A 2.3-7 GHz CMOS High Gain LNA Using CS-CS Cascode with Coupling C

A fully integrated CMOS wideband Low Noise Amplifier (LNA) operating over 2.3–7 GHz is designed and fabricated using a 0.18 μm CMOS process. The proposed structure is a common sourcecommon source (CS-CS) cascode amplifier with a coupling capacitor. It realizes both low voltage drop at load resistor (Rload) and high gain over 2.3–7 GHz with simultaneous noise and input matching and low power consumption. This paper presents the proposed design technique of a wideband LNA, and verifies its performance by simulation and measurement. This wideband LNA achieves an average gain (S21) of 16.5 (dB), an input return loss (S11) less than −8 dB, a noise figure (NF) of 3.4–6.7 dB, and a third order input interception point (IIP3) of −7.5–3 dBm at 2.3–7 GHz with power consumption of 10.8 mW under 1.8 V VDD. key words: wideband LNA, coupling capacitor, common source-common source cascode