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1. 发明公开

EP2443741A1 IMPROVING INPUT IMPEDANCE OF LOW NOISE PREAMPLIFIERS USED FOR MRI 有权
标题翻译：改善输入阻抗低噪声前置放大器用于MRI
公开(公告)号：EP2443741A1
公开(公告)日：2012-04-25
申请号：EP10727885.5
申请日：2010-05-17
申请人： Koninklijke Philips Electronics N.V.
发明人： REYKOWSKI, Arne
IPC分类号： H03F1/08 , H03F1/10 , H03F3/193
CPC分类号： H03F1/086 , H03F1/10 , H03F3/193
摘要： A preamplifier (46) comprises a field effect transistor (64) in common source configuration. While the gate of the field effect transistor is coupled to an amplifier input circuit (e.g. MRI coil), the drain of the field effect transistor (64) is coupled to an amplifier output. The preamplifier comprises furthermore a first (66) and a second (68) source-ground connection. The first source-ground lead (66) couples the source of the field effect transistor to the ground node of the amplifier input circuit, while the second source-ground lead (68) couples the source of the field effect transistor to the ground node of the amplifier output circuit. As a result, amplifier output currents generate basically a voltage drop across the second source-ground lead (68). Thus, the amplifier input circuit is less influenced by any common voltage drop across any common source-ground connection.

2. 发明公开

EP4147352A1 RADIO FREQUENCY AMPLIFIER IMPLEMENTING AN INPUT BASEBAND ENHANCEMENT CIRCUIT AND A PROCESS OF IMPLEMENTING THE SAME 审中-实审
公开(公告)号：EP4147352A1
公开(公告)日：2023-03-15
申请号：EP21818375.4
申请日：2021-05-27
申请人： Wolfspeed, Inc.
发明人： WILSON, Richard , MARBELL, Marvin , LEFEVRE, Michael
IPC分类号： H03F1/08 , H03F1/10 , H03F1/26 , H03F1/32 , H03F1/56

3. 发明公开

EP2137589A4 ACTIVE GUARDING FOR REDUCTION OF RESISTIVE AND CAPACITIVE SIGNAL LOADING WITH ADJUSTABLE CONTROL OF COMPENSATION LEVEL 有权
标题翻译： ACTIVE PROTECTION FOR减低电阻和电容信号加载与补偿度可调控制
公开(公告)号：EP2137589A4
公开(公告)日：2012-10-31
申请号：EP08733686
申请日：2008-03-31
申请人： IMPEDIMED LTD
发明人： IRONSTONE JOEL , WANG DAVID , ZHANG FRANK , FAN CHUNG SHING , ALTMEJD MORRIE , SMITH KENNETH CARLESS
IPC分类号： G05F5/00 , H03F1/08 , H03F1/10 , H03F1/14 , H03F1/56
CPC分类号： H03F1/56 , H03F1/14

4. 发明授权

EP2445105B1 Power management system for dual travelling wave tube amplifier 有权
标题翻译：双行波管放大器的电源管理系统
公开(公告)号：EP2445105B1
公开(公告)日：2016-11-23
申请号：EP11186211.6
申请日：2011-10-21
申请人： Thales
发明人： Cuignet, Etienne , Andrin, Denis , Tonello, Emilie
IPC分类号： H03F3/58 , H01J25/34 , H01J25/38 , H04B7/185 , H03F1/10
CPC分类号： H03F3/58 , H01J25/34 , H01J25/38 , H01J25/44 , H04B7/18515

5. 发明授权

EP2443741B1 IMPROVING INPUT IMPEDANCE OF LOW NOISE PREAMPLIFIERS USED FOR MRI 有权
标题翻译：改善输入阻抗低噪声前置放大器用于MRI
公开(公告)号：EP2443741B1
公开(公告)日：2015-02-25
申请号：EP10727885.5
申请日：2010-05-17
申请人： Koninklijke Philips N.V.
发明人： REYKOWSKI, Arne
IPC分类号： H03F1/08 , H03F1/10 , H03F3/193
CPC分类号： H03F1/086 , H03F1/10 , H03F3/193

