Patent ID: 7843270
Filing Date: 2010-11-30
Classification: H03F

Abstract:
1. A low noise amplifier circuit, comprising a front end voltage sensing and matching amplification circuit having an input and two outputs, the front end voltage sensing and matching amplification circuit providing a matched signal at each output; a gain circuit having two inputs, each input being respectively coupled to at least one of the two outputs of the front end voltage sensing and matching amplification circuit, the gain circuit further having two outputs, an output signal being provided at each output of the gain circuit; and a combining circuit combining the two output signals of the gain circuit, the combining circuit having two inputs, each input being respectively coupled to at least one of the two outputs of the gain circuit, the combining circuit further comprising an output providing a combined signal; wherein the gain circuit comprising a first gain enhancement circuit having an input coupled to a first output of the front end voltage sensing and matching amplification circuit and an output coupled to a first input of the combining circuit; a second gain enhancement circuit coupled to the first gain enhancement circuit and having an input coupled to a second output of the front end voltage sensing and matching amplification circuit and an output coupled to a second input of the combining circuit; and a virtual ground circuit connected between the first gain enhancement circuit and the second gain enhancement circuit on one side and a reference potential on the other side; the first gain enhancement circuit and the second gain enhancement circuit having a common current path and being configured to provide two concurrent feedforward paths to the combining circuit.