公开(公告)号：US06768384B1

公开(公告)日：2004-07-27

申请号：US09987628

申请日：2001-11-15

申请人： P. S. Mohandas ,  Anil Agarwal

发明人： P. S. Mohandas ,  Anil Agarwal

IPC分类号： H03F308

CPC分类号： H03F3/087

摘要： A high-gain, high-speed differential preamplifier is described, in which a current source is coupled to one input of a differential amplifier and the other input of the differential amplifier is coupled to a sensor. In one implementation, the current source includes a field effect transistor operating in saturation mode and a bipolar junction transmitter in an emitter follower configuration.

摘要翻译： 描述了一种高增益高速差分前置放大器，其中电流源耦合到差分放大器的一个输入，而差分放大器的另一个输入耦合到传感器。 在一个实现中，电流源包括以饱和模式工作的场效应晶体管和在射极跟随器配置中的双极结发射器。

公开(公告)号：US08265646B2

公开(公告)日：2012-09-11

申请号：US12615483

申请日：2009-11-10

申请人： Anil Agarwal

发明人： Anil Agarwal

IPC分类号： H04W72/00

CPC分类号： H04B7/18515

摘要： Novel satellite communications systems, methods, and related devices are described. In one set of embodiments, available frequency channels may be dynamically assigned to particular beams of a multi-beam satellite system. The frequency assignment may be based on the amount of frequency allocated to particular beams of the multi-beam satellite system, utilizing a novel frequency selection method employing frequency reuse constraints. There may be a number of distinct frequency channels that are each assigned to one or more different beams. Such a system may be made up of a satellite in communication with terminals (e.g., user terminals or gateways). The satellite may receive and compile bandwidth request data from the terminals, and use this information in frequency assignment.

摘要翻译： 描述了新型卫星通信系统，方法和相关设备。 在一组实施例中，可以将可用频率信道动态分配给多波束卫星系统的特定波束。 频率分配可以基于分配给多波束卫星系统的特定波束的频率的量，利用采用频率复用约束的新型频率选择方法。 可以有多个不同的频率信道被分配给一个或多个不同的波束。 这样的系统可以由与终端（例如，用户终端或网关）通信的卫星组成。 卫星可以从终端接收和编译带宽请求数据，并在频率分配中使用该信息。

公开(公告)号：US07881205B2

公开(公告)日：2011-02-01

申请号：US12019292

申请日：2008-01-24

申请人： Anil Agarwal

发明人： Anil Agarwal

IPC分类号： G06F11/00

CPC分类号： H04L1/1841 ,  H04B7/18543 ,  H04L2001/0097

摘要： Systems, methods, and devices for novel error detection and retransmission processes are described. These processes may be implemented on intermediate communication links between two end terminals, wherein the intermediate links are via satellite. Error control mechanisms to detect and retransmit lost or corrupted frames may be implemented at the network layer, or between the network and data link layers. Processes for discovering error control protocol-aware terminals are described. Features of these error control processes may include a configurable delay limit, tailored to traffic type or class.

摘要翻译： 描述了用于新颖的错误检测和重传过程的系统，方法和设备。 这些过程可以在两个终端之间的中间通信链路上实现，其中中间链路经由卫星。 用于检测和重传丢失或损坏的帧的错误控制机制可以在网络层或网络和数据链路层之间实现。 描述用于发现错误控制协议感知终端的过程。 这些错误控制过程的特征可以包括根据流量类型或类别而定制的可配置延迟限制。

公开(公告)号：US20100120357A1

公开(公告)日：2010-05-13

申请号：US12615512

申请日：2009-11-10

申请人： Anil Agarwal

发明人： Anil Agarwal

IPC分类号： H04B17/02 ,  H04B7/185

CPC分类号： H04B7/18539

摘要： Satellite communications systems, methods, and related devices are described. In one embodiment, a satellite communications system is configured to dynamically allocate bandwidth and frequencies among different beams. Bandwidth request data may be received and compiled from the terminals. The satellite may be configured with different beam coverage areas, and may dynamically allocate bandwidth and particular frequency channels to different beam coverage areas based on the requests. In each of a series of one or more epochs, and according to the bandwidth requests, there may be allocations among carrier groups, traffic classes, and particular terminals. The setup of slot structure and selection of modes for particular terminals is also addressed.

