Delta - sigma - the data converter - arrangement and method for checking of a delta - sigma - data converter

摘要

The invention relates to a delta - sigma - the data converter - arrangement, which has at least:an analog delta - sigma - modulator (3) for receiving an analog input signal (s1) and outputting of a digital data flow signal (s2),a digital filter means (6, 7) for the purpose of accommodating at least of the digital data flow signal (s2) and outputting of a digital output signal (s4),a test signal - generator (9; 11, 12, 14) which, dependent on a current signal from the digital data signal derived (s4) a test signal (s5, s6) generates,a digital reference means (8) for receiving the test signal (s5) and outputting of a digital reference - data flow signal (s8) anda signal pick-up unit (13, 5) for receiving and outputting the data flow signal (s2) and of the digital reference - data flow signal (s8) and preferably of a difference signal (s10).The reference device forms the delta - sigma - modulator digital according to; also the test generator can be advantageously a digital delta - sigma - modulator, the test signal of the reference means digitally and the delta - sigma - modulator is fed to analog.Furthermore, the invention relates to a method for testing the delta - sigma - data converter, in which a plurality of test modes can be carried out successively.