Active solid-state devices (e.g. – transistors – solid-state diode – Superconductive contact or lead – Transmission line or shielded
Reexamination Certificate
2007-09-04
2007-09-04
Ha, Nathan W. (Department: 2814)
Active solid-state devices (e.g., transistors, solid-state diode
Superconductive contact or lead
Transmission line or shielded
Reexamination Certificate
active
11180470
ABSTRACT:
Described is a method where a seal ring is formed by stacking interconnected conductive layers along the perimeter of an integrated circuit (IC). The seal ring is formed continuously around the IC perimeter using a conductive chain with two distinct widths. Each section of distinct width forms a transmission having a distinct characteristic impedance. Unwanted signals may be coupled to the seal ring from signal bond pads or from internal circuitry. Because of the impedance mismatch between the different width sections of the seal ring transmission lines, only a portion of each signal is propagated through each seal ring discontinuity while the remainder is reflected. As the signal passes through multiple discontinuities in the seal ring, it is further attenuated, reducing propagation of unwanted signals. This is accomplished while preventing moisture intrusion into the IC.
REFERENCES:
patent: 4868716 (1989-09-01), Taylor et al.
patent: 5185654 (1993-02-01), Mosher et al.
patent: 5583380 (1996-12-01), Larsen et al.
patent: 5717245 (1998-02-01), Pedder
patent: 5864092 (1999-01-01), Gore et al.
patent: 5998245 (1999-12-01), Yu
patent: 6028347 (2000-02-01), Sauber et al.
patent: 6028497 (2000-02-01), Allen et al.
patent: 6105226 (2000-08-01), Gore et al.
patent: 6180876 (2001-01-01), Holmes
patent: 6212077 (2001-04-01), Brown et al.
patent: 6362524 (2002-03-01), Blish et al.
patent: 6545348 (2003-04-01), Takano
patent: 2003/0122235 (2003-07-01), Tsai et al.
Tsai Chao Chieh
Wong Shyh-Ch
Taiwan Semiconductor Manufacturing Co. Ltd.
Thomas Kayden Horstemeyer & Risley
LandOfFree
RF seal ring structure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with RF seal ring structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RF seal ring structure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3757577