Wideband vector modulator which combines outputs of a plurality of QPSK modulators

摘要: A vector modulator that sums outputs of a plurality quadrature-phase-shift-key (QPSK) elements, each controlled by two digital input signals and single local oscillator. The oscillator provides periodic sinusoidal output signal, the elements process signal signals. state respective determines which four phase states are present at QPSK modulator. summing devices coupled to one device an analog constellation attenuators provided for amplitude weighting from elements. summed under control their convert into shifted, periodic, comprising signal. In second embodiment, power divider is between combiner used combine derived may be GaAs microwave monolithic integrated circuit includes 90° coupler followed first amplifiers respectively receiving amplifying oscillator, data I Q provide amplified First mixers multiplying with generating modulated element.