MULTI-BAND LOW-NOISE AMPLIFIER, MULTI-BAND LOW-NOISE AMPLIFIER MODULE, WIRELESS SEMICONDUCTOR INTEGRATED CIRCUIT, AND MULTI-BAND RF MODULE

摘要

PPROBLEM TO BE SOLVED: To provide a multi-band low-noise amplifier adaptable to a plurality of RF bands, a wireless semiconductor integrated circuit reduced in chip size, and a multi-band radio module that is reduced in the number of external circuit elements required. PSOLUTION: Received signals in a plurality of frequency bands are selectively supplied to a low noise amplifier via an input impedance matching circuit, by switching over the operation mode of the low-noise amplifier. The low-noise amplifier comprises a pre-stage amplification unit, including a plurality of basic amplifiers connected to one another in parallel, the basic amplifiers sharing a load impedance connected to a source voltage and a grounded degenerated impedance; a post-stage amplifier, to which the output signals of the plurality of basic amplifiers are commonly inputted; and a bias control unit for selectively turning on the basic amplifiers, wherein the input impedance of the low-noise amplifier is optimized selectively for the matching circuit, depending on the RF band to be received. PCOPYRIGHT: (C)2006,JPO&NCIPI