Single-Voltage-Supply pHEMT/mHEMT 2.4 and 5.8 GHz LNAs Using Power Constrained Design

2.4-GHz and 5.8-GHz single-voltage-supply LNAs using depletion-mode pHEMT and mHEMT technologies are demonstrated in this paper. Both pHEMT and mHEMT inductively source-degenerated LNAs with a common-drain output stage are designed around 2.4-GHz and 5.8-GHz for a single-band application. The current consumption of 11 mA at3 V supply voltage is intentionally designed for all of the LNAs to make a performance comparison. At 2.4-GHz, the 2.4-GHz pHEMT LNA has 19 dB gain and NF=1.64dB while the 2.4-GHz mHEMT LNA has 19 dB gain and NF=1.18dB. At 5.8-GHz, the 5.8-GHz pHEMT LNA has 16 dB gain and NF=1.93dB while the 5.8-GHz mHEMT LNA has 19 dB gain and NF=1.87dB. The experimental results imply that LNAs with mHEMT technology have better noise and gain performance than those with pHEMT technology.