DACS/FPGAS BUILD HIGH DIRECT If

摘要

Key system performance improvements come about from enabling high direct-IF architectures over more traditional direct modulation techniques, while delivering improved performance over wider bandwidths. Dynamic performance is always a vital factor. But with demand for wide generated bandwidths still focused on 100MHz, conversion rates that support the 60MHz UMTS band, along with digital pre-distortion play an equally important role. Existing basestation systems typically use lower performance, dual DAC devices generating I . and Q signals to drive an external analogue quadrature modulator.