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51. 发明申请

US20100237945A1 CASCODE AMPLIFIER WITH PROTECTION CIRCUITRY 有权
标题翻译：带保护电路的CASCODE放大器
公开(公告)号：US20100237945A1
公开(公告)日：2010-09-23
申请号：US12407729
申请日：2009-03-19
申请人： Marco Cassia , Gurkanwal Singh Sahota
发明人： Marco Cassia , Gurkanwal Singh Sahota
IPC分类号： H03F3/16
CPC分类号： H03F1/223 , H03F1/523 , H03F3/211 , H03F3/72 , H03F2200/27 , H03F2200/294 , H03F2203/7206 , H03F2203/7215 , H03F2203/7236 , H03G1/0088
摘要： A cascode amplifier with protection circuitry is described. In one exemplary design, the amplifier includes multiple branches coupled in parallel, with at least one branch being switchable between “on” and “off” states. Each switchable branch includes a gain transistor coupled to a cascode transistor. The gain transistor amplifies an input signal and provides an amplified signal in the on state and does not amplify the input signal in the off state. The cascode transistor buffers the amplified signal and provides an output signal in the on state. The output signal swing may be split between the gain transistor and the cascode transistor in both the on and off states with the protection circuitry. Each transistor may then observe a fraction of the voltage swing. The voltage splitting in the off state may be achieved by floating the gain transistor and shorting the gate and source of the cascode transistor.
摘要翻译：描述了具有保护电路的共源共栅放大器。在一个示例性设计中，放大器包括并联耦合的多个分支，至少一个分支可在“开”和“关”状态之间切换。每个可切换分支包括耦合到共源共栅晶体管的增益晶体管。增益晶体管放大输入信号，并将放大的信号提供为导通状态，并且不将输入信号放大在关闭状态。共源共栅晶体管缓冲放大的信号，并提供处于导通状态的输出信号。在保护电路中，输出信号摆幅可以在开关状态和断开状态之间在增益晶体管和共源共栅晶体管之间分开。然后，每个晶体管可以观察电压摆幅的一小部分。断开状态下的分压可以通过使增益晶体管浮置并使共源共栅晶体管的栅极和源极短路来实现。

52. 发明申请

US20090156152A1 TRACKING FILTER FOR A RECEIVER 有权
标题翻译：跟踪接收器的过滤器
公开(公告)号：US20090156152A1
公开(公告)日：2009-06-18
申请号：US11955118
申请日：2007-12-12
申请人： Gurkanwal Singh Sahota , Chiewcharn Narathong , Ravi Sridhara
发明人： Gurkanwal Singh Sahota , Chiewcharn Narathong , Ravi Sridhara
IPC分类号： H04B1/10 , H04B1/16
CPC分类号： H04B1/18
摘要： A tracking filter for attenuating out-of-band signals and adjacent channel signals in a receiver is described. In one exemplary design, an apparatus includes a tracking filter, an LNA, and a downconverter. The tracking filter includes a summer, a filter, and an upconverter. The summer subtracts a feedback signal from an input signal and provides a first signal. The LNA amplifies the first signal and provides a second signal. The downconverter frequency downconverts the second signal and provides an output signal. The filter filters (e.g., differentiates) the output signal and provides a third signal. The filter blocks a desired signal and passes out-of-band signal components. The upconverter frequency upconverts the third signal and provides a fourth signal from which the feedback signal is derived. The tracking filter has an equivalent bandpass filter response and a variable center frequency determined based on the frequency of the desired signal.
摘要翻译：描述了用于衰减接收机中的带外信号和相邻信道信号的跟踪滤波器。在一个示例性设计中，装置包括跟踪滤波器，LNA和下变频器。跟踪过滤器包括夏季，过滤器和上变频器。夏季从输入信号中减去反馈信号并提供第一信号。 LNA放大第一个信号并提供第二个信号。下变频器降频转换第二信号并提供输出信号。滤波器（例如，微分）输出信号并提供第三信号。滤波器阻挡所需的信号并传出带外信号分量。上变频器对第三信号进行上变频，并提供第四信号，从中得到反馈信号。跟踪滤波器具有等效的带通滤波器响应和基于期望信号的频率确定的可变中心频率。

53. 发明申请

US20090098831A1 DUAL BAND RADIO FREQUENCY TRANSMITTER 有权
标题翻译：双频无线电频率发射机
公开(公告)号：US20090098831A1
公开(公告)日：2009-04-16
申请号：US11870365
申请日：2007-10-10
申请人： Junxiong Deng , Maulin Pareshbhai Bhagat , Gurkanwal Singh Sahota
发明人： Junxiong Deng , Maulin Pareshbhai Bhagat , Gurkanwal Singh Sahota
IPC分类号： H04B1/38
CPC分类号： H04B1/0067 , H04B1/0458 , H04B1/0483
摘要： A transmitter includes a transformer and a transformer tuning circuit. The transformer transforms a differential radio frequency (RF) signal to a single-ended RF signal. The transformer tuning circuit tunes the transformer to permit the transmitter to transmit the single-ended RF signal in a first frequency band (e.g., cellular frequency band) or a second frequency band (e.g., PCS frequency band).
摘要翻译：变送器包括变压器和变压器调谐电路。变压器将差分射频（RF）信号转换为单端RF信号。变压器调谐电路调谐变压器以允许发射机在第一频带（例如，蜂窝频带）或第二频带（例如，PCS频带）中发送单端RF信号。

