Transmission apparatus
AssigneePanasonic Corporation
InventorsShunsuke Hirano, Atsushi Yoshimoto
Life of this patent
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Abstract
A square detection circuit square-detects a portion of a high frequency transmission signal that is extracted by a directional coupler, of a high frequency transmission signal amplified by a power amplifier. A first adjustment circuit extracts a DC component from a detection output of the square detection circuit, and adjusts respective amplitudes of baseband I and Q signals generated by an I/Q signal generation circuit, in response to the extracted DC component. A second adjustment circuit extracts an AC component from the detection output of the square detection circuit, and adjusts the respective amplitudes and phases, and the respective DC offsets of the baseband I and Q signals generated by the I/Q signal generation circuit, in response to the extracted AC component.
Claims5
A transmission apparatus comprising:
- a modulator that modulates a local oscillator signal by using an in-phase signal and a quadrature signal of a baseband, and generates a high frequency signal;
- a power amplifier that amplifies the generated high frequency signal;
- a coupler that extracts a portion of the high frequency signal, from the amplified high frequency signal;
- a detection circuit that detects the extracted high frequency signal;
- a first adjustment circuit that extracts a DC component from a detection output of the detection circuit, and adjusts respective amplitudes of the in-phase signal and the quadrature signal of the baseband, in response to the extracted DC component;
- and
- a second adjustment circuit that extracts an AC component from the detection output of the detection circuit, and adjusts an amplitude, a phase and a DC offset of the in-phase signal and the quadrature signal of the baseband, in response to the extracted AC component.
Dependencies are inferred from the claim text.