Abstract: A broadband linearizer for use with a power amplifier. The broadband linearizer includes a preamplifier, a postamplifier and a broadband linearizer bridge coupled between the preamplifier and postamplifier. The linearizer bridge comprises a power divider for coupling power to linear and nonlinear arms, and a power combiner for combining outputs of the linear and nonlinear arms. The linear arm includes a first equalizer and a delay line, and the nonlinear arm includes a distortion generator and an attenuator. A second equalizer is coupled between the power combiner and the postamplifier. A control circuit controls settings of the preamplifier, the broadband linearizer bridge, and the postamplifier. The control circuit outputs voltage bias and constant current signals to control operation of the broadband linearizer.

Abstract: A broadband linearizer for use with a power amplifier. The broadband linearizer includes a broadband linearizer bridge, a preamplifier/attenuator, a post amplifier/attenuator, and a control circuit. The broadband linearizer bridge includes a power divider and a power combiner interconnected by linear and nonlinear arms. The linear arm has a phase shifter, a passive equalizer, and a first delay line that are serially coupled together. The nonlinear arm has a distortion generator, an attenuator and a second delay line that are serially coupled together. The control circuit controls respective settings of the broadband linearizer bridge, preamplifier/attenuator and post amplifier/attenuator. The control circuit provides bias circuitry and sends command and telemetry signals to control operation of the broadband linearizer. The broadband linearizer provides for independent, flexible gain and phase control that can mate with different kinds of power amplifiers having various gain and phase performance.