Patent ID: 7898352

Claim:
Method for generating a first and a second phase modulated carrier signal from a polar modulated input signal for construction of a driving signal for a power amplifier, the method comprising the steps of: deriving a first modulator argument and second modulator argument by summing and subtracting, respectively, a first phase information corresponding to the amplitude of an input signal to and from, respectively, a second phase information corresponding to the phase of the input signal; generating a first and a second baseband signal by respectively transforming the first modulator argument with a first sin-functionality and a first cos-functionality and generating a third and a fourth baseband signal by respectively transforming the second modulator argument with a second sin-functionality and a second cos-functionality; mixing respectively the first and the third baseband signal with a cos-component of a quadrature carrier signal to a first and a third carrier product and respectively the second and the fourth baseband signal with a sin-component of the quadrature carrier signal to a second and a fourth carrier product; and adding the first to the second carrier product and the third to the fourth carrier product, respectively, to output a first and a second phase modulated carrier signal, respectively.