CMOS RFIC Noise Canceling Method - PowerPoint PPT Presentation

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CMOS RFIC Noise Canceling Method

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Noise Cancelling in Wideband CMOS LNAs. Shunt Feedback. For input matching. Z. in = R. s NF3dB. NF always lager than 3dB. Input noise current (A. CL-1)times smaller – PowerPoint PPT presentation

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Title: CMOS RFIC Noise Canceling Method


1
CMOS RFIC Noise Canceling Method
  • 2009314086 An Yong-jun

2
Contents
Noise Cancelling in Wideband CMOS LNAs F.
Bruccoleri, E.A.M. Klumperink, B. Nauta. In 2002,
ISSCC
3
Paper Study Flow
Today
  • Noise Cancelling in Wideband CMOS LNAs
  • F. Bruccoleri, E.A.M. Klumperink, B. Nauta. In
    2002, ISSCC

Same Circuit
4
Noise Cancelling in Wideband CMOS LNAs
For input matching Zin Rs ? NFgt3dB NF always
lager than 3dB
Shunt Feedback
Input noise current (ACL-1)times smaller than the
others
5
Noise Cancelling in Wideband CMOS LNAs
Noise Canceling from MOSFET (Not source)
? Determine A
6
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
Same
Opposite
7
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
Overall Gain
8
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
Source Follower
Vout VYoutVXout VYout VY VXout VX gm2/gm3
Noise cancelled which is generated by this FET
9
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
Less than 1
EF (noise)Excess Factor
Higher gm2Rs ? Lower F
10
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
Noise cancelled point!
11
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
12
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
  • Robustness

13
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
  • Distortion canceling

Distortion comes from this FET
Distortion canceled like Thermal noise
14
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
  • High Freq. Limit.

Approximately CYCL0
  1. CY and the load CL dont affect the cancellation
  2. CL doesnt affect the F of the LNA standalone

Source Impedance looks like
15
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
_at_ High Freq, Noise cancelling is degraded
16
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
But f0 is higher, - high fT - Minimizing
CIN - reduce Miller effect degrades frequency
factor
17
Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
18
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.
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