Patent ID: 9059662
Filing Date: 2015-06-16
Classification: H03D

Abstract:
1. An active combiner comprising: an output section for modifying an input signal and providing an output signal; a bias section connected to the output section for providing a bias signal to the output section for switching the output section between an amplifier mode and a variable gain amplifier mode; and an input section for providing the input signal, wherein the output section further comprises a first base-coupled transistor pair adapted to receive the input signal at emitters of the first base-coupled transistor pair, receive a bias signal at bases of the first base-coupled transistor pair, and provide the output signal at collectors of the first base-coupled transistor pair, wherein a first tuner directs the bias signal between the first base-coupled transistor pair to modify a transconductance of the bases of the first base-coupled transistor pair, and wherein the output section further comprises a second base-coupled transistor pair that is adapted to receive the input signal at emitters of the second base-coupled transistor pair, receive a bias signal at bases of the second base-coupled transistor pair, and provide the output signal at collectors of the second base-coupled transistor pair.