Patent ID: 7339436
Filing Date: 2008-03-04
Classification: H03F

Abstract:
1. An ultra broadband low noise amplifier comprising a core circuit structure, wherein the core circuit structure comprises at least: an inductive series feedback circuit, comprising an inductive component and a transistor, wherein the inductive component must be coordinated with the transistor amplification in order to provide a series-series inductive feedback route; a capacitive parallel-parallel feedback circuit, comprising a capacitive load, wherein the two end points are respectively connected to the output point and the ground point of the core circuit, and a parasitic capacitance of the transistor and the capacitive load is coordinated with the transistor amplification characteristic to form a parallel-parallel capacitive feedback route; and an inductive coil, wherein the two end points are respectively connected to the drain of the transistor and the output end of the core circuit; wherein the inductive coil provides a single frequency to control the operational frequency range of said two types of feedback circuit, in order to achieve a broadband status.