Abstract: Ultra- small size transmit/ receive module is reported with regard to active phased arrays by the application of GaAs MMIC technique. This makes possible the production of Quad TRMs, while satisfying the basic requirements for transmit/ receive modules- wide band, high output power, low noise figure, small size and weight and low cost and sufficient gain in both transmit and receive. This paper focuses on the control of one such X-band QTRM using FPGA.