Patent ID: 6621347
Filing Date: 2003-09-16
Classification: H03F

Abstract:
An RF amplifier comprising:a pair of power amplifying elements for receiving first and second distributed signals resulting from distribution of an input signal from the outside and having characteristics of the same amplitude and opposite phase, performing power amplification with respect to each of the first and second distributed signals that have been received, and outputting the first and second amplified signals; and a pair of transmission lines provided on a substrate having a ground and connected correspondingly to the pair of power amplifying elements, the pair of transmission lines having a pair of protruding portions provided at respective edge portions thereof disposed in opposing relation, the pair of protruding portions being disposed in mutually spaced apart and opposing relation to compose a capacitor, and a capacitance value of the capacitor is larger than a capacitance value of a capacitor composed of the ground and the pair of transmission lines.