GaAs Monolithic Direct Linear (1 - 2.8) GHz Q.P.S.K. Modulator

Monolithic 1-2.8 GHz linear "Quaternary phase Shift Keying" modulators have been designed and fabricated with the standard D07A process of the PHILIPS MICROWAVE GaAs MMIC Foundry. Output power of the modulator is a dBm with third order intermodulation signals more than 41 dBc. Carrier rejection and Band rejection of more than 45 dBc have been measured corresponding to a maximum amplitude and phase error of less than 0.12 dB and 0.8° respectively.