A C-band direct demodulation MMIC receiver for digital communications systems

The feasibility of a microwave direct demodulation receiver has been demonstrated for radio link equipments in hybrid technology [1]. In that case there is no intermediate frequency, so this structure is easier to integrate on GaAs substrate. Having all the elementary functions on the same chip can even lead to a new topology for the MMIC receiver. Integration interest are a better demodulation performance because of the symmetry of the MMIC circuits and a large useful frequency range which covers several telecommunication bands between 6.4 GHz and 8.5 GHz. The monolithic designs and realizations of a C-Band direct demodulation MMIC receiver for digital communications systems will be described here. Results are presented for the different circuits which have been independently designed (figure n° 1).