Inductorless Wideband LNA with Improved Input Matching using Feedforward Technique

This paper presents the design of an inductorless wideband LNA for multistandard wireless applications including WiFi, Bluetooth, GSM and WCDMA. The circuit uses a current reuse shunt-shunt feedback architecture with a feedforward path in order to improve the input matching, gain and noise figure (NF) simultaneously. The amplifier has been fabricated in standard 65nm CMOS technology and operates under a 1.2 V supply voltage. The achievable peak gain is 16 dB with a 3 dB bandwidth between 100 MHz and 5 GHz, while the input matching provides a S-11 <= -9 dB between 100 MHz and 10 GHz. The noise figure is kept below 5 dB until the frequency of 9.5 GHz. The linearity of the amplifier gives an input P-1dB and IIP3 of -17 dBm and -6 dBm respectively. The power consumption is only 6.3 mW. The area of the chip occupies only 0.1 mm(2) with pads included.