A 3-5 GHz Current-Reuse g(m)-Boosted CG LNA for Ultrawideband in 130 nm CMOS
This paper presents a low-power CMOS transconductance "g(m)" boosted common gate (CG) ultrawideband (UWB) low noise amplifier (LNA) architecture, operating in the 3-5 GHz range, employing current-reuse technique. This proposed UWB CG LNA utilizes a common source (CS) amplifier as the g(m)-boosting stage which shares the bias current with the CG amplifying stage. A detailed mathematical analysis of the LNA is carried out and the different design tradeoffs are analyzed. The LNA circuit was designed and fabricated using the 130-nm IBM CMOS process and it achieved input return loss (S-11) and output return loss (S-22) variations of respectively -8.4 to -40 dB and -14 to -15 dB within the pass-band. The LNA exhibits almost flat forward power gain (S-21) of 13 dB and a reverse isolation S-12 variation of -55 dB to -40 dB, along with a noise figure (NF) ranging between 3.5 and 4.5 dB. The complete circuit (with output buffer) draws only 3.4 mW from a 1 V supply voltage.
current-reuse lna ultrawideband (uwb) cmos noise optimization common gate amplifier g(m)-boosted low noise amplifier (lna)