| 摘要 |
A transition sensing circuit, which normally provides a first output, provides a second output for a predetermined duration whenever the input to the circuit changes from an input of a first type to an input of a second type, or vice versa. When the input to the circuit changes from an input of the first type to an input of the second type, the second output is obtained from the circuit for the time required to charge a first capacitor to a voltage sufficient to overcome the forward breakdown voltage of a diode. When the input to the circuit changes from an input of the second type to an input of the first type, the second output is obtained from the output of the circuit for the time required to discharge a second capacitor to a predetermined voltage.
|