摘要翻译： 描述卫星通信系统，方法和相关设备。 在一个实施例中，卫星通信系统被配置为动态分配不同波束之间的带宽和频率。 带宽请求数据可以从终端接收和编译。 卫星可以配置有不同的波束覆盖区域，并且可以基于请求动态地将带宽和特定频率信道分配给不同的波束覆盖区域。 在一系列一个或多个历元中的每一个中，并且根据带宽请求，可能在载波组，业务类别和特定终端之间存在分配。 还讨论了槽结构的设置和特定终端的模式选择。

公开(公告)号：US06507242B1

公开(公告)日：2003-01-14

申请号：US09672122

申请日：2000-09-27

申请人： Mohandas Palathol Mana Sivadasan ,  Anil Agarwal

发明人： Mohandas Palathol Mana Sivadasan ,  Anil Agarwal

IPC分类号： H03G320

CPC分类号： H03G1/0088

摘要： One embodiment of the present invention is an improved feedback amplifier circuit having a variable closed loop gain which avoids including switching elements in its feedback network and maintains a constant output voltage window for an input signal having a wide dynamic range. That is, the switching elements are not on the active feedback path (e.g., they are isolated from the active feedback path). In this manner, the gain of the amplifier circuit may be determined only by the feedback resistance which can be more easily controlled through the use of precision resistors. Additionally, by removing the switches from the feedback network, the parasitics associated with each switch may also be removed from the feedback path of the amplifier circuit. Accordingly, the bandwidth of the feedback amplifier circuit can be controlled more effectively. Specifically, the present embodiment avoids locating the switching functionality in the feedback network by changing the output stage of the feedback amplifier circuit. In other words, the switching functionality of the present embodiment is located within the output stage of the feedback amplifier circuit. Furthermore, it is appreciated that the present embodiment provides a way to isolate the unused feedback path of the feedback amplifier circuit which has a variable closed loop gain.

摘要翻译： 本发明的一个实施例是具有可变闭环增益的改进的反馈放大器电路，其避免在其反馈网络中包括开关元件并且为具有宽动态范围的输入信号保持恒定的输出电压窗口。 也就是说，开关元件不在有源反馈路径上（例如，它们与有源反馈路径隔离）。 以这种方式，放大器电路的增益可以仅由可以通过使用精密电阻更容易控制的反馈电阻来确定。 此外，通过从反馈网络去除开关，也可以从放大器电路的反馈路径去除与每个开关相关联的寄生效应。 因此，可以更有效地控制反馈放大器电路的带宽。 具体地，本实施例通过改变反馈放大器电路的输出级来避免在反馈网络中定位开关功能。 换句话说，本实施例的开关功能位于反馈放大器电路的输出级内。 此外，应当理解，本实施例提供了一种隔离具有可变闭环增益的反馈放大器电路的未使用反馈路径的方法。

公开(公告)号：US06366135B1

公开(公告)日：2002-04-02

申请号：US09471915

申请日：1999-12-23

申请人： Kamal Dalmia ,  Anil Agarwal

发明人： Kamal Dalmia ,  Anil Agarwal

IPC分类号： G01R2500

CPC分类号： H03D13/004

摘要： A circuit comprising a first circuit and a state machine. The first circuit may be configured to generate a plurality of state inputs in response to (i) a first clock signal, (ii) a second clock signal delayed from the first clock signal, and (iii) a data signal. The state machine may be configured to generate a pump up signal and a pump down signal in response to (i) said data signal and (ii) a plurality of quadrants defined by a number of possible combinations of the state inputs. The state machine may be further configured to transition between any of the quadrants.

摘要翻译： 一种包括第一电路和状态机的电路。 第一电路可以被配置为响应于（i）第一时钟信号，（ii）从第一时钟信号延迟的第二时钟信号和（iii）数据信号来产生多个状态输入。 响应于（i）所述数据信号和（ii）由状态输入的多个可能组合定义的多个象限，状态机可以被配置为产生泵浦信号和抽空信号。 状态机可以被进一步配置成在任何象限之间转换。

公开(公告)号：US08325664B2

公开(公告)日：2012-12-04

申请号：US12615720

申请日：2009-11-10

申请人： Anil Agarwal

发明人： Anil Agarwal

IPC分类号： H04W4/00 ,  H04W72/00 ,  H04J3/22 ,  H04B7/185

CPC分类号： H04B7/18578

摘要： Novel satellite communications systems, methods, and related devices are described. In some embodiments, a satellite communications system is configured to dynamically allocate bandwidth to terminals. Such a system may be made up of a satellite in communication with terminals (e.g., user terminals or gateways). The satellite or a Network Control Center (NCC) may receive and compile bandwidth request data from the terminals. In each of a series of one or more epochs, and according to the bandwidth requests, the satellite and/or NCC may allocate carrier group resources to particular traffic classes. The assignment of allocated resources to particular terminals is also described.

