公开(公告)号：US4682098A

公开(公告)日：1987-07-21

申请号：US880854

申请日：1986-07-01

申请人： Evert Seevinck ,  Roelof F. Wassenaar ,  Eerke Holle

发明人： Evert Seevinck ,  Roelof F. Wassenaar ,  Eerke Holle

IPC分类号： G05F3/22 ,  H03F1/32 ,  H03F3/34 ,  H03F3/45 ,  G05F3/20 ,  G05F1/56

CPC分类号： H03F1/3211

摘要： A voltage-current converter includes a first current-source (I.sub.1) coupled by means of a diode-arranged first transistor (T.sub.1) to a first terminal (1) at reference potential and by means of a diode-arranged second transistor (T.sub.2) to a second terminal (2). The bases of a third (T.sub.3) and a fourth (T.sub.4) transistor are coupled to the first (1) and the second (2) terminal, respectively. The emitters of these transistors (T.sub.3,T.sub.4) are coupled to a second current source (I.sub.2). A voltage source (V) and a resistor (R.sub.1) for converting the voltage (V) into a signal current are arranged between the first (1) and the second (2) terminal. The signal current is amplified by the translinear-circuit of the first, second, third and fourth transistors (T.sub.1 -T.sub.4) and fed to the outputs (30,40) via cascode transistors (T.sub.9,T.sub.10). To correct the non-linearity in the voltage-current conversion due to the non-linear emitter resistors of the first (T.sub.1) and the second (T.sub.2) transistor, a correction circuit (5) having a negative input resistance is coupled to the first (1) and the second (2) terminal.

摘要翻译： 电压 - 电流转换器包括通过二极管布置的第一晶体管（T1）与参考电位的第一端子（1）耦合的第一电流源（I1），并且借助于二极管布置的第二晶体管（T2） 到第二端子（2）。 第三（T3）和第四（T4）晶体管的基极分别耦合到第一（1）和第二（2）端子。 这些晶体管（T3，T4）的发射极耦合到第二电流源（I2）。 在第一（1）和第二（2）端子之间布置有用于将电压（V）转换成信号电流的电压源（V）和电阻器（R1）。 信号电流由第一，第二，第三和第四晶体管（T1-T4）的跨导线路放大，并通过共源共栅晶体管（T9，T10）馈送到输出端（30,40）。 为了校正由于第一（T1）和第二（T2）晶体管的非线性发射极电阻引起的电压 - 电流转换中的非线性，具有负输入电阻的校正电路（5）耦合到第一 （1）和第二（2）端子。

公开(公告)号：US07755357B2

公开(公告)日：2010-07-13

申请号：US11721545

申请日：2005-12-20

申请人： Eerke Holle ,  Paulus C. H. A. Haans

发明人： Eerke Holle ,  Paulus C. H. A. Haans

IPC分类号： G01V3/00

CPC分类号： G01R33/34046

摘要： A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency includes an arrangement of substantially parallel rungs (70, 70′, 70″) and one or more generally annular strip-type end-rings (78, 78′, 78″, 80) disposed generally transverse to the parallel rungs and connected with the rungs. Each generally annular strip-type end-ring includes at least two conductor layers (82, 82′, 82″, 84, 84′, 84″, 86, 88) separated by a dielectric layer (72, 72a, 72b). A radio frequency shield (34) substantially surrounds the arrangement of substantially parallel rungs (70, 70′, 70″). At least one of the conductor layers of each end-ring is connected with the radio frequency shield.

摘要翻译： 用于以磁共振频率发送或接收信号的射频线圈包括基本上平行的梯级（70,70'，70“）和一个或多个大致环形的带状端环（78,78'，78”）的布置， ，80）大致横向于平行的梯级并与梯级连接。 每个大致环形的带状端环包括由电介质层（72,72a，72b）分开的至少两个导体层（82,82'，82“，84,84'，84”，86,88）。 射频屏蔽（34）基本上围绕基本上平行的梯级（70,70'，70“）的布置。 每个端环的至少一个导体层与射频屏蔽连接。

公开(公告)号：US06670863B2

公开(公告)日：2003-12-30

申请号：US10243078

申请日：2002-09-13

申请人： Marinus Johannes Adrianus Maria Van Helvoort ,  Eerke Holle ,  Cornelis Wilhelmus Jacobs ,  Math Rietjens

发明人： Marinus Johannes Adrianus Maria Van Helvoort ,  Eerke Holle ,  Cornelis Wilhelmus Jacobs ,  Math Rietjens

