Transmitter circuit for RF communication device, RF communication device, and method of generating an antenna output signal in a transmitter circuit

• Main Authors: Jamin, Olivier Jerome Celestin, Oddoart, Ludovic
• Format: Patent
• Language: English
• Published: 02.04.2020
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

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.