Apple Inc. (Cupertino, CA)
This disclosure is directed to electronic circuits and, in particular to circuits for voltage regulators.
Description of Related Art
In order to deliver an ultra-low resistance voltage regulator to digital/analog circuits, they’re typically utilized in a variety circuits. To achieve this there are a variety of voltage regulator circuits can be found for various uses. Linear voltage regulators can be employed in numerous different scenarios in which the supply voltages exceed the necessary amount to power the circuit. Linear voltage regulators may produce a voltage lower than the received supply voltage.
One kind of voltage regulator that is linear is called a low dropout (LDO) regulator. A LDO voltage regulator may operate to provide an output voltage very close to the received supply voltage. In addition, LDO voltage regulators may be quite simple to design in comparison with some other voltage regulators, such as boost or buck converters that require switching between several voltage control phases.
A dual loop LDO voltage regulator is described. In one example the circuit comprises a first current mirror having first and second transistors with source terminals that are connected to an input voltage node. It also includes another current mirror that has the fourth and third transistors in which the drain terminals of the fourth and third transistors are coupled to drain terminals of first and second transistors respectively. A feedback circuit is connected to the source terminals of the 3rd and fourth transistors. It is designed to produce feedback signals based on a reference voltage and an output voltage that is present on the source terminal of the fourth transistor. The first and second mirrors form afirst control loop. Then, the first and second mirrors that reflect current as well as the feedback circuit are part of the second loop of control.
In various ways the first control loop can provide a faster transient response time than the second control loop. The first control loop may respond rapidly to drops in the output voltage (coupled with the second mirror of current) to reduce voltage droop because of load current demand. The second loop, which comprises the feedback circuit as well as mirrors for current, may provide stability for the output voltage for an extended period.Click here to view the patent on USPTO website.
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Patent-protected technology revenue that is commercially profitable can be used to fund technology-related research and development (R&D), which can increase the chance of better technology in future.
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Patent searches are the very first step in obtaining your patent. You can do a google patent search or do a USPTO search. Patent-pending is the name used to describe the product that has been included in the patent application. You can search the public pair to find the patent application. Once the patent office has approved your application, you will be able to do an examination of the patent number to locate the issued patent. Your product will now be patented. You can also utilize the USPTO search engine. Read on for more details. Patent lawyers or a patent attorney can help you through the process. Patents in the United States are granted by the US trademark and patent office as well as the United States patent office. The office also examines trademark applications.
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To help you find the key words and concepts, try the following questions.
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- What is the purpose and composition of the invention? What is the physical structure of the invention?
- What’s the purpose of the invention?
- What are technical words and terms that describe the essence of an invention? A technical dictionary can assist you to locate the right words.
2. These terms will allow you to look up relevant Cooperative Patent Classifications using the Classification Search Tool. To find the most appropriate classification to your invention, scan the classification’s class Schemes (class schedules). Think about substituting the words you use for describing your invention, if you fail to get any results from the Classification Text Search with synonyms like the ones you used in the first step.
3. Go through the CPC Classification Definition for confirmation of the CPC classification you have found. The hyperlink to a CPC classification definition is provided in the event that the title of the classification has a blue box that includes “D” to its left. CPC classification definitions will help you determine the applicable classification’s scope, so you can pick the one that is the one that is most appropriate. Additionally, these definitions can include search tips and other suggestions that may be useful for further investigation.
4. Get patent documents using the CPC classification from the Patents Full-Text and Image Database. By focusing on the abstracts and representative drawings you can narrow your search to the most relevant patent publications.
5. This list of patent publication is the best to look at for any similarity to your idea. Pay close attention to the specification and claims. Refer to the applicant and patent examiner to obtain additional patents.
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7. You can find additional US patent publications by keyword searching in AppFT or PatFT databases, and also classification searching of patents not issued in the United States as per below. You can also utilize web search engines to find non-patent patent disclosures in literature about inventions. Here are a few examples:
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- Korean Intellectual Property Rights Information Service (KIPRIS)
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To review your search, you can hire a registered patent attorney to assist. A preliminary search will help one better prepare to talk about their invention and other related inventions with a professional patent attorney. In addition, the attorney will not spend too much time or money on patenting basics.