Transmitter circuit for RF communication device, RF communication device, and method of generating an antenna output signal in a transmitter circuit
US10819378B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2019 |
| Grant date | Oct 27, 2020 |
| Priority date | — |
| Expiry date | Aug 28, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/0491
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transmitter circuit includes first and second carrier signal generators for generating corresponding first and second digital carrier signals, each having the same frequency. Modulation circuitry determines a phase shift value based on a received modulation signal. Outphasing circuitry generates a first digital output signal by adding the phase shift value to the phase of the first digital carrier signal and generates a second digital output signal by subtracting the phase shift value from the phase of the second digital carrier signal. A first switched-capacitor digital-to-analog converter (DAC) receives the first digital output signal and generates a first analog antenna output signal. A second switched-capacitor DAC receives the second digital output signal and generates a second analog antenna output signal. The sampling phases of the first and second DACs are opposite one another, whereby the first and second analog antenna output signals form a time-interleaved antenna output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.