Patent ID: 7400192
Filing Date: 2008-07-15
Classification: H03F,H03G

Abstract:
1. A low noise amplifier (LNA) having a variable gain mode, the LNA comprising: a selection unit comprising a first selection cell, a second selection cell, and a third selection cell for selectively transmitting an input signal to an amplification unit to select one of the first to third selection cells in accordance with the magnitude of the input signal; and an amplification unit comprising a first amplification cell for amplifying a signal applied from the first selection cell in a first gain mode and outputting, a second amplification cell for amplifying a signal applied from the second selection cell in a second gain mode and outputting, and a third amplification cell for amplifying a signal applied from the third selection cell in a third gain mode and outputting, wherein the selection unit applies bias to one of the first to third amplification cells to activate an amplification operation.