| 摘要 |
To convert an analogue signal (TP[i]), such as a voltage read signal from a radiation detector, analogue signals (TP[i]) of different size are successively applied to the input of a delta/sigma converter, it being assumed that the analogue signals (TP[i]) each remain essentially unchanged for the duration of the relevant read intervals. A single-bit analogue/digital converter in the form of a quantizer (CMP) with a regulator (ADCFB) connected in series therewith is used to generate a multibit digital signal (SB). To produce an analogue return signal (S8), this multibit digital signal is converted back into an analogue signal. The difference between the analogue signal (TP[i]) to be converted and the analogue return signal (S8) is subjected to low-pass filtering. The regulator (ADCFB) can operate in either of two modes. In a first mode of operation, it corrects target value/actual value discrepancies faster than in its second mode of operation. At the beginning of a read interval, the regulator (ADCFB) operates in the first mode of operation; it then operates in the second mode of operation for the remainder of the read interval. |
