A Noise Reduction Improvement Technique for a Differential Cascode LNA

A typical common source cascode low-noise amplifier (CS-LNA) can be treated as a CS-CG two stage amplifier. In the published literature, an inductor is added at the drain of the main transistor to reduce the noise contribution of the cascode transistors. In this work, an inductor connected at the gate of the cascode transistor and capacitive cross-coupling are strategically combined to reduce the noise and the nonlinearity influences of the cascode transistors in a differential cascode CS-LNA. It uses a smaller noise reduction inductor compared with the conventional inductor based technique. It can reduce the noise, improve the linearity and also increase the voltage gain of the LNA. The proposed technique is theoretically formulated. Furthermore, as a proof of concept, a 2.4 GHz inductively degenerated CS-LNA was fabricated using TSMC 0.18 m CMOS technology. The resulting LNA achieves 1.92 dB noise-figures with the core fully differential LNA at 1.8 V power supply