Patent ID: 7876540
Filing Date: 2011-01-25
Classification: H01L,H02H

Abstract:
1. An integrated circuit device having adaptive electrostatic discharge (ESD) protection and noise signal rejection, comprising: an external connection adapted for connection to a data bus; a data bus interface coupled to the external connection; a circuit function coupled to the data bus interface; an ESD protection circuit coupled to the external connection and a common of the integrated circuit device; an ESD enhancement capacitor coupled to the external connection; an ESD capacitor control, wherein the ESD capacitance control couples the ESD enhancement capacitor into the ESD protection circuit when an input of the ESD capacitor control is at a first voltage, and decouples the ESD enhancement capacitor from the ESD protection circuit when the input of the ESD capacitor control is at a second voltage; a high pass filter coupled to the external connection, wherein the high pass filter passes high frequency noise signals but not low frequency data signals; and a signal amplitude detector coupled to the high pass filter, wherein when the high frequency noise signals are present on the external connection the signal amplitude detector applies the second voltage to the ESD capacitor control, and when there are substantially no high frequency noise signals are on the external connection the signal amplitude detector applies the first voltage to the ESD capacitor control.