Design and Analysis of a Novel Noise Cancelling Topology for Common Gate UWB LNAs - VLSI Design and Test - page 176

Table 1. UWB LNA Performance Comparison

With Noise Cancellation Without Noise Cancellation

Frequency (GHz) 2.4 ~ 9.0 3.1 ~ 10.6

S11 (dB) < - 10 < - 10

S21 (dB) 24.24 (average) 17.70 (average)

NF (dB) 3.16 4.09

Technology 0.18 µm CMOS 0.18 µm CMOS

5 Conclusion

A noise cancelling topology for CG UWB LNA in 2.4-9 GHz range has been demon-
strated in a standard TSMC 0.18 µm CMOSRF technology and analysis of all noise
contributing sources is performed. Significant reduction (33.17%) in noise figure
approximately 1 dB less is obtained with the proposed topology when compared to
LNA without noise cancelling technique. Higher and flat power gain of 24.24 dB
(average) and NF of 3.16 dB is achieved over the 6600 MHz UWB spectrum.

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