| 摘要 |
<p>Disclosed is a method and apparatus to provide transient event protection for a circuit. An example apparatus includes a first clamp circuit.The first power circuit provides a first reference voltage. The first clamp circuit directs energy from a signal node to the first power circuit in response to a transient resulting from a voltage at the signal node which is lower than a second reference voltage. The apparatus also includes a second clamp circuit. The second clamp circuit includes a transistor. A collector terminal of the transistor is prevented from having a lower voltage than the second reference voltage. A second power circuit provides the second reference voltage, which is lower than the first reference voltage. The second clamp circuit directs energy from the signal node to the second power circuit in response to the transient resulting from the voltage at the signal node which is higher than the first reference voltage.</p> |
