| 摘要 |
A switching circuit is discussed that has an improved switching time in comparison with switching circuits of a known type. The circuit comprises three switches connected in series, the first switch being connected to an upper power supply and the third switch being connected to a lower power supply. The output of the circuit is connected to a circuit node located at the connection between the second and third switch. The input to the switching circuit is also connected to the third switch and additionally connected to a control circuit which provides a further output to control the first switch. The second switch is responsive to the voltage at the circuit node such that the second switch only conducts when the voltage at the output node falls below the upper supply voltage. This has the effect that the first switch is effectively isolated from the third switch during switching and allows a time delay during which the first switch is switched off under control of the control circuit and the second switch switches on. The provision of the voltage dependent second switch eliminates any "current battles' occurring between the first and third switch during switching.
|
