Distortion compensating device and power amplifying device with distortion compensating function
First Claim
1. A distortion compensating device which is arranged in a previous stage of a power amplifier and compensates for distortion generated in said power amplifier, comprising:
- a dividing circuit in which an input signal is divided into two and outputted to first and second output terminals;
a matching circuit in which a signal from said first output terminal of said dividing circuit is inputted and an impedance is matched;
a Field-Effect Transistor in which a source thereof is grounded and a signal from said matching circuit is inputted to a gate thereof;
a band pass filter in which a signal from a drain of said Field-Effect Transistor is inputted and only a second harmonic of said input signal is passed; and
an addition circuit in which a signal outputted from said band pass filter is added to a signal outputted from said second output terminal of said dividing circuit and said added signal is inputted to said power amplifier;
wherein said impedance in said matching circuit affecting a phase of said second harmonic generated from said Field-Effect Transistor is matched so that a distortion component generated in said power amplifier is compensated for by said second harmonic inputted in said addition circuit.
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Accused Products
Abstract
One divided signal divided into two by a dividing circuit is inputted to a gate of a source grounded FET through a first matching circuit. In a drain of the FET, a second harmonic having a phase and an amplitude in accordance with an impedance of the first matching circuit is generated and extracted in a band pass filter and then the amplitude is adjusted in an attenuation circuit to input to an addition circuit through a second matching circuit. In the addition circuit, the output of the second matching circuit is added to another divided signal of the dividing circuit and inputted to a power amplifier. The impedance in the first matching circuit affecting the phase of the second harmonic generated from the FET is set so that a distortion component generated in the power amplifier is compensated for by the second harmonic inputted in the addition circuit.
37 Citations
12 Claims
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1. A distortion compensating device which is arranged in a previous stage of a power amplifier and compensates for distortion generated in said power amplifier, comprising:
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a dividing circuit in which an input signal is divided into two and outputted to first and second output terminals;
a matching circuit in which a signal from said first output terminal of said dividing circuit is inputted and an impedance is matched;
a Field-Effect Transistor in which a source thereof is grounded and a signal from said matching circuit is inputted to a gate thereof;
a band pass filter in which a signal from a drain of said Field-Effect Transistor is inputted and only a second harmonic of said input signal is passed; and
an addition circuit in which a signal outputted from said band pass filter is added to a signal outputted from said second output terminal of said dividing circuit and said added signal is inputted to said power amplifier;
wherein said impedance in said matching circuit affecting a phase of said second harmonic generated from said Field-Effect Transistor is matched so that a distortion component generated in said power amplifier is compensated for by said second harmonic inputted in said addition circuit. - View Dependent Claims (2, 3, 4)
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5. A power amplifying device with a distortion compensating function, comprising:
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a matching circuit in which an input signal is inputted and an impedance is matched;
a first Field-Effect Transistor in which a signal from said matching circuit is inputted to a gate thereof and a source thereof is grounded;
a dividing circuit in which a signal from a drain of said first Field-Effect Transistor is inputted and said signal is divided into two to output to first and second output terminals;
a band pass filter in which a signal from said first output terminal of said dividing circuit is inputted and only a second harmonic of said signal is passed;
an addition circuit in which a signal outputted from said band pass filter is added to a signal outputted from said second output terminal of said dividing circuit; and
a second Field-Effect Transistor in which a signal from said addition circuit is inputted to a gate thereof, a source thereof is grounded, and an output signal is generated from a drain thereof;
wherein said impedance in said matching circuit affecting a phase of said second harmonic generated from said first Field-Effect Transistor is matched so that a distortion component generated in said second Field-Effect Transistor is compensated for by said second harmonic inputted in said addition circuit. - View Dependent Claims (6, 7, 8)
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9. A distortion compensating device which is arranged in a previous stage of power amplifying means and compensates for distortion generated in said power amplifying means, comprising:
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dividing means in which an input signal is divided into two and outputted to first and second output sections;
matching means in which a signal from said first output section of said dividing means is inputted and an impedance is matched;
harmonic generating means in which said signal from said matching means is inputted and at least a second harmonic of said signal is generated;
band pass means in which a signal from said harmonic generating means is inputted and only a second harmonic of said signal is passed; and
addition means in which a signal outputted from said band pass means is added to a signal outputted from said second output terminal of said dividing means and said added signal is inputted to said power amplifying means;
wherein said impedance in said matching means affecting a phase of said second harmonic generated from said harmonic generating means is matched so that a distortion component generated in said power amplifying means is compensated for by said second harmonic inputted in said addition means.
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10. A power amplifying device with a distortion compensating function, comprising:
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matching means in which an input signal is inputted and an impedance is matched;
first amplifying means in which a signal from said matching means is inputted and amplified, and at least a second harmonic of said signal is generated;
dividing means in which a signal from said first amplifying means is inputted and said signal is divided into two and outputted to first and second output sections;
band pass means in which a signal from said first output section of said dividing means is inputted and only a second harmonic of said signal is passed;
addition means in which a signal outputted from said band pass means is added to a signal outputted from said second output section of said dividing means; and
second amplifying means in which a signal from said addition means is inputted and amplified;
wherein said impedance in said matching means affecting a phase of said second harmonic generated from said first amplifying means is matched so that a distortion component generated in said second amplifying means is compensated for by the second harmonic inputted in said addition means.
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11. A distortion compensating device which is arranged in a previous stage of a power amplifier and compensates for distortion generated in said power amplifier, comprising:
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a dividing circuit in which an input signal is divided into two and outputted to first and second output terminals;
a matching circuit in which a signal from said first output terminal of said dividing circuit is inputted and an impedance is matched;
a Bipolar Transistor in which an emitter thereof is grounded and a signal from said matching circuit is inputted to a base thereof;
a band pass filter in which a signal from a collector of said Bipolar Transistor is inputted and only a second harmonic of said input signal is passed; and
an addition circuit in which a signal outputted from said band pass filter is added to a signal outputted from said second output terminal of said dividing circuit and said added signal is inputted to said power amplifier;
wherein said impedance in said matching circuit affecting a phase of said second harmonic generated from said Bipolar Transistor is matched so that a distortion component generated in said power amplifier is compensated for by said second harmonic inputted in said addition circuit.
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12. A power amplifying device with a distortion compensating function, comprising:
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a matching circuit in which an input signal is inputted and an impedance is matched;
a first Bipolar Transistor in which a signal from said matching circuit is inputted to a base thereof and a source an emitter thereof is grounded;
a dividing circuit in which a signal from a collector of said first Bipolar Transistor is inputted and said signal is divided into two to output to first and second output terminals;
a band pass filter in which a signal from said first output terminal of said dividing circuit is inputted and only a second harmonic of said signal is passed;
an addition circuit in which a signal outputted from said band pass filter is added to a signal outputted from said second output terminal of said dividing circuit; and
a second Bipolar Transistor in which a signal from said addition circuit is inputted to a base thereof, an emitter thereof is grounded, and an output signal is generated from a collector thereof;
wherein said impedance in said matching circuit affecting a phase of said second harmonic generated from said first Bipolar Transistor is matched so that a distortion component generated in said second Bipolar Transistor is compensated for by said second harmonic inputted in said addition circuit.
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Specification