TRANSMITTER CIRCUIT FOR RF COMMUNICATION DEVICE, RF COMMUNICATION DEVICE, AND METHOD OF GENERATING AN ANTENNA OUTPUT SIGNAL IN A TRANSMITTER CIRCUIT

There is described a transmitter circuit for an RF communication device, the transmitter circuit comprising (a) a first carrier signal generator (210) for generating a first digital carrier signal, (b) a second carrier signal generator (220) for generating a second digital carrier signal, the second digital carrier signal having the same frequency as the first digital carrier signal, (c) modulation circuitry (232, 234, 236) adapted to receive an amplitude modulation signal (230) and to determine a phase shift value (ϕ) based on the amplitude modulation signal, (d) outphasing circuitry (241, 242, 243, 244, 247) adapted to generate a first digital output signal (245) by adding the phase shift value to the phase of the first digital carrier signal and to generate a second digital output signal (246) by subtracting the phase shift value from the phase of the second digital carrier signal, (e) a first switched-capacitor digital to analog converter (451, 452) adapted to receive the first digital output signal and generate a corresponding first analog antenna output signal, and (f) a second switched-capacitor digital to analog converter (453, 454) adapted to receive the second digital output signal and generate a corresponding second analog antenna output signal, wherein (g) the sampling phase of the first switched-capacitor digital to analog converter is opposite to the sampling phase of the second switched-capacitor digital to analog converter, whereby the first analog antenna output signal and the second analog antenna output signal form a time-interleaved antenna output signal.. There is also described an RF communication device and a method.