California chip startup Retym has raised $75 million in a Series D funding round led by Spark Capital.Retym plans to develop programmable coherent digital signal processing (DSP) chips for AI and cloud infrastructure.The company's first chip is expected to be launched later this year, challenging Marvell Technology's dominance in the DSP market.Retym's technology is crucial for AI data centres, where the efficient handling of large AI models is a requirement.