Patent ID: 6055278
Filing Date: 2000-04-25
Classification: H04B

Abstract:
A system for linearizing a non-linear electrical system, comprising:a first signal splitter for dividing an input radio frequency signal into first and second radio frequency signals, said first signal splitter having primary and secondary first signal splitter output signals, said first signal splitter primary output signal providing a major signal, said first signal splitter secondary output signal providing a minor signal;a second signal splitter having a second signal splitter input connected to receive said first signal splitter secondary output signal, said second signal splitter having second signal splitter primary and secondary output signals, said second signal splitter primary output signal including a second order pre-distortion output signal and said second signal splitter secondary output signal including a third order pre-distortion output signal;a third signal splitter having a third signal splitter input connected to receive said second splitter primary output signal, said third signal splitter having third signal splitter primary and secondary output signals, said third signal splitter primary output signal having a selected phase shift relative to the second splitter output signal received at said third signal splitter input, said third signal splitter secondary output signal having a phase shift which is substantially 180 degrees out of phase with said selected phase shift;first and second opposing diodes respectively connected to receive said third signal splitter primary and secondary output signals, said first and second opposing diode outputs being connected to produce an output signal including a second order pre-distortion signal;a fourth signal splitter having a fourth signal splitter input connected to receive said second signal splitter secondary output signal, said fourth signal splitter having fourth signal splitter primary and secondary output signals which are substantially in phase with each other;first and second non-opposing diodes respectively connected to receive said fourth signal splitter output signals, said first and second non-opposing diode outputs being connected to produce an output signal including a third order pre-distortion signal; anda signal combiner connected to receive said output signals from said opposing diodes and from said non-opposing diodes, to combine said second order and said third order pre-distortion signals, to provide a compensating signal.