Patent ID: 8842769

Claim:
A digital up-conversion system for a concurrent multi-band signal, comprising: a plurality of digital up-converter chains configured to provide digital up-conversion for different ones of a plurality of frequency bands of a concurrent multi-band signal, where each digital up-converter chain of the plurality of digital up-converter chains comprises: one or more complex digital up-converter stages each comprising a complex baseband tuner followed by an up-sampler and an image selection filter, the one or more complex digital up-converter stages configured to: receive a complex baseband digital signal for a corresponding one of the plurality of frequency bands of the concurrent multi-band signal; and process the complex baseband digital signal to provide a complex output signal that comprises an image of the complex baseband digital signal centered at a desired output frequency for the one or more complex digital up-converter stages; and a digital quadrature modulator configured to perform digital quadrature modulation of the complex output signal to provide a digital up-converted signal output by the digital up-converter chain where the digital up-converted signal comprises the image of the complex baseband digital signal at a desired up-conversion frequency for the digital up-converter chain; a digital combiner configured to digitally combine a plurality of up-converted digital signals output from the plurality of digital up-converter chains to provide a combined digital signal; and one or more additional processing components configured to process the combined digital signal to provide the concurrent multi-band signal, the one or more additional processing components comprising a combined up-converter that provides additional up-conversion, a digital-to-analog converter, and a multi-passband radio frequency filter that follows the digital-to-analog converter.