Signal Processing Systems and Signal Processing Methods

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This invention relates to advanced signal processing systems and methods that utilize multiple digital-to-analog converters (DACs) and an IQ mixer to split and process different frequency portions of a digital signal in parallel. By separating lower and higher frequency bands (including their real and imaginary components) and converting them with multiple DACs, which are then recombined, the system effectively increases the achievable bandwidth, data rate, and signal quality compared to using a single DAC. The approach incorporates digital pre-equalization and adaptive calibration to compensate for cross-talk and system imperfections, resulting in improved analog output signal quality crucial for high-speed communication systems.

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• High-speed data communication transmitters, such as in fiber optics or wireless base stations.
• Arbitrary waveform generators for RF/microwave test equipment.
• Advanced digital radio and television broadcasting systems.
• Broadband measurement and instrumentation systems requiring high-quality analog outputs.
• Next-generation chipsets for telecommunications equipment supporting higher data rates and bandwidths.

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• Significantly increases the analog bandwidth beyond the limit of a single DAC by parallelizing the signal conversion process.
• Enables flexible allocation of spectral bands and modulation formats, suitable for modern adaptive communication standards.
• Reduces distortion and cross-talk between frequency channels using digital pre-equalization and adaptive calibration.
• Allows for scalable and modular hardware architectures (adding more DACs or mixers for wider bandwidth).
• Maintains high signal fidelity, supporting higher data rates and quality of service in communications.
• Compensates for temperature drift and analog imperfections in real time through continuous calibration.
• Supports both time and frequency domain processing, increasing design flexibility.

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Patent Abstract

The invention relates to a signal processing system, comprising at least a first, a second and a third digital-to-analog converter (31-33) (DAC); a processing unit (21) configured for splitting a sampled signal into a first and a second signal corresponding to different frequency portions of the sampled signal, transmitting the first signal to the first DAC (31), splitting the second signal into a first and a second subsignal and transmitting the first subsignal to the second DAC (32) and the second subsignal to the third DAC (33), the first subsignal corresponding to the real part of the second signal and the second subsignal corresponding to the imaginary part of the second signal; an IQ mixer (600) configured for mixing an analog output signal of the second DAC (32) and an analog output signal of the third DAC (33) and a combiner (4) for combining an analog output signal of the first DAC (31) and an output signal of the IQ mixer (600). The invention further is related to methods of signal processing.