The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 23, 2001
Filed:
Feb. 02, 1998
John H. Quigley, Phoenix, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An ESD protection circuit (,) includes a low capacitance diode (,), a voltage divider, a trigger transistor (,), and an SCR. Reducing the capacitance associated with the diode (,) makes the ESD protection circuit particularly suitable for RF applications. To form a low capacitance diode, the parasitic junction capacitance of the diode (,) is hidden in a like-doped well; for example, an N+ cathode (,) of the diode (,) may be folded or formed partially in an N-well (,). Because the N-well (,) does not form a junction with the N+ cathode, the junction capacitance associated with the portion of the N+ well lying inside the N-well is hidden or canceled by the N-well (,), thereby reducing the overall capacitance of the diode (,).