Patent ID: 7769103

Claim:
A predistortion linearized amplifier, comprising: an input receiving an analog RF input signal; an analog predistortion module including an analog function generator providing analog predistortion signals based on predistortion parameters and an analog predistorter receiving the RF input signal and predistorting the RF input signal based on the analog predistortion signals; an amplifier receiving and amplifying the predistorted RF input signal and providing an RF output signal; an adaptation module coupled to the input and the amplifier output for providing updated predistortion parameters to the analog function generator, the adaptation module including subNyquist sampling means for providing time correlated sub-Nyquist rate samples of error signals derived from the input and the output RF signals and sub-Nyquist processing means for calculating updated predistortion parameters from said sub-Nyquist samples and providing the parameters to the analog function generator; an amplitude signal generator receiving the RF input signal and providing an amplitude signal related to the input signal magnitude to said analog predistortion module and said adaptation module; wherein said analog predistorter is a quadrature modulator; wherein said adaptation module further comprises an error detector receiving analog samples of the RF input signal and RF output signal and providing in phase and quadrature analog error signals; and wherein said adaptation module further comprises analog signal processing means for performing dynamic signal processing on said in phase and quadrature analog error signals and said amplitude signal and outputting M analog signals to said sub-Nyquist sampling means, where M is an integer.