IPC分类号： H03H712

CPC分类号： G01R33/3685 ,  H04B15/00

摘要： The invention relates to a resonance trap (8) for suppressing electromagnetic coupling phenomena for a line (1), which resonance trap includes a conductor (10) which extends parallel to and along a part of the length of the line (1). Conventional resonance traps (8) have the drawback that a direct connection exists between the RF line and the individual resonance traps (8). It is an object of the invention to provide a resonance trap (8) which enables a modular assembly on the line (1). The object is achieved by means of a resonance trap (8) of the kind set forth in which inner conductors (10) extend parallel to the line (1) and in which outer conductors (11) extend parallel to the inner conductors (10), said inner conductors (10) being arranged at a radial distance from the line (1) which is smaller than that at which the outer conductors (11) are arranged and the outer conductors (11) being arranged to cover at least partly the inner conductors (10) in the radial direction relative to the line (1). This offers the advantage that the connection between the resonance trap (8) and the line (1) is dispensed with.

摘要翻译： 本发明涉及一种用于抑制线（1）的电磁耦合现象的共振阱（8），该共振阱包括平行于并且沿线（1）的长度的一部分延伸的导体（10）。 传统的谐振阱（8）具有在RF线路和各个谐振陷阱（8）之间存在直接连接的缺点。 本发明的目的是提供一种能够在线路（1）上进行模块化组装的共振阱（8）。 该目的是借助于内部导体（10）平行于线（1）延伸的类型的共振阱（8）实现的，其中外部导体（11）平行于内部导体（10）延伸， ，所述内部导体（10）布置成距离所述线（1）的径向距离小于所述外部导体（11）布置的距离，并且所述外部导体（11）布置成至少部分地覆盖所述内部导体 导体（10）相对于线（1）在径向上。 这提供了省去共振阱（8）和管线（1）之间的连接的优点。

公开(公告)号：US07019527B2

公开(公告)日：2006-03-28

申请号：US10508220

申请日：2003-02-25

申请人： Robert Paul Kleihorst ,  Eerke Holle ,  Andreas Henricus Wilhelmus Snelders

发明人： Robert Paul Kleihorst ,  Eerke Holle ,  Andreas Henricus Wilhelmus Snelders

IPC分类号： G01V3/00

CPC分类号： G01R33/3628 ,  H03H7/48

摘要： A combiner/splitter device (100) comprises two transmission lines (23, 24), wound to form a helical coil (55), this helical coil being bent to a toroidal shape. Furthermore, a capacitor (51) is provided, connected in parallel with the two outer conductors (25, 26) of the two transmission lines (23, 24). The combination of the wound transmission lines and said capacitor forms a parallel resonator (56). The combiner/splitter device is suitable for use in a magnetic resonance imaging (MRI) system to combine the output signals of a receiver coil system and/or to split the input signal of a transmission coil system used in the MRI system.

摘要翻译： 组合器/分离器装置（100）包括缠绕形成螺旋线圈（55）的两条传输线（23,24），该螺旋线圈被弯曲成环形形状。 此外，设置与两条传输线（23,24）的两个外部导体（25,26）并联连接的电容器（51）。 卷绕传输线和所述电容器的组合形成并联谐振器（56）。 组合器/分路器装置适用于磁共振成像（MRI）系统以组合接收器线圈系统的输出信号和/或分离MRI系统中使用的传输线圈系统的输入信号。

公开(公告)号：US4897595A

公开(公告)日：1990-01-30

申请号：US312505

申请日：1989-02-17

申请人： Eerke Holle

发明人： Eerke Holle

IPC分类号： G05F3/30

CPC分类号： G05F3/30

摘要： A relates to a band-gap reference-voltage arrangement includes a MOS differential amplifier (OA2) having two inputs and one output. A first bipolar transistor (Q3) has its base/emitter path coupled between one input of the differential amplifier and a specific junction point and has an emitter-collector path arranged in a first current path for carrying a first current. A second bipolar transistor (Q4) has its base/emitter path connected in series with a resistor (R6) between the other input of the differential amplifier and said junction point and has its emitter-collector path arranged in a second current path for carrying a second current. First and second transistors (P1), P2) supply said first and second currents to the first and second current paths. A feedback path is provided for feeding back the signal from the output of the differential amplifier to the first junction point and comprises a third transistor (Q5) whose base-emitter path is connected between said junction point and the output of the differential amplifier.

