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:
Feb. 18, 2020
Filed:
Apr. 02, 2019
Apple Inc., Cupertino, CA (US);
Weibiao Zhang, Saratoga, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
A system and method for efficiently receiving analog input signals. In various embodiments, a functional unit includes a switch in its interface logic. The switch receives an analog input signal, and when enabled, conveys the received input signal as an analog output signal. The switch is enabled when the received enable signal is asserted. However, when the power supply voltage is at a logic low level, an output n-type device is disabled while an output p-type device is enabled. A guard p-type device serially connected with the output p-type device is disabled by other devices used to control the guard p-type device. The control devices also ensure that the body terminals of the guard p-type device and other p-type devices receive a logic high level regardless of the power supply value, which prevents forward bias currents in parasitic diodes of the p-type devices.