摘要翻译： 描述了新型卫星通信系统，方法和相关设备。 在一些实施例中，卫星通信系统被配置为向终端动态分配带宽。 这样的系统可以由与终端（例如，用户终端或网关）通信的卫星组成。 卫星或网络控制中心（NCC）可以从终端接收和编译带宽请求数据。 在一系列一个或多个历元中的每一个中，并且根据带宽请求，卫星和/或NCC可以将特定业务类别的载波组资源分配。 还分配了分配给特定终端的资源。

公开(公告)号：US08311006B2

公开(公告)日：2012-11-13

申请号：US12615735

申请日：2009-11-10

申请人： Anil Agarwal

发明人： Anil Agarwal

IPC分类号： H04W4/00 ,  H04W72/00

CPC分类号： H04B7/18578

摘要： Novel satellite communications systems, methods, and related devices are described. In some embodiments, a satellite communications system is configured to dynamically allocate bandwidth to terminals. Such a system may be made up of a satellite in communication with terminals (e.g., user terminals or gateways). The satellite or a Network Control Center (NCC) may receive and compile bandwidth request data from the terminals. In each of a series of one or more epochs, and according to the bandwidth requests, the satellite and/or NCC may allocate carrier group resources to particular traffic classes. The assignment of allocated resources to particular terminals is also described.

摘要翻译： 描述了新型卫星通信系统，方法和相关设备。 在一些实施例中，卫星通信系统被配置为向终端动态分配带宽。 这样的系统可以由与终端（例如，用户终端或网关）通信的卫星组成。 卫星或网络控制中心（NCC）可以从终端接收和编译带宽请求数据。 在一系列一个或多个历元中的每一个中，并且根据带宽请求，卫星和/或NCC可以将特定业务类别的载波组资源分配。 还分配了分配给特定终端的资源。

公开(公告)号：US07920477B2

公开(公告)日：2011-04-05

申请号：US12019287

申请日：2008-01-24

申请人： Anil Agarwal

发明人： Anil Agarwal

IPC分类号： G06F11/00

CPC分类号： H04L1/1841 ,  H04B7/18543 ,  H04L2001/0097

摘要： Systems, methods, and devices for novel error detection and retransmission processes are described. These processes may be implemented on intermediate communication links between two end terminals, wherein the intermediate links are via satellite. Error control mechanisms to detect and retransmit lost or corrupted frames may be implemented at the network layer, or between the network and data link layers. Processes for discovering error control protocol-aware terminals are described. Features of these error control processes may include a configurable delay limit, tailored to traffic type or class.

摘要翻译： 描述了用于新颖的错误检测和重传过程的系统，方法和设备。 这些过程可以在两个终端之间的中间通信链路上实现，其中中间链路经由卫星。 用于检测和重传丢失或损坏的帧的错误控制机制可以在网络层或网络和数据链路层之间实现。 描述用于发现错误控制协议感知终端的过程。 这些错误控制过程的特征可以包括根据流量类型或类别而定制的可配置延迟限制。

公开(公告)号：US20100120418A1

公开(公告)日：2010-05-13

申请号：US12615483

申请日：2009-11-10

申请人： Anil Agarwal

发明人： Anil Agarwal

IPC分类号： H04B7/185 ,  H04W72/00

CPC分类号： H04B7/18515

摘要： Novel satellite communications systems, methods, and related devices are described. In one set of embodiments, available frequency channels may be dynamically assigned to particular beams of a multi-beam satellite system. The frequency assignment may be based on the amount of frequency allocated to particular beams of the multi-beam satellite system, utilizing a novel frequency selection method employing frequency reuse constraints. There may be a number of distinct frequency channels that are each assigned to one or more different beams. Such a system may be made up of a satellite in communication with terminals (e.g., user terminals or gateways). The satellite may receive and compile bandwidth request data from the terminals, and use this information in frequency assignment.

摘要翻译： 描述了新型卫星通信系统，方法和相关设备。 在一组实施例中，可以将可用频率信道动态分配给多波束卫星系统的特定波束。 频率分配可以基于分配给多波束卫星系统的特定波束的频率的量，利用采用频率复用约束的新型频率选择方法。 可以有多个不同的频率信道被分配给一个或多个不同的波束。 这样的系统可以由与终端（例如，用户终端或网关）通信的卫星组成。 卫星可以从终端接收和编译带宽请求数据，并在频率分配中使用该信息。