Design of high gain high output matched narrow band LNA using induced degeneration topology for receiver applications

Design of a receiver includes a Low Noise Amplifier (LNA) for astronomical radio applications. Conventionally radio telescopes are used as receivers, and antennas like a yagi antenna and orthomode transducer antenna are used to observe signals. The main aspect of LNA is to achieve sufficient Noise Figure (NF) and maximum gain at real-time applications. Previous LNA such as folded cascode LNA, Multigain LNA and multimode LNA are introduced to perform low noise amplification at the receiver side of antenna array systems. Narrowband inducer degenerated cascaded LNA design is presented in this paper. This design initially analyzed a high gain of up to 20 dB, and input matching values are found to be up to − 25db and a high reverse isolation coefficient was measured. After performing S-parameter analysis, the values are plotted in a smith chart to find the system’s stability and gain circles are plotted. The noise figure was measured and was minimized due to its inductor degeneration topology adopted in this LNA design that limits noise performance and increases gain. Proposed LNA was then evaluated with a voltage gain, power gain, and noise figure and output impedance. Evaluated values are then compared with previous methods so as to show that the proposed design has overwhelmed conventional techniques. Output load value is selected optimum as it creates an impact on the stability of LNA. The induced degeneration technique implemented in LNA design helps to increase the gain by boosting the signal input, and hence in turn, it increases overall gain performance. Similarly, while executing Narrowband inducer degenerated cascaded LNA design in CADENCE software, this LNA exhibits a minimum NF of $$2\;{\text{dB}}\; {\text{at}}\; 90\;{\text{ GHz}}$$ 2 dB at 90 GHz and power gain of $$16\;{\text{dB}}\; {\text{at}}\; 90\; {\text{GHz}}$$ 16 dB at 90 GHz in measurement. Thus proposed LNA design performs well for radio receiver applications.