| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal reception technique for handling a plurality of bands simultaneously while suppressing circuit scale and power consumption.SOLUTION: A low noise amplifier includes: a first amplifier for matching an input impedance, and outputting and feeding back to an input side an amplification of a signal input into the low noise amplifier; a second amplifier connected in parallel with the first amplifier to amplify the signal input into the low noise amplifier and the signal fed back from the first amplifier; and at least two third amplifiers fed with signals output from the first amplifier and the second amplifier, and provided with the function of combining noise included in the signal output from the first amplifier with noise included in the signal fed back from the first amplifier which has been amplified in the second amplifier, in phase opposition, and a filter function of passing only predetermined frequency bands of components of the signals, to whereby amplify desired waves included in a plurality of frequency bands. |