公开(公告)号：US20090243611A1

公开(公告)日：2009-10-01

申请号：US11721545

申请日：2005-12-20

申请人： Eerke Holle ,  Paulus C. H. A. Haans

发明人： Eerke Holle ,  Paulus C. H. A. Haans

IPC分类号： G01R33/34

CPC分类号： G01R33/34046

摘要： A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency includes an arrangement of substantially parallel rungs (70, 70′, 70″) and one or more generally annular strip-type end-rings (78, 78′, 78″, 80) disposed generally transverse to the parallel rungs and connected with the rungs. Each generally annular strip-type end-ring includes at least two conductor layers (82, 82′, 82″, 84, 84′, 84″, 86, 88) separated by a dielectric layer (72, 72a, 72b). A radio frequency shield (34) substantially surrounds the arrangement of substantially parallel rungs (70, 70′, 70″). At least one of the conductor layers of each end-ring is connected with the radio frequency shield.

摘要翻译： 用于以磁共振频率发送或接收信号的射频线圈包括基本上平行的梯级（70,70'，70“）和一个或多个大致环形的带状端环（78,78'，78）的布置 “80”）通常横向于平行的梯级布置并与梯级连接。 每个大致环形的带状端环包括由电介质层（72,72a，72b）分隔开的至少两个导体层（82,82'，82“，84,84'，84”，86,88） 。 射频屏蔽（34）基本上围绕基本平行的梯级（70,70'，70“）的布置。 每个端环的至少一个导体层与射频屏蔽连接。

公开(公告)号：US06982553B2

公开(公告)日：2006-01-03

申请号：US10493688

申请日：2002-10-17

申请人： Eerke Holle

发明人： Eerke Holle

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/422

摘要： A radio-frequency coil (RF-coil) (19) for use in a magnetic-resonance imaging apparatus comprises a number of parallel bar-shaped electric conductors (37) arranged at regular intervals on an imaginary cylinder (39) and surrounded by a radio-frequency shield (RF-shield) (49). The bar-shaped conductors surround a measuring volume (11) and are interconnected at least at one of their end portions (41, 45) by an electric end conductor (43, 47) extending in a plane transverse to the bar-shaped conductors. A further electric end conductor (51, 53) is arranged near and parallel to the end conductor (43, 47), and is electrically connected to the RF-shield (49), preferably by a flange-shaped electric conductor (55, 57). The end conductor (43, 47) and the further end conductor (51, 53) together form a transmission line. An unwanted electromagnetic field (b1) generated by current in the end conductor (43, 47) is compensated for by an electromagnetic field (b2) generated by the current in the further end conductor (51, 53). Thus, the electromagnetic field of the end conductor (43, 47) does not lead to unwanted dissipation effects and temperature increases in the body of a patient present in the measuring volume (11).

摘要翻译： 用于磁共振成像装置的射频线圈（RF）线圈（19）包括多个平行的棒状导电体（37），它们以假想的圆筒（39）上的规则间隔排列并被 射频屏蔽（RF屏蔽）（49）。 条状导体围绕测量体积（11），并且通过在横向于棒状导体的平面中延伸的电端导体（43,47）至少在其一个端部（41,45）之间互连。 另外的电端导体（51,53）设置在端子导体（43,47）附近并且平行，并且优选地通过凸缘状导电体（55,57）电连接到RF屏蔽 ）。 端部导体（43,47）和另一端部导体（51,53）一起形成传输线。 由终端导体（43,47）中的电流产生的不需要的电磁场（b 1> 1）由电流中产生的电磁场（b <2> 2）补偿 另一个端部导体（51,53）。 因此，终端导体（43,47）的电磁场不会导致存在于测量体积（11）中的患者体内的不需要的耗散效应和温度升高。

公开(公告)号：US20080161675A1

公开(公告)日：2008-07-03

申请号：US11817968

申请日：2006-03-03

申请人： Paul R. Harvey ,  Eerke Holle ,  Zhiyong Zhai

发明人： Paul R. Harvey ,  Eerke Holle ,  Zhiyong Zhai

IPC分类号： A61B5/055

CPC分类号： G01R33/34046 ,  G01R33/3415

摘要： A magnetic resonance imaging system (10) utilizes an ultra-short RF body coil (36). The ultra-short body coil (36) is shorter than the mechanical equivalent birdcage coil by at least a factor of two. Such coil provides equivalent (Bt) magnetic field-uniformity, while conforming to SAR limitations.

