TRANSMISSION LINE FILTER FOR ESD PROTECTION
First Claim
Patent Images
1. A circuit comprising:
- a signal pad;
a shorted, shunt transmission line on-chip with the signal pad and having a near end coupled to the signal pad, and a far end coupled to power supply or ground, wherein frequency dependent absolute value of impedance looking into the near end is substantially less than the impedance seen looking into any other on-chip port that is coupled to the signal pad except for the port from which an ESD signal is introduced, over a frequency range that lies somewhere above dc and below 10 GHz.
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Abstract
An integrated circuit chip has on-chip millimeter wave (mmW) circuitry. An on-chip electro static discharge, ESD, protection network couples a signal pad of the chip to the mmW circuitry. The ESD protection network has a shorted stub being a low impedance path to ground for ESD events. Other embodiments are also described and claimed.
97 Citations
24 Claims
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1. A circuit comprising:
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a signal pad; a shorted, shunt transmission line on-chip with the signal pad and having a near end coupled to the signal pad, and a far end coupled to power supply or ground, wherein frequency dependent absolute value of impedance looking into the near end is substantially less than the impedance seen looking into any other on-chip port that is coupled to the signal pad except for the port from which an ESD signal is introduced, over a frequency range that lies somewhere above dc and below 10 GHz. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An integrated circuit chip comprising:
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a signal pad; a first transmission line network having a first port and a second port, the first port being coupled to the signal pad; a second transmission line network having a first port and a second port, its first port being coupled to the second port of the first transmission line network; and a shorted stub having a near end and a far end, the near end being coupled between the second port of the first transmission line network and the first port of the second transmission line network, wherein the shorted stub and the first and second transmission line networks are adapted to (1) implement a bandpass or highpass network to pass a desired signal that is somewhere in the range above 10 GHz between the signal pad and the second port of the second transmission line network, and (2) shunt to ground an undesired electro static discharge (ESD) signal that lies somewhere between DC and 10 GHz and that is received at the signal pad. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An integrated circuit chip comprising:
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a signal pad; a first transmission line network having a first port and a second port; a second transmission line network having a first port and a second port, its first port being coupled to the second port of the first transmission line network; and a shorted stub having a near end and a far end, the near end being coupled between the second port of the first transmission line network and the first port of the second transmission line network, wherein a frequency dependent absolute value of impedance looking into the near end of the shorted stub is smaller than a frequency dependent absolute value of impedance looking into the first port of the second transmission line network over a frequency range that lies somewhere above DC and below 10 GHz. - View Dependent Claims (17, 18)
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19. An electronic system comprising:
a millimeter wave (mmW) beam forming antenna array having an integrated circuit chip as a component, the chip having a signal pad, on-chip mmW circuitry, and an on-chip electro static discharge, ESD, protection network coupling the signal pad to the mmW circuitry, the ESD protection network having a shorted stub being a low impedance path to ground for ESD events. - View Dependent Claims (20, 21, 22, 23, 24)
Specification