Multi mode bias modulator operating in envelope tracking mode or average power tracking mode and envelope tracking power amplifier using the same
US-9425744-B2 · Aug 23, 2016 · US
Multi-stage amplifiers to reduce pop noise
US8965010B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8965010-B2 |
| Application number | US-17578405-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 5, 2005 |
| Priority date | Feb 3, 2005 |
| Publication date | Feb 24, 2015 |
| Grant date | Feb 24, 2015 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
An amplifier ( 50 ) for voice or audio signals, and particularly for headset applications, uses a low g m amplifier ( 54 ) for initially charging an output node (OUT) at the beginning of a power-on phase. After charging the output node, a main amplifier ( 56 ) is enabled to amplify the voice or audio signal. At power-down, a sample-and-hold circuit ( 58 ) drives an output transistor to discharge an AC coupling capacitor ( 20 ). Thus, spikes at the output node are eliminated and an external filtering capacitor is not needed.
First claim
Opening claim text (preview).
The invention claimed is: 1. An amplifier for providing amplified signals to a speaker through an AC coupling capacitor, comprising: a first amplifying stage for charging the AC coupling capacitor, wherein the first amplifier stage comprises a p-channel transistor and an n-channel transistor, a source of the p-channel transistor coupled to a supply voltage and a drain coupled to a drain of the n-channel transistor, the source of the n-channel transistor coupled to ground, and a fe…
Assignees
Inventors
Classifications
Electricity · mapped topic
- H03F1/305Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Patent family
Related publications grouped by family.
External sources
Next steps
Free tools are coming soon. Tell us what you want to track and we'll notify you.
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US8965010B2 cover?
- An amplifier ( 50 ) for voice or audio signals, and particularly for headset applications, uses a low g m amplifier ( 54 ) for initially charging an output node (OUT) at the beginning of a power-on phase. After charging the output node, a main amplifier ( 56 ) is enabled to amplify the voice or audio signal. At power-down, a sample-and-hold circuit ( 58 ) drives an output transistor to dischar…
- Who is the assignee on this patent?
- Sorace Christian, Cusinato Paolo, Kubelec Frederic, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification H03F1/305. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 24 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).