Abstract: This invention provides a power amplifier device that satisfies both of delivering a high output and reducing the chip area occupied by the power amplifier device. The power amplifier device formed over a substrate comprises primary inductors arranged in a generally circular geometry, a ground pattern, transistor pairs, and a secondary inductor. The ground pattern is provided to extend from a portion of a region inside the circular primary inductor into regions outside the primary inductor, when viewed from the direction perpendicular to the substrate, and grounded at a plurality of points in the regions outside the primary inductor. To both ends of each primary inductor, first main electrodes of first and second transistors forming a transistor pair in linkage with the primary inductor are coupled respectively.

Abstract: In order to realize a wider bandwidth of a frequency characteristic of a power amplification circuit, outputs of differential push-pull amplifiers which are matched at respectively different frequencies are combined together by secondary inductors, and the combined signal is outputted.

Abstract: A power amplifier amplifying and compositing differential signals and capable of suppressing harmonics is provided. The power amplifier includes first amplifiers amplifying a first input signal and a second input signal, which are differential signals, a first coil receiving the first input signal and the second input signal amplified by the first amplifiers, a second coil magnetically coupled with the first coil and outputting a composite signal of the amplified first input signal and second input signal, a third coil magnetically coupled with the second coil, and a first capacitor coupled between both ends of the third coil, wherein one end of the first capacitor is coupled to a ground node.

Abstract: This invention provides a power amplifier device that satisfies both of delivering a high output and reducing the chip area occupied by the power amplifier device. The power amplifier device formed over a substrate comprises primary inductors arranged in a generally circular geometry, a ground pattern, transistor pairs, and a secondary inductor. The ground pattern is provided to extend from a portion of a region inside the circular primary inductor into regions outside the primary inductor, when viewed from the direction perpendicular to the substrate, and grounded at a plurality of points in the regions outside the primary inductor. To both ends of each primary inductor, first main electrodes of first and second transistors forming a transistor pair in linkage with the primary inductor are coupled respectively.

Abstract: A power amplifier comprises a plurality of primary inductors provided on a substrate in a circular geometry as a whole; a plurality of amplifier pairs; a secondary inductor; and a connection wiring. Each amplifier pair is coupled to two ends of a corresponding primary inductor, and amplifies and output to the corresponding primary inductor a pair of first and second signals given as differential input signals, respectively. The secondary inductor is provided adjacent to the primary inductors in a circular geometry, further combines and outputs signals made by combining first and second signals in each primary inductor. The connection wiring is provided inside the primary inductors on the substrate and electrically couples middle points of respective primary inductors with each other.

Abstract: In order to realize a wider bandwidth of a frequency characteristic of a power amplification circuit, outputs of differential push-pull amplifiers which are matched at respectively different frequencies are combined together by secondary inductors, and the combined signal is outputted.

Abstract: A power amplifier amplifying and compositing differential signals and capable of suppressing harmonics is provided. The power amplifier includes first amplifiers amplifying a first input signal and a second input signal, which are differential signals, a first coil receiving the first input signal and the second input signal amplified by the first amplifiers, a second coil magnetically coupled with the first coil and outputting a composite signal of the amplified first input signal and second input signal, a third coil magnetically coupled with the second coil, and a first capacitor coupled between both ends of the third coil, wherein one end of the first capacitor is coupled to a ground node.

Abstract: An antenna switch apparatus and a switching method thereof including an antenna-input for cable broadcasting and an antenna-input for terrestrial broadcasting and satellite broadcasting, always receiving an OOB signal, and freely selecting one of a cable broadcasting channel and a terrestrial broadcasting channel or a satellite broadcasting channel is provided. In the antenna switch apparatus and the switching method, the terrestrial broadcasting signal is input to a select means, the cable broadcasting signal is split by a split means and the signals are input to an OOB tuner and the select means, then a signal selected by the select means is input to an A/D tuner. With this arrangement, one of the signal of the cable broadcasting channel and the terrestrial broadcasting channel or the satellite broadcasting is selected while keep receiving the OOB signal.

Abstract: An 8VSB decoder detects whether or not a digital tuner can tune in to a broadcasting signal on a selected channel, and a channel selection frequency control portion shifts, when it is detected that the broadcasting signal on the selected channel cannot be tuned in to, PLL data to the high frequency side or the low frequency side and outputs the PLL data to the digital tuner.