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| Number | Title | Issue Date |
| 7414474 | Operational amplifier An operational amplifier with a broad applicable band and little disturbing noise which is capable of preventing oscillation even when used in connection with a negative feedback path. The operational amplifier amplifies a difference between two input voltage signal... | 08/19/2008 |
| 7279970 | Feedback circuit For reducing various adverse effects due to provision of a low-pass filter, while suppressing an oscillation generated therein, there is provide a feedback circuit, having at least one operational amplifier, having a low-pass filter in an output portion thereof, for... | 10/09/2007 |
| 6995609 | Switching circuit and digital power amplifier To provide a switching circuit and a digital power amplifier capable of supplying much power to a load, as compared with a conventional circuit. A switching circuit of the present invention comprises a plurality of switching circuit units, in which first to f... | 02/07/2006 |
| 6992527 | Digital power amplifier A digital power amplifier has first and second switches, between a high potential power line and a low potential power line, which operate complementarily. When switching an ON switch, dead time is provided to control power to a low-pass filter. In a switching secti... | 01/31/2006 |
