This paper presents two fully integrated binary phase-shift keying (BPSK) and quadrature phase-shift keying (QPSK) transceivers operating at W-band [carrier frequency = 84 GHz (BPSK), and 87 GHz (QPSK)]. Including RF front-end, Costas-loop-based carrier and data recovery, and antenna assembly technique, the BPSK transceiver prototype achieves a 2.5-Gb/s data link with BER