Signal potential converter

摘要

In a signal potential converter, a capacitor receives an input signal CIN at one terminal thereof and has the other terminal thereof connected to a terminal node. A clamp circuit defines a potential (signal IN) at the terminal node within the range of a first potential to a second potential. The clamp circuit includes a level adjuster circuit configured to adjust at least one of the first and second potentials according to a supply voltage of a circuit that drives the input signal CIN.

主权项

1. A signal potential converter comprising:
a capacitor, one terminal of which receives an input signal and the other terminal of which is connected to a terminal node; and a clamp circuit configured to receive a potential at the terminal node, wherein the clamp circuit includes: a first connection element provided between a first power supply and the terminal node; and a second connection element provided between the terminal node and a second power supply having a lower supply voltage than the first power supply, the impedance of the first connection element decreases when the potential at the terminal node becomes lower than a first potential that is higher than the supply voltage of the second power supply, the impedance of the second connection element decreases when the potential at the terminal node becomes higher than a second potential that is lower than the supply voltage of the first power supply and higher than the first potential, and the clamp circuit includes a level adjuster circuit configured to adjust at least one of the first and second potentials according to the supply voltage of a circuit that drives the input signal.