-
公开(公告)号：US07672649B2
公开(公告)日：2010-03-02
申请号：US11744291
申请日：2007-05-04
申请人： Klaus Huber , Ralph Oppelt
发明人： Klaus Huber , Ralph Oppelt
CPC分类号： H03G3/3036 , G01R33/3621 , H03F1/3247 , H03F1/3282 , H03F1/3294 , H03F2200/195 , H03F2200/207 , H03F2200/336 , H03F2200/451 , H03G1/04
摘要： 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.
摘要翻译： 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。
-
2.发明授权Circuit arrangement for the switchable amplification of variable electrical signals 有权用于可变电信号的可切换放大的电路布置公开(公告)号：US07183855B2
公开(公告)日：2007-02-27
申请号：US10959303
申请日：2004-10-07
申请人： Klaus Huber , Ralph Oppelt
发明人： Klaus Huber , Ralph Oppelt
IPC分类号： H03F3/68
CPC分类号： H03F3/72 , H03F2203/7239 , H03G1/0088 , H03G3/004 , H03G2201/506
摘要： Circuit arrangement for the switchable amplification of variable electrical signals having at least one signal input and a signal output. A switchable amplifier is present between signal input and signal output and is provided with an input, with an output and with a negative feedback path having at least one resistor between input and output. The circuit arrangement further comprises a voltage source, the polarity of which can be reversed by a switching element. In this case, the negative feedback path has a switchable bypass connected in parallel with the at least one resistor. The signals fed in at the amplifier input are furthermore to be fed to the amplifier output in amplified fashion via a first signal path or in unamplified fashion via a second signal path depending on the polarity of the voltage source.
摘要翻译： 用于具有至少一个信号输入和信号输出的可变电信号的可切换放大的电路布置。 在信号输入和信号输出之间存在可切换放大器，并且具有输入，输出端和负反馈路径在输入和输出之间具有至少一个电阻器。 电路装置还包括一个电压源，其极性可被开关元件反转。 在这种情况下，负反馈路径具有与至少一个电阻器并联连接的可切换旁路。 在放大器输入端馈送的信号还经由第一信号路径以放大方式被馈送到放大器输出端，或者根据电压源的极性经由第二信号路径以非放大方式馈送到放大器输出端。
-
公开(公告)号：US20170219667A1
公开(公告)日：2017-08-03
申请号：US15422136
申请日：2017-02-01
CPC分类号： G01R33/3685 , G01R33/30
摘要： A line with a standing wave trap for a magnetic resonance tomograph, and a patient couch and a magnetic resonance tomograph with the line are provided. The line includes a carrier material, a first conductor track that extends along the carrier material in the carrier material or on the carrier material, and a first conductor loop. The first conductor loop is arranged on or in the carrier material. The first conductor loop has a signal coupling to the first conductor track. The first conductor loop has a first interruption that is bridged with a first capacitance.
-
公开(公告)号：US20070259630A1
公开(公告)日：2007-11-08
申请号：US11744291
申请日：2007-05-04
申请人： Klaus Huber , Ralph Oppelt
发明人： Klaus Huber , Ralph Oppelt
CPC分类号： H03G3/3036 , G01R33/3621 , H03F1/3247 , H03F1/3282 , H03F1/3294 , H03F2200/195 , H03F2200/207 , H03F2200/336 , H03F2200/451 , H03G1/04
摘要： 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.
摘要翻译： 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。
-
5.发明申请Circuit arrangement for the switchable amplification of variable electrical signals 有权用于可变电信号的可切换放大的电路布置公开(公告)号：US20050104655A1
公开(公告)日：2005-05-19
申请号：US10959303
申请日：2004-10-07
申请人： Klaus Huber , Ralph Oppelt
发明人： Klaus Huber , Ralph Oppelt
CPC分类号： H03F3/72 , H03F2203/7239 , H03G1/0088 , H03G3/004 , H03G2201/506
摘要： Circuit arrangement for the switchable amplification of variable electrical signals having at least one signal input and a signal output. A switchable amplifier is present between signal input and signal output and is provided with an input, with an output and with a negative feedback path having at least one resistor between input and output. The circuit arrangement further comprises a voltage source, the polarity of which can be reversed by a switching element. In this case, the negative feedback path has a switchable bypass connected in parallel with the at least one resistor. The signals fed in at the amplifier input are furthermore to be fed to the amplifier output in amplified fashion via a first signal path or in unamplified fashion via a second signal path depending on the polarity of the voltage source.
摘要翻译： 用于具有至少一个信号输入和信号输出的可变电信号的可切换放大的电路布置。 在信号输入和信号输出之间存在可切换放大器，并且具有输入，输出端和负反馈路径在输入和输出之间具有至少一个电阻器。 电路装置还包括一个电压源，其极性可被开关元件反转。 在这种情况下，负反馈路径具有与至少一个电阻器并联连接的可切换旁路。 在放大器输入端馈送的信号还经由第一信号路径以放大方式被馈送到放大器输出端，或者根据电压源的极性经由第二信号路径以非放大方式馈送到放大器输出端。
-
公开(公告)号：US09935350B2
公开(公告)日：2018-04-03
申请号：US14972304
申请日：2015-12-17
申请人： Ralph Oppelt
发明人： Ralph Oppelt
CPC分类号： H01P1/225
摘要： A device for damping a standing wave on a waveguide carrying a signal is provided. The device includes at least one pair of an impedance-up-transforming and an impedance-down-transforming Boucherot bridge is connected into the waveguide. The two Boucherot bridges bring about locally increased impedances and inductance values, with the result that a significantly improved standing wave suppression or damping is obtained. The down-transforming Boucherot bridge is connected directly behind the up-transforming bridge, with the result that down-transformation to the original impedance of the waveguide again can be carried out and a signal reflection can thus be avoided.
