High accuracy sigma-delta digital-to-analog converter

The AXIOM_FIRDAC is a high accuracy sigma-delta digital-to-analog converter. The low out-of-band-noise (OOBN) down to -60dBFS makes the converter ideally suited for application with strict OOBN requirements. The PWM modulator is a special type of 1-bit sigma-delta modulator that produces a pulse width modulated (PWM) signal with a fixed repetition frequency. A fixed repetition rate makes the output signal insensitive to non-linear inter symbol interference (ISI).

The semi-digital FIR filter topology of the FIRDAC makes the FIRDAC behave as a multi-bit DAC. This gives the converter its excellent OOBN and makes the system robust against clock jitter and other error sources typically associated with 1-bit converters while maintaining excellent THD and good matching properties.

The AXIOM_FIRDAC is ideally suited for digital-to-analog conversion in front of (analog) class-D or class-AB amplifiers. Additionally this IP can be delivered together with up-sampling and interpolation filters as signal pre-processing. The design and layout of the FIRDAC is a highly automated process, easy to scale and good portable to several CMOS technologies.

The specifications and measurement results are based on a silicon implementation of the IP. Specifications can be modified to meet customer requirements. Porting to several technologies is possible in a contract development project.

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