A 0.1–4.2 GHz, 960-μW Inductor-Less and Negative Shunt Feedback LNA With Simultaneous Noise and Distortion Cancellation and Bandwidth Extension

This paper presents an inductor-less, low-power, wideband, and noise-cancelling low-noise amplifier (LNA) for simultaneous deployment in low-power and multi-standard applications. The main novelty of this work lies in the concurrent utilization of the feedforward and feedback techniques to achieve simultaneous noise and distortion cancellation of input CG stage and bandwidth extension while maintaining low-power input matching, respectively. The proposed LNA is analyzed using the two-port network theory, thereby highly simplifying the extraction of device parameters and evaluating optimum design conditions. The proposed LNA is fabricated in a standard 65-nm CMOS process and occupies a core area of only 0.011-mm <tex-math notation="LaTeX">²</tex-math> while consuming 960- <tex-math notation="LaTeX">μ</tex-math> W of dc power from a 0.78-V supply. The peak <tex-math notation="LaTeX">S₂₁</tex-math> of LNA is 15.6 dB with a higher cut-off bandwidth ( <tex-math notation="LaTeX">BW-3dB</tex-math> ) of 4.2 GHz. The minimum NF of LNA is 4.45 dB at 2 GHz, while the measured IIP <tex-math notation="LaTeX">₃</tex-math> of the LNA is -16 dBm at the same frequency. Based on the measured data, the proposed LNA provides the widest bandwidth among the works reported in the low-power, inductor-less regime along with one of the highest FOM <tex-math notation="LaTeX">I</tex-math> and a competitive FOM <tex-math notation="LaTeX">II</tex-math> .