Patent ID: 7598809
Filing Date: 2009-10-06
Classification: H03F,H03H

Abstract:
1. An RF power amplifier comprising: a plurality of amplifier cells, each amplifier cell comprising a bipolar transistor and a base circuit, each bipolar transistor including a collector coupled to an output node, including a base, and including an emitter coupled to a ground node, each base circuit including an RF input node for receiving an RF signal, including a bias voltage node for receiving a bias voltage, and including a base node coupled to the base of the bipolar transistor, each base circuit comprising a parallel resistor-capacitor circuit including a first node coupled to said bias voltage node and said RF input node, and including a second node coupled to said base node, and wherein the base circuit includes a first circuit to control sub-harmonics of the bipolar transistor and a second circuit to provide ballast to control current collapse of the bipolar transistor.