公开(公告)号：US6060949A

公开(公告)日：2000-05-09

申请号：US158456

申请日：1998-09-22

申请人： Ralph Kaufman ,  Darin Hunzeker ,  Richard J. Camarillo

发明人： Ralph Kaufman ,  Darin Hunzeker ,  Richard J. Camarillo

IPC分类号： H03F3/24 ,  H03F1/02 ,  H03F1/14 ,  H03F3/60 ,  H03F3/68 ,  H03F3/72 ,  H03G1/00 ,  H04B1/04 ,  H04Q7/32

CPC分类号： H03F3/72 ,  H03F3/602 ,  H03G1/0088 ,  H03F2203/7231 ,  H03F2203/7239

摘要： A power amplifier circuit arrangement including a power amplifier, and a bypass network for bypassing an RF-input signal around the power amplifier when excess gain and output power are not needed. When the bypass network is used, the power amplifier is turned off. A circulator connects the bypass network to the power amplifier output, thus removing the requirement of an output switch. The RF-input signal enters the circulator which routes the signal toward the output of the power amplifier. Because the amplifier is off, its output appears as a high impedance and reflects the signal back to the circulator. The circulator routes the reflected signal the signal output.

摘要翻译： 一种功率放大器电路装置，包括功率放大器和旁路网络，用于在不需要额外的增益和输出功率时旁路功率放大器周围的RF输入信号。 当使用旁路网络时，功率放大器关闭。 循环器将旁路网络连接到功率放大器输出，从而消除了输出开关的要求。 RF输入信号进入循环器，将信号路由到功率放大器的输出。 由于放大器关闭，其输出显示为高阻抗，并将信号反射回循环器。 循环器将反射信号传送到信号输出端。

公开(公告)号：US06766157B1

公开(公告)日：2004-07-20

申请号：US09754104

申请日：2001-01-03

申请人： Darin Hunzeker ,  Ralph Kaufman

发明人： Darin Hunzeker ,  Ralph Kaufman

IPC分类号： H04B110

CPC分类号： H03D3/008

摘要： An LO leakage canceller for a direct conversion receiver is disclosed. The canceller includes an RF input stage operating to provide at least two input signals, a local oscillator, an in-phase processor, and a quadrature processor. The local oscillator is configured to produce at least two reference signals for modulating the two input signals. Each of the in-phase and quadrature processors includes two consecutive quadrature splitters operating to substantially reduce leakage of the reference signal from the local oscillator to the RF input stage.

摘要翻译： 公开了一种用于直接转换接收机的LO泄漏消除器。 消除器包括用于提供至少两个输入信号的RF输入级，本地振荡器，同相处理器和正交处理器。 本地振荡器被配置为产生用于调制两个输入信号的至少两个参考信号。 同相和正交处理器中的每一个包括两个连续的正交分离器，其操作以基本上减少参考信号从本地振荡器到RF输入级的泄漏。

公开(公告)号：US6088348A

公开(公告)日：2000-07-11

申请号：US255028

申请日：1999-02-22

申请人： John H. Bell, III ,  Ralph Kaufman

发明人： John H. Bell, III ,  Ralph Kaufman

IPC分类号： H04B1/40 ,  H04Q11/00

CPC分类号： H04B1/006 ,  H04B1/005 ,  H04B1/406

摘要： A wireless communication with a receiver subsystem capable of supporting communications operating on two or three distinct frequency bands while incorporating only one or two oscillating devices, respectively. For example, such a subsystem could be integrated in a wireless communication hand-held device configured to operate within three frequency ranges in order to support Cellular, PCS, and GPS services. The receiver subsystem includes a receiver subsystem front end configured to receive first, second, and third receive signals operating under three different frequency bands. The three receive signals are subjected to front-stage filtering, low-noise amplifier, and bandpass filtering in order to remove any unwanted radio frequency components. The first signal is subsequently down-converted into an IF signal by mixing it with a first reference signal generated by a first voltage controlled oscillator (VCO). The first VCO operates with a frequency band that is broader than necessary and generates the first reference signal with a predetermined frequency such that the mixing operation produces a specific common IF frequency. The second signal and third signals are similarly down-converted to a second common IF signal by mixing it with a second reference signal generated by a second voltage controlled oscillator (VCO). The present invention also includes a VCO feedback control loop, including a phased-lock-loop, for maintaining the accuracy and stability of the frequency signals produced by the first and second VCOs.

