Patent ID: 8779855
Filing Date: 2014-07-15
Classification: H03F

Abstract:
1. A power amplification circuit comprising: first to fourth transistors having respective drains output signals and respective source coupled to a ground; a first primary inductor coupled between the drains of the first and second transistors; a second primary inductor coupled between the drains of the third and fourth transistors; a first capacitor coupled between one and another end of the first primary inductor; a second capacitor coupled between one and another end of the second primary inductor; and a secondary inductor magnetically coupled to the first and second primary inductors, wherein the first and third transistors are operative in response to a common first signal which is one of differential signals, the second and fourth transistors are operative in response to a common second signal which is another of the differential signals, and the secondary inductor outputs an amplified signal produced based on the differential signals.