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1. 发明授权

US08005448B1 Radio frequency duplex filter for removing transmit signals from a receive path 有权
标题翻译：用于从接收路径去除发送信号的射频双工滤波器
公开(公告)号：US08005448B1
公开(公告)日：2011-08-23
申请号：US11747032
申请日：2007-05-10
申请人： Kelvin Kai Tuan Yan , Dong-Jun Yang
发明人： Kelvin Kai Tuan Yan , Dong-Jun Yang
IPC分类号： H04B17/00
CPC分类号： H03H7/465 , H03H7/0153
摘要： The present invention is an RF duplex filter that is used to remove transmit signals from the receive path of a full duplex transceiver. The RF duplex filter includes a notch filter for blocking signals at a transmit frequency and a bandpass filter for enhancing signals at a receive frequency. The notch filter is formed with series resonant elements and the bandpass filter is formed with parallel resonant elements. One embodiment of the present invention may include tunable resonant elements for tuning the notch filter to a transmit frequency, tuning the bandpass filter to a receive frequency, or both. Calibration circuitry may be included in the full duplex receiver for adjusting the tunable resonant elements. The present invention includes a method for calibrating the tunable resonant elements.
摘要翻译：本发明是用于从全双工收发器的接收路径去除发送信号的RF双工滤波器。 RF双工滤波器包括用于阻挡发射频率信号的陷波滤波器和用于增强接收频率处的信号的带通滤波器。陷波滤波器由串联谐振元件形成，带通滤波器形成有并联谐振元件。本发明的一个实施例可以包括用于将陷波滤波器调谐到发射频率的可调谐谐振元件，将带通滤波器调谐到接收频率，或者两者。校准电路可以包括在全双工接收器中用于调节可调谐谐振元件。本发明包括校准可调谐谐振元件的方法。

2. 发明授权

US06903606B1 DC offset correction using unused LNA 失效
标题翻译：使用未使用的LNA的直流偏移校正
公开(公告)号：US06903606B1
公开(公告)日：2005-06-07
申请号：US10647775
申请日：2003-08-25
申请人： Kelvin Kai Tuan Yan , Alexander Wayne Hietala , John Crago
发明人： Kelvin Kai Tuan Yan , Alexander Wayne Hietala , John Crago
IPC分类号： H03F1/02 , H03F3/45 , H03F3/72 , H04B1/30 , H04L25/06 , H04B1/10
CPC分类号： H04L25/063 , H03F1/0277 , H03F1/30 , H03F3/45968 , H03F3/72 , H03F2200/294 , H03F2200/372 , H04B1/30
摘要： A receiver performs DC offset correction by preliminarily using an unused LNA with a terminating resistance to determine a base level DC offset. Once the DC offset is determined, a DC offset correction may be calculated and applied to an active LNA output. When determining the DC offset, the active LNA is disabled.
摘要翻译：接收机通过预先使用具有终止电阻的未使用的LNA来确定基本电平DC偏移来执行DC偏移校正。一旦DC偏移被确定，就可以计算DC偏移校正并将其应用到有效的LNA输出。当确定直流偏移时，有效LNA被禁用。

3. 发明授权

US07474158B1 Dynamic match low noise amplifier with reduced current consumption in low gain mode 有权
标题翻译：动态匹配低噪声放大器，在低增益模式下降低电流消耗
公开(公告)号：US07474158B1
公开(公告)日：2009-01-06
申请号：US11692575
申请日：2007-03-28
申请人： Seong-Mo Yim , Kelvin Kai Tuan Yan
发明人： Seong-Mo Yim , Kelvin Kai Tuan Yan
IPC分类号： H03F3/04
CPC分类号： H03F1/223 , H03F1/0205 , H03F1/26 , H03F1/56 , H03F3/45188 , H03F3/72 , H03F2200/222 , H03F2200/294 , H03F2200/366 , H03F2200/492 , H03F2203/45386 , H03F2203/7236 , H03G1/0029 , H03G1/0088
摘要： The present invention is a dual mode LNA that can operate in either normal mode or low-gain mode, which has been designed to maintain a constant input impedance when switching between the two modes of operation. Maintaining constant input impedance is called a dynamic match. The LNA has been designed to maintain a constant bandwidth when switching between normal and low-gain modes of operation. Also, the LNA has been designed to consume much less average current when operating in the low-gain mode.
摘要翻译：本发明是可以在正常模式或低增益模式下操作的双模式LNA，其被设计成在两种操作模式之间切换时保持恒定的输入阻抗。维持恒定输入阻抗称为动态匹配。 LNA设计用于在正常和低增益操作模式之间切换时保持恒定的带宽。此外，LNA设计为在低增益模式下工作时消耗更少的平均电流。

4. 发明授权

US06566963B1 Transformer-based low noise variable gain driver amplifier 有权
标题翻译：基于变压器的低噪声可变增益驱动放大器
公开(公告)号：US06566963B1
公开(公告)日：2003-05-20
申请号：US10071676
申请日：2002-02-07
申请人： Kelvin Kai Tuan Yan , Ashraf Rozek , Kihong Kim
发明人： Kelvin Kai Tuan Yan , Ashraf Rozek , Kihong Kim
IPC分类号： H03F304
CPC分类号： H03F1/22
摘要： An input amplifier stage couples its output power to a second gain stage through a transformer. The transformer coupling allows for the removal of a diode voltage drop at a second gain stage, thereby allowing the collector of the transistor in the second stage to have a larger voltage swing.
摘要翻译：输入放大器级通过变压器将其输出功率耦合到第二增益级。变压器耦合允许在第二增益级去除二极管电压降，从而允许第二级中的晶体管的集电极具有更大的电压摆幅。