摘要翻译： 与能够支持在两个或三个不同频带上运行的通信的接收机子系统的无线通信，同时仅并入一个或两个振荡装置。 例如，这样的子系统可以集成在被配置为在三个频率范围内操作以便支持蜂窝，PCS和GPS服务的无线通信手持设备中。 接收器子系统包括被配置为接收在三个不同频带下工作的第一，第二和第三接收信号的接收器子系统前端。 三个接收信号经受前级滤波，低噪声放大器和带通滤波，以消除任何不需要的射频分量。 通过将第一信号与由第一压控振荡器（VCO）产生的第一参考信号混合，随后将其转换成IF信号。 第一VCO以比必要的宽的频带进行工作，并以预定频率产生第一参考信号，使得混频操作产生特定的公共IF频率。 通过将第二信号和第三信号与由第二压控振荡器（VCO）产生的第二参考信号混合，将第二信号和第三信号类似地下变频成第二公共IF信号。 本发明还包括一个VCO反馈控制回路，包括一个锁相环，用于保持由第一和第二VCO产生的频率信号的精度和稳定性。

公开(公告)号：US2632928A

公开(公告)日：1953-03-31

申请号：US8796149

申请日：1949-04-16

申请人： RALPH KAUFMAN

发明人： RALPH KAUFMAN

IPC分类号： E06B3/28

CPC分类号： E06B3/28

公开(公告)号：US06721368B1

公开(公告)日：2004-04-13

申请号：US09519734

申请日：2000-03-04

申请人： Saed Younis ,  Emilija Simic ,  Thomas Wilborn ,  Haitao Zhang ,  Daniel Filipovic ,  Ralph Kaufman ,  Ming (Jason) Yu Lin

发明人： Saed Younis ,  Emilija Simic ,  Thomas Wilborn ,  Haitao Zhang ,  Daniel Filipovic ,  Ralph Kaufman ,  Ming (Jason) Yu Lin

IPC分类号： H04L2704

CPC分类号： H03G3/3042 ,  H03F2203/7239 ,  H03G1/0088

摘要： Transmitter architectures for a communications system having improved performance over conventional transmitter architectures. The improvements include a combination of the following: faster response time for the control signals, improved linearity, reduced interference, reduced power consumption, lower circuit complexity, and lower costs. For a cellular application, these improvements can lead to increased system capacity, smaller telephone size, increased talk and standby times, and greater acceptance of the product. Circuitry is provided to speed up the response time of a control signal. The control loop for various elements in the transmit signal path are integrated. A gain control mechanism allows for accurate adjustment of the output transmit power level. Control mechanisms are provided to power down the power amplifier, or the entire transmit signal path, when not needed. The gains of the various elements in the transmit signal path are controlled to reduce transients in the output transmit power, and to also ensure that transients are downward.

摘要翻译： 具有比传统发射机架构具有改进性能的通信系统的发射机架构。 这些改进包括以下组合：控制信号的响应时间更快，线性度更好，干扰减少，功耗降低，电路复杂度降低，成本降低。 对于蜂窝应用，这些改进可以导致系统容量增加，电话尺寸更小，通话和待机时间增加，以及对产品的更多接受。 提供电路以加快控制信号的响应时间。 发送信号路径中的各种元件的控制回路被集成。 增益控制机制允许精确调整输出发射功率电平。 提供控制机制以在不需要时将功率放大器或整个发射信号路径断电。 控制发射信号路径中的各种元件的增益以减少输出发射功率的瞬变，并且还确保瞬变是向下的。