-
公开(公告)号：US09817089B2
公开(公告)日：2017-11-14
申请号：US13722606
申请日：2012-12-20
申请人： Stephan Biber , Jan Bollenbeck , Ralph Oppelt , Georg Rauh , Wilfried Schnell , Markus Vester
发明人： Stephan Biber , Jan Bollenbeck , Ralph Oppelt , Georg Rauh , Wilfried Schnell , Markus Vester
IPC分类号： G01R33/30 , G01R33/3415 , G01R33/36 , G01R33/563
CPC分类号： G01R33/30 , G01R33/3415 , G01R33/3664 , G01R33/56383
摘要： A selection unit for a magnetic resonance imaging system may be provided. The selection unit electrically connects a first number of electrical terminals to a second number of communication entities. The selection unit is arranged in and/or on a mobile object-support element for moving an examination object which is to be depicted by the magnetic resonance imaging system into a recording position.
-
公开(公告)号：US08866482B2
公开(公告)日：2014-10-21
申请号：US13183065
申请日：2011-07-14
申请人： Jan Bollenbeck , Ralph Oppelt
发明人： Jan Bollenbeck , Ralph Oppelt
CPC分类号： G01R33/3621 , A61B5/055
摘要： A preprocessing circuit for receive signals of a local coil in a magnetic resonance facility (1) includes an arrangement for supplying at least one auxiliary frequency signal of an auxiliary frequency. For at least one or the auxiliary frequency signal, a frequency multiplier generates the auxiliary frequency signal from an intermediate signal transmitted from a receive system of the magnetic resonance facility by way of a transmission link. The multiplier generates the auxiliary frequency signal with a frequency corresponding to a whole-number fraction of the auxiliary frequency.
摘要翻译： 用于在磁共振设备（1）中本地线圈的接收信号的预处理电路包括用于提供辅助频率的至少一个辅助频率信号的装置。 对于至少一个或辅助频率信号，倍频器通过传输链路从由磁共振设备的接收系统发送的中间信号产生辅助频率信号。 乘法器产生具有对应于辅助频率的全分数的频率的辅助频率信号。
-
公开(公告)号：US20140062480A1
公开(公告)日：2014-03-06
申请号：US14018139
申请日：2013-09-04
申请人： Jan Bollenbeck , Ralph Oppelt , Markus Vester
发明人： Jan Bollenbeck , Ralph Oppelt , Markus Vester
IPC分类号： G01R33/54
CPC分类号： G01R33/54 , G01R33/3415 , G01R33/3621 , G01R33/3692
摘要： An arrangement for the transmission of magnetic resonance signals that are received with the aid of local coils is provided. The magnetic resonance signal is fed to an analog/digital converter and digitized by the analog/digital converter. The magnetic resonance signal is compressed in amplitude before being fed to the analog/digital converter, is low-pass filtered or band-pass filtered, and is expanded after digitization by the analog/digital converter. A clock rate that is higher by a factor 2n than a sampling rate n of the analog/digital converter (ADC) is used for the digital expander. A digital equalizing filter for compensating for a filter transmission function in a transition range may also be used.
摘要翻译： 提供了借助于本地线圈接收的用于传输磁共振信号的装置。 磁共振信号被馈送到模拟/数字转换器并由模拟/数字转换器数字化。 在馈送到模拟/数字转换器之前，磁共振信号以幅度被压缩，被低通滤波或带通滤波，并且在通过模拟/数字转换器数字化之后被扩展。 数字扩展器使用比模拟/数字转换器（ADC）的采样率n高2n倍的时钟速率。 也可以使用用于补偿过渡范围内的过滤器传递功能的数字均衡滤波器。
-
公开(公告)号：US20120020259A1
公开(公告)日：2012-01-26
申请号：US13183065
申请日：2011-07-14
申请人： Jan Bollenbeck , Ralph Oppelt
发明人： Jan Bollenbeck , Ralph Oppelt
CPC分类号： G01R33/3621 , A61B5/055
摘要： A preprocessing circuit for receive signals of a local coil in a magnetic resonance facility (1) includes an arrangement for supplying at least one auxiliary frequency signal of an auxiliary frequency. For at least one or the auxiliary frequency signal, a frequency multiplier generates the auxiliary frequency signal from an intermediate signal transmitted from a receive system of the magnetic resonance facility by way of a transmission link. The multiplier generates the auxiliary frequency signal with a frequency corresponding to a whole-number fraction of the auxiliary frequency.
摘要翻译： 用于在磁共振设备（1）中本地线圈的接收信号的预处理电路包括用于提供辅助频率的至少一个辅助频率信号的装置。 对于至少一个或辅助频率信号，倍频器通过传输链路从由磁共振设备的接收系统发送的中间信号产生辅助频率信号。 乘法器产生具有对应于辅助频率的全分数的频率的辅助频率信号。
-
-
-
-
-
-
-
-
-
搜索结果
117 条记录 (耗时 0.022 秒)