This paper describes GaAs MMICs used in wireless LANs for spread spectrum communications on the ISM band. Both the transmitter and the receiver are incorporated inside the MMIC. In our experiment using prototypes at a center frequency of 2.45 GHz, the transmitter has a saturation output power of 21.4 dBm and the total current consumption is 131.2 mA. The receiver has a noise figure of3.2 dB and a gain of 12.2 dB.

This paper presents the fabrication and evaluation of a 60 GHz fully integrated MMIC one-chip receiver based on pseudomorphic InGaP/InGaAs/GaAs HEMT technology. The receiver consists of two 2-stage low-noise amplifiers (LNAs), a single-balanced active-gate mixer, a local oscillator (LO), and a buffer amplifier for the LO. The receiver has a conversion gain of greater than 17 dB from 60.2 GHz to 62.3 GHz, and the maximum conversion gain is 20 dB at 62.2 GHz. The noise figure of receiver is less than 6 dB in the IF range between 100 MHz and 1 GHz for a 61.536 GHz LO frequency, and the minimum noise figure is 4.9 dB at 1 GHz IF.