HIGH-FREQUENCY AMPLIFIER, AND HIGH-FREQUENCY MODULE AND WIRELESS TRANSCEIVER USING SAME
First Claim
1. A high-frequency amplifier having a high-frequency amplifying unit that amplifies and outputs a modulated analog signal, the high-frequency amplifier comprising:
- an envelope signal acquisition unit for acquiring an envelope signal of the modulated analog signal;
a control signal generator circuit that generates a control signal; and
a diode clamped variable power circuit that is connected to a supply terminal of the high-frequency amplifying unit, and functions as a power circuit of the high-frequency amplifying unit,wherein the diode clamped variable power circuit includes a plurality of diode clamped circuits each having a DC power supply, a diode, and a power transistor,wherein each of the diode clamped circuits has an output terminal that outputs a voltage of the DC power supply through the diode,wherein the diode clamped variable power circuit is structured to stack the clamped circuits in a multistage manner, and the plurality of diode clamped circuits are connected in a multistage manner through the respective output terminals so that the plurality of power transistors are connected in series with the supply terminal,wherein the DC power supplies corresponding to the respective power transistors are connected in series with one another in a multistage manner,wherein the control signal generator circuit generates the control signal that is changed according to a linear function on the basis of a magnitude of the envelope signal, andwherein the power transistor of each of the diode clamped circuits is controlled according to the control signal which is changed according to the linear function, individually, to change the supply voltage of the high-frequency amplifying unit according to the magnitude of the modulated analog signal.
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Accused Products
Abstract
There are provided a high-frequency amplifier and a high-frequency module having a high efficiency for an extensive input modulated signal power, and base station/mobile wireless machines using the amplifier or the module.
The high-frequency amplifier includes a circuit that detects an envelope of an input modulated signal; a control signal generator circuit (a voltage controlled circuit or a current controlled circuit) that can change a voltage or a current according to a given function on the basis of a magnitude of the detected envelope signal; and a diode clamped variable power circuit that connects a plurality of diode clamped circuits each including a diode, a transistor, and a DC power supply to one another.
87 Citations
15 Claims
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1. A high-frequency amplifier having a high-frequency amplifying unit that amplifies and outputs a modulated analog signal, the high-frequency amplifier comprising:
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an envelope signal acquisition unit for acquiring an envelope signal of the modulated analog signal; a control signal generator circuit that generates a control signal; and a diode clamped variable power circuit that is connected to a supply terminal of the high-frequency amplifying unit, and functions as a power circuit of the high-frequency amplifying unit, wherein the diode clamped variable power circuit includes a plurality of diode clamped circuits each having a DC power supply, a diode, and a power transistor, wherein each of the diode clamped circuits has an output terminal that outputs a voltage of the DC power supply through the diode, wherein the diode clamped variable power circuit is structured to stack the clamped circuits in a multistage manner, and the plurality of diode clamped circuits are connected in a multistage manner through the respective output terminals so that the plurality of power transistors are connected in series with the supply terminal, wherein the DC power supplies corresponding to the respective power transistors are connected in series with one another in a multistage manner, wherein the control signal generator circuit generates the control signal that is changed according to a linear function on the basis of a magnitude of the envelope signal, and wherein the power transistor of each of the diode clamped circuits is controlled according to the control signal which is changed according to the linear function, individually, to change the supply voltage of the high-frequency amplifying unit according to the magnitude of the modulated analog signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A high-frequency amplifier having a high-frequency amplifying unit that amplifies and outputs a modulated analog signal, the high-frequency amplifier comprising:
