1. A digital sigma-delta modulator for modulating a digital input signal (x) comprising: a quantizer for quantizing a sum signal (s) and producing a quantized output signal (y) at a first output and an error output signal (−q) at a second output; at least one feedback loop connected to an input adder and to at least one of the first output or the second output of the quantizer; whereby the input adder produces the sum signal (s) by adding the digital input signal (x) at an input and output signals of the at least one feedback loop; and a feedback filter in the at least one feedback loop, whereby the digital sigma-delta modulator is constructed as a systolic array.