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| Number | Title | Issue Date |
| 7173487 | Power amplification circuit and communication device using the same A power amplification circuit, and a communication device using the same, which are capable of suppressing gain decreases of a power amplifier due to increases in input signal power in a state near the saturation operation, capable of reducing its size, and low in d... | 02/06/2007 |
| 6559719 | Amplifier An amplifier includes differential input transistors, first switches arranged between each gates and source of the differential input transistors, a second switch arranged to turn on/off a current source that gives the bias of the differential input trans... | 05/06/2003 |