6. 发明授权

EP2137589B1 ACTIVE GUARDING FOR REDUCTION OF RESISTIVE AND CAPACITIVE SIGNAL LOADING WITH ADJUSTABLE CONTROL OF COMPENSATION LEVEL 有权
标题翻译： ACTIVE PROTECTION FOR减低电阻和电容信号加载与补偿度可调控制
公开(公告)号：EP2137589B1
公开(公告)日：2015-02-25
申请号：EP08733686.3
申请日：2008-03-31
申请人： Impedimed Limited
发明人： IRONSTONE, Joel , WANG, David , ZHANG, Frank , FAN, Chung Shing , ALTMEJD, Morrie , SMITH, Kenneth Carless
IPC分类号： G05F5/00 , H03F1/08 , H03F1/10 , H03F1/56 , H03F1/14
CPC分类号： H03F1/56 , H03F1/14

7. 发明公开

EP2445105A1 Power management system for dual travelling wave tube amplifier 有权
标题翻译：双行波管放大器电源管理系统
公开(公告)号：EP2445105A1
公开(公告)日：2012-04-25
申请号：EP11186211.6
申请日：2011-10-21
申请人： Thales
发明人： Cuignet, Etienne , Andrin, Denis , Tonello, Emilie
IPC分类号： H03F3/58 , H01J25/34 , H01J25/38 , H04B7/185 , H03F1/10
CPC分类号： H03F3/58 , H01J25/34 , H01J25/38 , H01J25/44 , H04B7/18515
摘要： Power management system, notably for a dual travelling wave tube amplifier comprising at least:
• two travelling wave tubes (10, 24), each comprising one Anode Zero (13) electrode,
• an electronic power conditioner,
the power management system being implemented in said electronic power conditioner and characterized in that it comprises power management means (22) associated with each travelling wave tube (10, 24), configured for setting the Anode Zero (13) electrode voltage to a determined minimum value when a sleep mode is activated, the power management means being maintaining the travelling wave tube (10, 24) operating power at a value below its nominal working rangeThe sleep mode can advantageously be combined with an RF-Mute mode.
摘要翻译：电力管理系统，特别是对于双行波管放大器，其至少包括：·两个行波管（10,24），每个行波管包括一个阳极零点（13）电极，·电子功率调节器，电力管理系统在所述电子功率调节器的特征在于其包括与每个行波管（10,24）相关联的电力管理装置（22），所述电力管理装置被配置为当睡眠模式被激活时将所述电极的电极电压设置为确定的最小值，功率管理装置将行波管（10,24）的工作功率维持在低于其标称工作范围的值。休眠模式可以有利地与RF静音模式组合。

8. 发明公开

EP2137589A1 ACTIVE GUARDING FOR REDUCTION OF RESISTIVE AND CAPACTIVE SIGNAL LOADING WITH ADJUSTABLE CONTROL OF COMPENSATION LEVEL 有权
标题翻译： ACTIVE PROTECTION FOR减低电阻和电容信号加载与补偿度可调控制
公开(公告)号：EP2137589A1
公开(公告)日：2009-12-30
申请号：EP08733686.3
申请日：2008-03-31
申请人： Z-Tech (Canada) Inc.
发明人： IRONSTONE, Joel , WANG, David , ZHANG, Frank , FAN, Chung Shing , ALTMEJD, Morrie , SMITH, Kenneth Carless
IPC分类号： G05F5/00 , H03F1/08 , H03F1/10
CPC分类号： H03F1/56 , H03F1/14
摘要： In various embodiments, applicants' teachings are related to an active guarding circuit and method for reducing parasitic impedance signal loading on a signal-transmission channel that is shunted by a parasitic impedance. The presence of an electrical signal on the signal-transmission channel causes a leakage current to flow through the parasitic impedance. In various embodiments, the circuit comprises an amplifier and an impedance, one terminal of the impedance is coupled to the signal-transmission channel. The input of the amplifier is coupled to the signal-transmission channel and the output is coupled to the other terminal of the impedance so as to cause a compensation current to flow through the impedance. The gain of the amplifier and the value of the impedance are selected so that the compensation current has a magnitude substantially equal to the leakage current magnitude.

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