Title: CMOS RFIC Noise Canceling Method
1CMOS RFICNoise Canceling Method
2Contents
Noise Cancelling in Wideband CMOS LNAs F.
Bruccoleri, E.A.M. Klumperink, B. Nauta. In 2002,
ISSCC
3Paper Study Flow
Today
- Noise Cancelling in Wideband CMOS LNAs
- F. Bruccoleri, E.A.M. Klumperink, B. Nauta. In
2002, ISSCC
Same Circuit
4Noise 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
5Noise Cancelling in Wideband CMOS LNAs
Noise Canceling from MOSFET (Not source)
? Determine A
6Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
Same
Opposite
7Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
Overall Gain
8Wide-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
9Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
Less than 1
EF (noise)Excess Factor
Higher gm2Rs ? Lower F
10Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
Noise cancelled point!
11Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
12Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
13Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
Distortion comes from this FET
Distortion canceled like Thermal noise
14Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
Approximately CYCL0
- CY and the load CL dont affect the cancellation
- CL doesnt affect the F of the LNA standalone
Source Impedance looks like
15Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
_at_ High Freq, Noise cancelling is degraded
16Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
But f0 is higher, - high fT - Minimizing
CIN - reduce Miller effect degrades frequency
factor
17Wide-Band CMOS Low-Noise Amplifier Exploiting
Thermal Noise Canceling
18Wide-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.