Wide-Band Inductorless and Capacitorless LNTA Based on Cascode Inverters

A wideband LNTA based on cascode inverters is presented, suitable for 5G Sub-6GHz applications. Cascode technique improves the bandwidth, reverse isolation and output impedance. Noise canceling(NC) technology and the new derivative superposition method are adopted to achieve better noise and linearity, respectively. Intrinsic second-order input impedance and off-chip L-type and T-type matching networks are utilized to increase the S11 bandwidth. The use of MOSFETs with different threshold voltages(Vth) simplifies the bias circuit. The first stage of the LNTA is a shunt-shunt feedback LNA, where the feedback resistance R f affects the four key performances of gain, bandwidth, noise and linearity. By adjusting the value of R f , the LNTA can work either in low noise(NF mode) or high linearity(IIP3 mode). The LNTA is designed under the TSMC40nmLP process, and the post-layout simulation shows that the noise figure(NF) can be as low as 1. 52dB under the NF mode. The IIP3 and PldB can reach 10. 58dBm and -1.46dBm respectively under the IIP3 mode. The overall power consumption is only 15. 49mW. The chip core has no inductors and capacitors, making its area only 0.0026mm ² .