Highly linear low-noise amplifiers

Details Highly linear low-noise amplifiers Highly linear low-noise amplifiers

2007-05-10

2009-06-30

Pascal, Robert (Department: 2817)

Amplifiers

Hum or noise or distortion bucking introduced into signal...

C455S114300

Reexamination Certificate

active

07554397

ABSTRACT:
A predistortion method for CMOS Low-Noise-Amplifiers (LNAs) to be used in Broadband Wireless applications is presented. The method is based on the nulling of the third order Intermodulation distortion (IMD3) of the main amplifier by a highly nonlinear predistortion branch. Maximum third order product cancellation is ensured by a transformer feedback method. The technique improves linearity in a wide range of input power without significant gain and Noise Figure (NF) degradation. Simulation results on a 1-V LNA indicate a 10.3 dB improvement in the Input Third-Order Intercept Point (IIP3) with a reduction of only 1 dB and 0.44 dB in amplifier gain and NF respectively.

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