Abstract: An amplifier includes a first voltage generating circuit that generates a first clamp voltage based on a reference voltage and a first voltage, a second voltage generating circuit that generates a second clamp voltage based on the reference voltage and a second voltage that is lower than the first voltage, a third voltage generating circuit that generates a second AC voltage that changes with the same voltage amplitude in a vertical direction of the reference voltage, based on an input first AC voltage, within a voltage range of the first voltage and the first clamp voltage, or within a voltage range of the second clamp voltage and the second voltage, and an amplification circuit that amplifies the voltage amplitude of the second AC voltage and generates a third AC voltage.

Abstract: An amplifier includes a first voltage generating circuit that generates a first clamp voltage based on a reference voltage and a first voltage, a second voltage generating circuit that generates a second clamp voltage based on the reference voltage and a second voltage that is lower than the first voltage, a third voltage generating circuit that generates a second AC voltage that changes with the same voltage amplitude in a vertical direction of the reference voltage, based on an input first AC voltage, within a voltage range of the first voltage and the first clamp voltage, or within a voltage range of the second clamp voltage and the second voltage, and an amplification circuit that amplifies the voltage amplitude of the second AC voltage and generates a third AC voltage.

Abstract: According to embodiments, in a case that a source voltage is lowered and a potential difference between the source voltage and a ripple terminal voltage is below a constant potential difference, the ripple terminal voltage is lowered until the ripple terminal voltage reaches a first threshold value when a lowered value of the source voltage is equal to or larger than a predetermined voltage that exceeds the first threshold value by the constant potential difference, and the ripple terminal voltage is lowered until the ripple terminal voltage reaches a second threshold value smaller than the first threshold value when the lowered value of the source voltage is below the predetermined voltage.

Abstract: According to embodiments, in a case that a source voltage is lowered and a potential difference between the source voltage and a ripple terminal voltage is below a constant potential difference, the ripple terminal voltage is lowered until the ripple terminal voltage reaches a first threshold value when a lowered value of the source voltage is equal to or larger than a predetermined voltage that exceeds the first threshold value by the constant potential difference, and the ripple terminal voltage is lowered until the ripple terminal voltage reaches a second threshold value smaller than the first threshold value when the lowered value of the source voltage is below the predetermined voltage.

Abstract: A power amplifier system including a power terminal, a ground terminal, an output terminal, a ripple terminal, a control terminal to which a control signal is supplied from outside, a power amplifier circuit connected between the power terminal and the ground terminal, a negative potential detection circuit connected to the output terminal, and a bias circuit which supplies a bias voltage to the power amplifier circuit, and a bias start-up circuit controlling the startup operation of the bias circuit.

Abstract: A power amplifier system including a power terminal, a ground terminal, an output terminal, a ripple terminal, a control terminal to which a control signal is supplied from outside, a power amplifier circuit connected between the power terminal and the ground terminal, a negative potential detection circuit connected to the output terminal, and a bias circuit which supplies a bias voltage to the power amplifier circuit, and a bias start-up circuit controlling the startup operation of the bias circuit.

Abstract: The present invention provides a power amplifier system that includes a power terminal, a ground terminal, an output terminal, a ripple terminal, a control terminal, a power amplifier circuit connected between the power terminal and the ground terminal, a negative potential detection circuit connected to the output terminal, a bias start-up circuit that is controlled by an input of the control terminal, an output of the negative potential detection circuit, and the potential of the ripple terminal, and controls a bias start-up signal, a power amplifier IC that has a bias circuit which is controlled to be started up by the bias start-up signal, and has its output node for outputting a power amplifier bias voltage connected to the ripple terminal, and a ripple filter capacitor externally connected to the ripple terminal of the power amplifier IC.

Abstract: A display device whereby appropriate operation control desired by a user can be conducted is implemented even if an image for driver's seat which can be seen by a driver but cannot be seen by a passenger in a passenger seat and an image for passenger seat which can be seen by the passenger in the passenger seat but cannot be seen by the driver are displayed on a common screen. The display device comprises a unit for conducting operation control on an image with priority of an image GDR for driver's seat and an image GPA for passenger seat when an operation is performed to an operating switch arranged in such a manner that the operation area for the image GDR for driver's seat on the display screen and the operation area for the image GPA for passenger seat on the display screen overlap each other.

Abstract: Even if a driver's seat use picture able to be seen from a driver and not able to be seen from a passenger's seat passenger and a passenger's seat use picture able to be seen from a passenger's seat passenger and not able to be seen from the driver are displayed on the common screen, suitable operational control desired by a user is realized. Means are provided for judging whether operations on operating switches 42DR to 47DR and 42PA to 47PA arranged so that an operating region on the display screen for the driver's seat use picture GDR and an operating region on the display screen for the passenger's seat use picture GPA overlap are from the driver's seat direction or from the passenger's seat direction and performing operational control for the picture able to be seen from that direction.

Abstract: The present invention provides a power amplifier system that includes a power terminal, a ground terminal, an output terminal, a ripple terminal, a control terminal, a power amplifier circuit connected between the power terminal and the ground terminal, a negative potential detection circuit connected to the output terminal, a bias start-up circuit that is controlled by an input of the control terminal, an output of the negative potential detection circuit, and the potential of the ripple terminal, and controls a bias start-up signal, a power amplifier IC that has a bias circuit which is controlled to be started up by the bias start-up signal, and has its output node for outputting a power amplifier bias voltage connected to the ripple terminal, and a ripple filter capacitor externally connected to the ripple terminal of the power amplifier IC.