don’t affect the can-cellation
2) CL doesn’t affect the F of the LNA standalone
Source Impedance looks like
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
@ High Freq, Noise cancelling is degraded
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
But f0 is higher, - high fT
- Minimizing CIN
- reduce Miller effect
degrades frequency factor
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling
►Conclusion• simultaneous cancellation of noise and distortion terms
due to the matching device;
• simultaneous noise and power matching for frequencies
where the effect of parasitic capacitors can be neglected;
• orthogonality of design parameters for input impedance
and gain, allowing for an easier implementation of variable
gain while maintaining input impedance matching;
• robustness to variations in device parameters and the external
source resistance ;
• applicability in other IC technologies and amplifier
topologies.