摘要翻译： 磁共振成像系统（10）使用超短RF体线圈（36）。 超短体线圈（36）比机械等效鸟笼线圈短至少两倍。 这种线圈在符合SAR限制的情况下提供等效的（B SUB）磁场均匀性。

公开(公告)号：US20050116711A1

公开(公告)日：2005-06-02

申请号：US10508220

申请日：2003-02-25

申请人： Robert Kleihorst ,  Eerke Holle ,  Andreas Snelders

发明人： Robert Kleihorst ,  Eerke Holle ,  Andreas Snelders

IPC分类号： A61B5/055 ,  G01R33/36 ,  H03H7/48 ,  G01V3/00

CPC分类号： G01R33/3628 ,  H03H7/48

摘要： A combiner/splitter device (100) comprises two transmission lines (23, 24), wound to form a helical coil (55), this helical coil being bent to a toroidal shape. Furthermore, a capacitor (51) is provided, connected in parallel with the two outer conductors (25, 26) of the two transmission lines (23, 24). The combination of the wound transmission lines and said capacitor forms a parallel resonator (56). The combiner/splitter device is suitable for use in a magnetic resonance imaging (MRI) system to combine the output signals of a receiver coil system and/or to split the input signal of a transmission coil system used in the MRI system.

摘要翻译： 组合器/分离器装置（100）包括缠绕形成螺旋线圈（55）的两条传输线（23,24），该螺旋线圈被弯曲成环形形状。 此外，设置与两条传输线（23,24）的两个外部导体（25,26）并联连接的电容器（51）。 卷绕传输线和所述电容器的组合形成并联谐振器（56）。 组合器/分路器装置适用于磁共振成像（MRI）系统以组合接收器线圈系统的输出信号和/或分离MRI系统中使用的传输线圈系统的输入信号。

公开(公告)号：US5373228A

公开(公告)日：1994-12-13

申请号：US197435

申请日：1994-02-14

申请人： Eerke Holle

发明人： Eerke Holle

IPC分类号： H01L27/15 ,  G05F3/26 ,  H03F1/22 ,  H03F3/343 ,  H03F3/345 ,  H03F3/347 ,  G05F3/16 ,  H03F3/04

CPC分类号： G05F3/262

摘要： An integrated circuit comprising a cascode current mirror and a bias stage for biassing the cascode current mirror, the cascode current mirror comprising, between an input terminal (11) and a supply voltage terminal (14), a first cascoded MOS transistor (21) and a first cascode MOS transistor (22) and, between an output terminal (12) and the supply voltage terminal (14), a second cascoded MOS transistor (23) and a second cascode MOS transistor (24). In order to obtain a minimal voltage between the output terminal (12) and the supply voltage terminal (14) the bias stage comprises a first bias current source (31) for generating a first bias current, a second bias current source (32) for generating a second bias current, a first bias MOS transistor (41) having a gate coupled to the gates of the two cascoded MOS transistors (21, 23), a source, and a drain coupled to the first supply voltage terminal (13) via the first bias current source (31), a second bias MOS transistor (42) having a gate coupled to the gates of the two cascode MOS transistors (22, 24), a source coupled to the source of the first bias MOS transistor (41), and a drain coupled to the first supply voltage terminal (13) via the second bias current source (32), and a third bias MOS transistor (43) coupled between the sources of the two bias MOS transistors (41, 42) and the second supply voltage terminal (14).

摘要翻译： 一种集成电路，包括共源共栅电流镜和用于偏置共源共栅电流镜的偏置级，所述共源共栅电流镜包括在输入端（11）和电源电压端（14）之间，第一级联式MOS晶体管（21）和 第一共源共栅MOS晶体管（22），以及在输出端（12）和电源电压端（14）之间，第二级联光电二极管（23）和第二共源共栅MOS晶体管（24）。 为了获得输出端子（12）和电源电压端子（14）之间的最小电压，偏压级包括用于产生第一偏置电流的第一偏置电流源（31），用于产生第一偏置电流源的第二偏置电流源 产生第二偏置电流，第一偏置MOS晶体管（41），其具有耦合到两个并联型MOS晶体管（21,23）的栅极的栅极，源极和漏极，其耦合到第一电源电压端子（13），经由 第一偏置电流源（31），具有耦合到两个共源共栅MOS晶体管（22,24）的栅极的栅极的第二偏置MOS晶体管（42），耦合到第一偏置MOS晶体管（41）的源极的源极 ）和经由第二偏置电流源（32）耦合到第一电源电压端子（13）的漏极以及耦合在两个偏置MOS晶体管（41,42）的源极之间的第三偏置MOS晶体管（43）和 第二电源电压端子（14）。