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an envelope signal acquisition unit for acquiring an envelope, signal of the modulated analog signal; a control signal generator circuit that generates a control signal; and a diode clamped variable power circuit that is connected to a supply terminal of the high-frequency amplifying unit, and functions as a power circuit of the high-frequency amplifying unit, wherein the diode clamped variable power circuit includes a plurality of diode clamped circuits each having a DC power supply, a diode, and a power transistor, wherein each of the diode clamped circuits has an output terminal that outputs a voltage of the DC power supply through the diode, wherein the diode clamped variable power circuit is structured to stack the clamped circuits in a multistage manner, and the plurality of diode clamped circuits are connected in a multistage manner through the respective output terminals so that the plurality of power transistors are connected in series with the supply terminal, wherein the DC power supplies corresponding to the respective power transistors are connected in series with one another in a multistage manner, wherein the control signal generated by the control signal generator circuit is changed according to a given function on the basis of a magnitude of the envelope signal, wherein the power transistor of each of the diode clamped circuits is controlled according to the control signal, individually, to change the supply voltage of the high-frequency amplifier according to the magnitude of the modulated analog signal, and wherein a function used in the control signal generator circuit has an offset value fixed to a lower limit value of a generated value, and does not become equal to or lower than the lower limit value. - View Dependent Claims (10, 13)
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11. A high-frequency module, comprising:
- a high-frequency amplifier unit that amplifiers a modulated analog signal; and
a baseband circuit as a transmission system,wherein the high-frequency amplifier unit is monolithically disposed on a semiconductor substrate together with the baseband circuit, wherein the high-frequency amplifier unit includes; an envelope signal acquisition unit for acquiring an envelope signal of the modulated analog signal; a control signal generator circuit that generates a control signal; and a diode clamped variable power circuit that is connected to a supply terminal of the high-frequency amplifying unit, and functions as a power circuit of the high-frequency amplifying unit, wherein the diode clamped variable power circuit includes a plurality of diode clamped circuits each having a DC power supply, a diode, and a power transistor, wherein each of the diode clamped circuits has an output terminal that outputs a voltage of the DC power supply through the diode, wherein the diode clamped variable power circuit structured to stack the clamped circuits in a multistage manner, and the plurality of diode clamped circuits are connected in a multistage manner through the respective output terminals so that the plurality of power transistors are connected in series with the supply terminal, wherein the DC power supplies corresponding to the respective power transistors are connected in series with each other in a multistage manner, wherein the control signal generator circuit generates the control signal that is changed according to a linear function on the basis of a magnitude of the envelope signal, and wherein the power transistor of each of the diode clamped circuits is controlled according to the control signal which is changed according to the linear function, individually, to change the supply voltage of the high-frequency amplifying unit according to the magnitude of the modulated analog signal. - View Dependent Claims (12)
- a high-frequency amplifier unit that amplifiers a modulated analog signal; and
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14. A wireless machine, comprising:
- a high-frequency amplifier unit that amplifiers an input modulated analog signal; and
a baseband circuit as a transmission system,wherein the high-frequency amplifier unit is monolithically disposed on a semiconductor substrate together with the baseband circuit, wherein the high-frequency amplifier unit includes; an envelope signal acquisition unit for acquiring an envelope signal of the modulated analog signal; a control signal generator circuit that generates a control signal; and a diode clamped variable power circuit that is connected to a supply terminal of the high-frequency amplifying unit, and functions as a power circuit of the high-frequency amplifying unit, wherein the diode clamped variable power circuit includes a plurality of diode clamped circuits each having a DC power supply, a diode, and a power transistor, wherein each of the diode clamped circuits has an output terminal that outputs a voltage of the DC power supply through the diode, wherein the diode clamped variable power circuit is structured to stack the clamped circuits in a multistage manner, and the plurality of diode clamped circuits are connected in a multistage manner through the respective output terminals so that the plurality of power transistors are connected in series with the supply terminal, wherein the DC power supplies corresponding to the respective power transistors are connected in series with one another in a multistage manner, wherein the control signal generator circuit generates the control signal that is changed according to a linear function on the basis of a magnitude of the envelope signal, and wherein the power transistor of each of the diode clamped circuits is controlled according to the control signal which is changed according to the linear function, individually, to change the supply voltage of the high-frequency amplifying unit according to the magnitude of the modulated analog signal. - View Dependent Claims (15)
- a high-frequency amplifier unit that amplifiers an input modulated analog signal; and
Specification