54. 发明申请

US20080204148A1 AMPLIFIER WITH INTEGRATED FILTER 有权
标题翻译：具有集成滤波器的放大器
公开(公告)号：US20080204148A1
公开(公告)日：2008-08-28
申请号：US11852946
申请日：2007-09-10
申请人： Tae Wook Kim , Guy Klemens , Kenneth Charles Barnett , Susanta Sangupta , Gurkanwal Singh Sahota
发明人： Tae Wook Kim , Guy Klemens , Kenneth Charles Barnett , Susanta Sangupta , Gurkanwal Singh Sahota
IPC分类号： H03F3/187
CPC分类号： H03F1/223 , H03F3/195 , H03F3/45188 , H03F3/45475 , H03F3/72 , H03F2200/168 , H03F2200/294 , H03F2200/451 , H03F2203/45034 , H03F2203/45058 , H03F2203/45138 , H03F2203/45296 , H03F2203/45301 , H03F2203/45316 , H03F2203/45396 , H03F2203/7239 , H03G1/0017 , H03G1/0029 , H03G1/0088 , H03G3/3052 , H03G3/3078
摘要： An amplifier with integrated filter (e.g., an LNA) is described. In one design, the amplifier may include a gain stage, a filter stage, and a buffer stage. The gain stage may provide signal amplification for an input signal. The filter stage may provide filtering for the input signal. The buffer stage may buffer a filtered signal from the filter stage. The amplifier may further include a second filter stage and a second buffer stage. The second filter stage may provide additional filtering for the input signal. The second buffer stage may buffer a second filtered signal from the second filter stage. All of the stages may be stacked and coupled between a supply voltage and circuit ground. The filter stage(s) may implement an elliptical lowpass filter. Each filter stage may include an inductor and a capacitor coupled in parallel and forming a resonator tank to attenuate interfering signals.
摘要翻译：描述了具有集成滤波器（例如，LNA）的放大器。在一种设计中，放大器可以包括增益级，滤波级和缓冲级。增益级可以为输入信号提供信号放大。滤波器级可以为输入信号提供滤波。缓冲级可以缓冲来自滤波级的滤波信号。放大器还可以包括第二滤波器级和第二缓冲级。第二滤波器级可以为输入信号提供额外的滤波。第二缓冲级可以缓冲来自第二滤波级的第二滤波信号。所有级可以堆叠并耦合在电源电压和电路接地之间。滤波器级可以实现椭圆形低通滤波器。每个滤波器级可以包括并联耦合的电感器和电容器，并形成谐振器箱以衰减干扰信号。

55. 发明授权

US06819938B2 System and method for power control calibration and a wireless communication device 失效
标题翻译：用于功率控制校准的系统和方法以及无线通信设备
公开(公告)号：US06819938B2
公开(公告)日：2004-11-16
申请号：US10177057
申请日：2002-06-20
申请人： Gurkanwal Singh Sahota
发明人： Gurkanwal Singh Sahota
IPC分类号： H04B700
CPC分类号： H04W52/52 , H04B17/13
摘要： A technique for calibrating the open-loop transmit power of a wireless communication device overcomes the inherent nonlinearities in the gain control input of a variable gain amplifier (VGA). In one embodiment, a feedback circuit generates a signal indicative of the transmit power. This signal is compared with a desired transmit power level, which comprises an open-loop gain component and a closed-loop gain component. The desired transmit power level is compared with the actual transmit power level and an error signal is generated. The error signal is used to alter the gain of the VGA in the transmitter to thereby adjust the actual transmit power level to correspond with the desired transmit power level. In alternative embodiment, the receiver portion, which also contains a VGA, is pre-calibrated in a conventional manner. During a transmitter calibration process, the transmitter is coupled to the receiver input through a mixer and filter. The pre-calibrated receiver determines the actual transmit power level. The difference is used to generate error correction data to adjust for non linearities in the gain control input of the transmitter VGA.
摘要翻译：用于校准无线通信设备的开环发射功率的技术克服了可变增益放大器（VGA）的增益控制输入中的固有非线性。在一个实施例中，反馈电路产生指示发射功率的信号。将该信号与包括开环增益分量和闭环增益分量的所需发射功率电平进行比较。将期望的发射功率电平与实际发射功率电平进行比较，并产生误差信号。误差信号用于改变发射机中VGA的增益，从而调整实际的发射功率电平，使其与所需的发射功率电平相对应。在替代实施例中，还包含VGA的接收器部分以常规方式进行预校准。在发射机校准过程中，发射机通过混频器和滤波器耦合到接收机输入端。预校准的接收器确定实际的发射功率电平。该差异用于产生纠错数据，以调整发射器VGA的增益控制输入中的非线性度。

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