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| Number | Title | Issue Date |
| 6992543 | Mems-tuned high power, high efficiency, wide bandwidth power amplifier A circuit for matching the impedance of an output load to an active device includes a transformer including a first winding having a terminal for coupling to the output of the active device and a second winding electromagnetically coupled to the first winding, and a... | 01/31/2006 |
| 6653897 | Power amplifier apparatus A power amplifier apparatus includes a pair of power amplifiers for performing switching-type power amplification, a transformer, and a capacitor. The transformer is formed of a pair of coils that are connected in series between the corresponding output t... | 11/25/2003 |
| 5357210 | Transconductance amplifier circuit A transconductance amplifier circuit employs the known combination of a transconductance amplifier and a current comparator (with or without a ratio extender, preferably in the form of a two-stage current transformer) to compare the output current from th... | 10/18/1994 |
| 5153914 | Sound equipment system In a sound system having a sound source for generating sound signals, a low-impedance amplifier for amplifying the generated sound signals, and high-impedance loudspeakers for reproducing audible sound from the amplified sound signals, an impedance conver... | 10/06/1992 |
| 4517522 | Switching amplifier A switching amplifier for producing large output power signals, including a plurality of amplifier stages having signal inputs driven in parallel and series connected outputs. The amplifier stages amplify pulse signals representative of an input signal wi... | 05/14/1985 |
| 4490844 | Low frequency transformer A low frequency transformer for an audio system has a core, a primary winding, a secondary winding, insulation between the primary and secondary windings, a tertiary winding, and insulation between the secondary and tertiary windings. One end of the terti... | 12/25/1984 |
