Bidirectional voltage differentiator circuit

摘要

A bidirectional voltage differentiator circuit comprises start-up circuitry, sensing circuitry, and output circuitry coupled to logic circuitry. The start-up circuitry acts to start-up the sensing circuitry when the circuit is powered on, and accelerates the response of the sensing circuitry thereafter. The sensing circuitry senses variation in an input voltage applied to an input node. Responsive to the voltage variation sensed by the sensing circuitry, the output circuitry produces a state change at a first or second output node. The logic circuitry receives the states of the output nodes and produces a logic output signal to indicate the occurrence of the variation sensed in the input voltage. The voltage sensing circuit is operable to sense variation of the input voltage regardless of whether the voltage is rising or falling and without regard to the DC value of the input voltage.

主权项

1. An integrated circuit comprising:
first circuitry configured to sense a change in an input voltage; second circuitry configured, in response to said first circuitry sensing a first change in said input voltage, to change a logic state of a first logic signal from a first logic state to a second logic state while said first change is occurring and then change from the second logic state back to the first logic state when said first change ends and, in response to said first circuitry sensing a second change in said input voltage, to change a logic state of a second logic signal from a third logic state to a fourth logic state while said second change is occurring and then change from the fourth logic state back to the third logic state when said second change ends; and third circuitry configured, in response to the change in said first logic signal or change in said second logic signal, to produce a third signal indicative of said first circuitry sensing said change in said input voltage.