Patent ID: 8482889
Filing Date: 2013-07-09
Classification: H02H

Abstract:
1. A band-pass structure electrostatic discharge (ESD) protection circuit which is connected between an external pad and an input/output (I/O) port of a radio frequency (RF) core circuit, comprising: a first diode and a second diode, wherein the first diode is connected between a power source and the external pad, the second diode is connected between the external pad and the ground, and the first diode and the second diode are connected in series; a third diode and a fourth diode, wherein the third diode is connected between the power source and the I/O port, the fourth diode is connected between the I/O port and the ground, and the third diode and the fourth diode are connected in series; a fifth diode and a sixth diode connected between the external pad and the I/O port reversely in parallel; a first inductor connected between the external pad and the ground; and a second inductor connected between the I/O port and the ground, wherein the operation frequency of the RF core circuit is ω, wherein the equivalent capacitance of each diode is C wherein the inductance of each inductor is 1/(C