A 6–21-GHz Wideband Novel Current-Reuse LNA With Simultaneous Noise and Input Matching

This letter describes the design of a 6–21 GHz monolithic microwave integrated circuit (MMIC) low-noise amplifier (LNA) for ultra wideband (UWB) communication systems. At lower power consumption, a higher and flat gain of 23 ± 0.8 dB is achieved through the novel current-reuse configuration. The degeneration inductor and matching network are utilized to realize the simultaneous optimum matching for noise and input. The proposed LNA in
$0.15~\mu \text {m}$
GaAs pHEMT process achieves 1.03–1.76 dB noise figure (NF) and input return loss of more than 13 dB simultaneously. The LNA exhibits output return loss of more than 8 dB and output 1 dB compression point (OP
₁
dB) of 9.5–13.6 dBm, −2.5 to 2 dBm IIP3. The fabricated LNA consumes 135 mW from a 5 V supply and occupies a chip area of
$1.3\times0.8$
mm.