| 摘要 |
A differential comparator with an inbuilt offset due to a resistor in the transistor source circuit A series resistor 16 is placed in the source circuit of one of the input transistors 12 of a differential comparator, thereby providing an inbuilt offset in the switching threshold and removing the need for a separate reference voltage circuit. The accuracy of the inbuilt offset is about 20%, which is acceptable in many applications, and power consumption is much reduced. The comparators (36,38, figure 3) with inbuilt offsets (32,34) may be used to detect the level of a received signal in a radio receiver with automatic gain control. |
