A low-power and wideband two-stage millimeter-wave low-noise amplifier (LNA) for 60 GHz WPAN (wireless personal area network) system and 77 GHz automotive radar system using standard 90 nm CMOS technology is reported. T-match technique is utilized to achieve simultaneously wideband input and output impedance matching, wideband power gain (S21) and wideband NF at both 60-GHz-band and 77-GHz-band. The LNA consumes only 9.99 mW, achieving S11 better than -10 dB for frequencies of 57.6~81.8 GHz, and S12 better than -29.1 dB for frequencies of 10~110 GHz. Additionally, high and flat S21 of 11.2±1.5 dB is achieved for frequencies of 57.9~80.4 GHz, which means the corresponding 3-dB bandwidth is 22.5 GHz. Furthermore, the LNA achieves minimum noise figure (NF) of 4.8 dB at 76 GHz and NF of 6.2±1.4 dB for frequencies of 76~84 GHz, one of the best NF results ever reported for a W-band CMOS LNA. At 79 GHz, the measured input 1 dB compression point (P1dB) and input third-order intercept point (IIP3) are -18.7 dBm and -7.4 dBm, respectively.