| 摘要 |
<p>A delta-sigma modulator (14) is tested by sampling an input test signal at a first rate (in 24) and inputting the samples to the delta-sigma modulator under test so that the modulator outputs a digital signal representative of each sample. The input signal is also sampled at a second rate (in 26) and an error factor is then established (by 28) in accordance with the difference between the value of the output signal produced by the delta-sigma modulator and the value of the sample obtained by sampling the input signal at the second rate. By comparing the error factor to a prescribed value, the proper operation of the delta-sigma modulator can be verified. <IMAGE></p> |
