Wideband Input Matching CMOS Low-Noise Amplifier with Noise and Distortion Cancellation

Abstract

In this paper, a wideband low-noise amplifier (LNA) is designed based on the resistive feedback topology with a TSMC 0.18[Formula: see text][Formula: see text]m standard RF CMOS process. Bandwidth expansion is provided by the second-order Chebyshev filter. The noise figure (NF) increases at high frequency because of the source parasitic capacitors of the cascode transistor; so, noise cancelling technique is applied to the cascode transistor of the proposed LNA. Bias conditions and sizes of the transistors are optimized to cancel the nonlinear transconductance ([Formula: see text]). With this modified technique, low noise figure, high linearity and improved input and output matching can be attained for 3.1–10.6[Formula: see text]GHz frequency band. Post-layout simulation result of the proposed LNA shows the maximum power gain of 17[Formula: see text]dB at 5.5[Formula: see text]GHz frequency, NF of lower than 4.5[Formula: see text]dB over the whole band of 3.1–10.6[Formula: see text]GHz, maximum IIP2 of [Formula: see text]28[Formula: see text]dBm and IIP3 of [Formula: see text]7.5[Formula: see text]dBm, while dissipating 9[Formula: see text]mW (with buffer) from a 1.8 V supply voltage. It occupies [Formula: see text]m silicon die area.