Low cost high performance power amplifier utilizing two-stage-included local negative feedback with feedback-shifting technology
US7652531B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2008 |
| Grant date | Jan 26, 2010 |
| Priority date | — |
| Expiry date | Apr 15, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45392
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention provides a cost-effective and power-effective solution to a high performance amplifier design over conventional Class A and Class B/AB amplifiers. Without increasing cost or losing simplification of conventional Class B/AB amplifier configuration, two kinds of unique local feedback loops, which cover the second and third stages and further offer a feedback shifting feature over frequency range, are disclosed to replace the traditional Miller compensation capacitor to suppress dominant distortion, which is usually generated by the two last stages while maintaining stability of the amplifier, through high frequency end. Since the present invention provides key elements of a three-stage amplifier that enable performance improvement in a wide range of circuit design, the present invention has significant commercial values in amplifier circuit industries including audio power amplifiers, IC (integrated circuit) operational amplifiers, ADC (Analog-to-Digital Conversion) and DAC (Digital-to-Analog Conversion) buffers, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.