Analysis and Design of Single-ended Inductively- degenerated Interstage Matched Common-source Cascode CMOS LNA

The LNA is implemented using 90nm CMOS technology. The cascode topology with single-ended source degeneration using inductor is employed. The high gain is achieved by using common-source (CS) amplifier. A different input matching as well as output matching topology may improve the efficiency and minimize noise of the LNA. An inductance network (Lg, Ls) is used for input matching. An interstage inductor between the common source stage and common gate stage is used to increase the overall gain. The amplifier operates at 2.4 GHz with an input return loss better than -15 dB. The LNA will have high isolation with voltage gain> 15 dB, NF< 4dB, S21> 20dB and IIP3> −10dBm. The LNA consumes current< 14 mA from a near about 1.2-V supply. The detailed analysis of the proposed LNA will be presented. Experimental measurements explain a correct operation of the circuits, tuning of Noise Figure (NF), IIP3 and S-parameters. To our knowledge, this is the first architecture that provides all these particulars. This LNA finds its application at Portable GPS Receiver, BLE (Bluetooth Low Energy), Zigbee, NFC, WiFi, Wireless Sensor Network, RFIC operating at 2.4GHz frequency. Index Terms : Inductively-degenerated, Common-source cascode Low Noise Amplifier (LNA), Interstage match, Figure of Merit (FoM), Input referred third-order intercept point (IIP3), S-parameter.