High frequency power amplifier circuit and electronic component for high frequency power amplifier
First Claim
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1. A high frequency power amplifier circuit, comprising:
- a power amplifying element for amplifying a high frequency signal; and
a current-voltage converting element for converting a current into a voltage by applying a predetermined current, wherein a voltage corresponding to the voltage generated by said current-voltage converting element is applied to a control pin of said amplifying transistor thereby to make flow a current that is proportional to the current flowing to said current-voltage converting element, and wherein said power amplifying element comprises a field-effect transistor of a dual gate having a first gate and a second gate, and includes a bias control circuit that can independently set a bias voltage of said first gate and said second gate.
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Abstract
In a high frequency power amplifier circuit that supplies a bias to an amplifying FET by a current mirror method, scattering of a threshold voltage Vth due to the scattering of the channel impurity concentration of the FET, and a shift of a bias point caused by the scattering of the threshold voltage Vth and a channel length modulation coefficient λ due to a short channel effect are corrected automatically. The scattering of a high frequency power amplifying characteristic can be reduced as a result.
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8 Claims
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1. A high frequency power amplifier circuit, comprising:
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a power amplifying element for amplifying a high frequency signal; and
a current-voltage converting element for converting a current into a voltage by applying a predetermined current, wherein a voltage corresponding to the voltage generated by said current-voltage converting element is applied to a control pin of said amplifying transistor thereby to make flow a current that is proportional to the current flowing to said current-voltage converting element, and wherein said power amplifying element comprises a field-effect transistor of a dual gate having a first gate and a second gate, and includes a bias control circuit that can independently set a bias voltage of said first gate and said second gate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification