Wide band LNA with BW expansion by capacitive feed forward technique

This paper presents a wide band low noise amplifier (LNA) that utilizes shunt feedback topology (SF). SF based lna suffers from strict trade-off between the input matching reflection coefficient (S\´il) and noise figure NF. To break this trade-off a feed forward (FF) stage is added to achieve two in-phase nodes in the path of the signal where "a negative" Miller capacitance can be obtained by employing another capacitive FF resulting in a partial cancellation of the parasitic capacitance associated with the dominant pole hence expanding the BW of both gain and S\´il while slightly affect the NF. The LNA was realized using 90 nm CMOS technology and achieves gain of 14 dB, S₁₁ <; -10 dB and NF less than 2.2 dB in the frequency range from 0.5-2.2 GHz and less than 2.8 dB in the entire BW of 0.1-5GHz while draws 10 mA from 1.2 V DC source and occupies 0.003 mm².