| 摘要 |
In an analog/digital converter circuit, the nodes at several resistors of a voltage divider chain form reference voltage nodes. The reference voltages are compared with the analog voltage output by an analog signal source. Instead of the comparators previously used and formed from operational amplifiers, a pair of resistors with two identical resistors is provided between in each case one circuit node outputting a particular reference voltage and the analog signal source in order to be able to pick up a "0" signal at the junction of the two resistors. The voltage divider chain is connected between a negative voltage of, for example, -4 V and earth (0 V) whilst the analog signal can assume a value of between 0 V and 4 V. At the point at which the positive analog signal essentially has the same amplitude as the negative reference voltage, the voltage between the resistors of the resistor pair is about 0 V. In the case of a clocked converter, each junction between the resistors is followed by a filter/amplifier circuit which causes a flattening of the respective signal section due to its low-pass characteristic. <IMAGE> |
