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    • 28. 发明申请
    • CONTROLLER FOR A RADIO-FREQUENCY AMPLIFIER
    • 无线电频率放大器的控制器
    • US20070259630A1
    • 2007-11-08
    • US11744291
    • 2007-05-04
    • Klaus HuberRalph Oppelt
    • Klaus HuberRalph Oppelt
    • H04B1/04H01Q11/12
    • H03G3/3036G01R33/3621H03F1/3247H03F1/3282H03F1/3294H03F2200/195H03F2200/207H03F2200/336H03F2200/451H03G1/04
    • A controller for an RF amplifier, in particular for a RF amplifier of an MR tomography apparatus, has an IQ control element for adjusting the magnitude and phase an RF signal that is be fed to the RF amplifier. The IQ control element has a signal splitter that splits the RF signal into two partial signals having a 90° phase offset in an I path and a Q path, each having a multiplier for multiplying the partial signal by an I factor in the I path and a Q factor in the Q path. A summing unit recombines the partial signals. A detector determines the actual phase difference and actual amplification between the RF signal fed to the IQ control element and the RF signal amplified by the RF amplifier. An IQ controller determines the I factor and the Q factor from the actual difference and a desired phase difference and the actual amplifier and a desired amplification. The IQ controller has an operating point at which the I factor and the Q factor are the same magnitude if the actual and desired phase differences and the actual and desired amplifications are the same.
    • 用于RF放大器的控制器,特别是用于MR断层摄影装置的RF放大器的控制器具有用于调整幅度和相位的IQ控制元件,RF信号被馈送到RF放大器。 IQ控制元件具有信号分离器,其将RF信号分解成在I路径和Q路径中具有90°相位偏移的两个部分信号,每个具有用于将该部分信号乘以I路径中的I因子的乘法器和Q路径, Q路径中的Q因子。 求和单元重新组合部分信号。 检测器确定馈送到IQ控制元件的RF信号与由RF放大器放大的RF信号之间的实际相位差和实际放大。 IQ控制器根据实际差异和所需的相位差以及实际的放大器和所需的放大率来确定I因子和Q因子。 如果实际和所需的相位差以及实际和所需的放大倍数相同,则IQ控制器具有I因子和Q因子的幅度相同的工作点。