High frequency amplifier circuit
First Claim
1. A high frequency amplifier circuit comprising a voltage supply means for supplying a power source voltage to an output side of a high frequency amplifying active element, said supply means including:
- signal detecting means for detecting a difference frequency signal of an input signal at a frequency lower than said input signal of said high frequency amplifier circuit; and
signal attenuation means for attenuating said difference frequency signal from an output signal by controlling said power source voltage on the basis of said difference frequency signal detected by said signal detecting means.
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Accused Products
Abstract
A high frequency amplifier circuit includes the voltage source supplying the power source voltage on the output side of the high frequency amplifying active element. The high frequency amplifier is constructed with a voltage detector detecting a difference frequency voltage of the input signal at a frequency lower than the input signal of the high frequency amplifier circuit and control portion for attenuating the difference frequency voltage from the output signal by controlling the power source voltage on the basis of the difference frequency voltage detected by the voltage detector. Therefore, distortion due to modulating the input signal with the difference frequency component of the input signal can be reduced.
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Citations
23 Claims
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1. A high frequency amplifier circuit comprising a voltage supply means for supplying a power source voltage to an output side of a high frequency amplifying active element, said supply means including:
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signal detecting means for detecting a difference frequency signal of an input signal at a frequency lower than said input signal of said high frequency amplifier circuit; and signal attenuation means for attenuating said difference frequency signal from an output signal by controlling said power source voltage on the basis of said difference frequency signal detected by said signal detecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A difference frequency attenuating circuit for substantially removing a difference frequency signal from an output of a high frequency amplifier, comprising:
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a voltage detector coupled to said output of said amplifier for detecting said difference frequency; a voltage source for supplying a voltage to said output of said amplifier; and a control portion responsive to said voltage detector for controlling said voltage source to substantially remove said difference frequency signal.
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Specification