Apparatus and methods for wideband envelope tracking systems
US9445371B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2015 |
| Grant date | Sep 13, 2016 |
| Priority date | — |
| Expiry date | Jun 29, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods for wideband envelope tracking systems are disclosed herein. In certain implementations, an envelope tracker includes a DC-to-DC converter, a current digital-to-analog converter (DAC), an error amplifier, a feedback circuit, and an AC combiner. The current DAC receives a digital envelope signal, and uses the digital envelope signal to generate an envelope current. The feedback circuit is connected between an output and an inverting input of the error amplifier, and the envelope current is provided to the error amplifier's inverting input. Additionally, the AC combiner generates a power amplifier supply voltage by combining an output of the DC-to-DC converter and an output of the error amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.