Patent ID: 9166530
Filing Date: 2015-10-20
Classification: H03F

Abstract:
1. A low noise amplifier, comprising: a current mirror circuit, used for providing a mapping current; a bias circuit, electrically connected to the current mirror circuit, the bias circuit used for receiving a mapping current and outputting a first bias voltage and a second bias voltage according to the mapping current; a cascode amplifying circuit, electrically connected to the bias circuit so as to respectively receive the first bias voltage and the second bias voltage, and accordingly to work at an operation bias point, the cascode amplifying circuit used for receiving and amplifying a RF input signal and accordingly outputting a RF output signal; and a power gain compensating circuit, electrically connected between the cascode amplifying circuit and the current mirror circuit, the power gain compensating circuit used for receiving the RF output signal and accordingly outputting a gain compensating signal to the current mirror circuit so as to dynamically adjust current value of the mapping current, further compensating power gain of the low noise amplifier in order to increase linearity.