5. 发明授权

US07474715B1 Variable load circuit for reducing quadrature phase error 有权
标题翻译：用于减小正交相位误差的可变负载电路
公开(公告)号：US07474715B1
公开(公告)日：2009-01-06
申请号：US10855853
申请日：2004-05-27
申请人： Wenhai Ni , Kelvin Kai Tuan Yan , Mark Alexander John Moffat
发明人： Wenhai Ni , Kelvin Kai Tuan Yan , Mark Alexander John Moffat
IPC分类号： H03C1/52 , H03G3/12
CPC分类号： H03F3/45085 , H03F2200/336 , H03F2203/45296 , H03F2203/45466 , H03F2203/45504
摘要： A variable load circuit for adjusting a phase of a differential signal including a first transistor having a first terminal adapted to receive a first component of the differential signal, a second transistor having a first terminal adapted to receive a second component of the differential signal and a second terminal coupled to a second terminal of the first transistor, and a variable current source coupled to a third terminal of both the first and second transistors. The variable current source generates a bias current based on a control signal. For each of the first and second transistors, a first capacitance is created between the first and second terminals, and a second capacitance is created between the first and third terminals. The first and second capacitances are each a function of the bias current and thus the control signal and operate to adjust the phase of the differential signal.
摘要翻译：一种可变负载电路，用于调整差分信号的相位，该差分信号包括具有适于接收差分信号的第一分量的第一端子的第一晶体管，具有适于接收差分信号的第二分量的第一端子的第二晶体管，第二端子耦合到第一晶体管的第二端子，以及耦合到第一和第二晶体管的第三端子的可变电流源。可变电流源基于控制信号产生偏置电流。对于第一和第二晶体管中的每一个，在第一和第二端子之间产生第一电容，并且在第一和第三端子之间产生第二电容。第一和第二电容各自是偏置电流的函数，因此是控制信号并且用于调整差分信号的相位。

6. 发明授权

US06816718B2 DC offset correction using dummy amplifier 有权
标题翻译：使用虚拟放大器的直流偏移校正
公开(公告)号：US06816718B2
公开(公告)日：2004-11-09
申请号：US10072361
申请日：2002-02-07
申请人： Kelvin Kai Tuan Yan , Alexander Wayne Hietala
发明人： Kelvin Kai Tuan Yan , Alexander Wayne Hietala
IPC分类号： H04B110
CPC分类号： H04B1/0032 , H03D3/008 , H04B1/005 , H04B1/006 , H04B1/30 , H04B1/406
摘要： The present invention provides a dummy low noise amplifier (LNA) and an associated resistive network. Prior to DC offset correction, the primary LNAs are deactivated and the antenna is decoupled from the receive path leading to the inputs of the primary LNAs. A resistance is selected to provide a load at the input of the dummy LNA, wherein the load emulates the input load resistance seen by the primary LNA, which will be used to receive the incoming signal. Thus, the output of the dummy LNA emulates the performance of the primary LNA used to receive the incoming signal to allow accurate DC offset correction.
摘要翻译：本发明提供了一种虚拟低噪声放大器（LNA）和相关联的电阻网络。在DC偏移校正之前，主LNA被去激活，并且天线与通向主LNA的输入的接收路径去耦。选择电阻以在虚拟LNA的输入处提供负载，其中负载模拟由主LNA看到的输入负载电阻，其将用于接收输入信号。因此，虚拟LNA的输出模拟用于接收输入信号的主LNA的性能，以允许精确的直流偏移校正。

7. 发明授权

US06819914B2 Differential mixer injection with optional step gain control 有权
标题翻译：差分混合器注入，可选步进增益控制
公开(公告)号：US06819914B2
公开(公告)日：2004-11-16
申请号：US10072374
申请日：2002-02-07
申请人： Kelvin Kai Tuan Yan , Kihong Kim , Luke Joseph
发明人： Kelvin Kai Tuan Yan , Kihong Kim , Luke Joseph
IPC分类号： H04B126
CPC分类号： H04B1/28 , H03D7/145 , H03D7/1458 , H03D7/165 , H03D2200/0025 , H03G1/0088
摘要： A differential RF input signal drives the plus and minus terminals of a center tapped primary winding, which couples the differential RF input signal to the plus and minus terminals of a center tapped secondary winding. From the secondary winding, the coupled, differential RF signal drives a double-balanced mixer core operating in response to a differential local oscillator signal. The output of the mixer core is a differential IF signal representative of the differential RF input signal down-converted at the local oscillator frequency. A step reduction in gain associated with the RF input signal may be implemented using bypass circuitry coupled across the primary of the transformer, wherein a relatively small resistance or impedance is coupled across the primary to effectively reduce the load of the differential amplifiers driving the primary.
摘要翻译：差分RF输入信号驱动中心抽头初级绕组的正负端子，将初级绕组的差分RF输入信号耦合到中心抽头次级绕组的正负端子。从次级绕组，耦合的差分RF信号驱动响应于差分本地振荡器信号而工作的双平衡混频器核。混频器内核的输出是表示以本地振荡器频率下变频的差分RF输入信号的差分IF信号。与RF输入信号相关联的增益的阶跃降低可以使用跨越变压器的初级绕组耦合的旁路电路来实现，其中相对较小的电阻或阻抗跨越初级耦合，以有效地减小驱动初级的差分放大器的负载。

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