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1.发明授权Self-attenuating RF transceiver system using antenna and modem interfaces and cable link 失效自衰减RF收发系统采用天线和调制解调器接口和电缆链路
公开(公告)号：US5737687A
公开(公告)日：1998-04-07
申请号：US398619
申请日：1995-03-01
CPC分类号： H04W52/52 , H04B1/3877
摘要： A transceiver system for interfacing digital modems with radio frequency signals including an antenna, an antenna interface system and a modem interface system separated by a cable. The antenna is placed in a location having optimal reception and in close proximity to the antenna interface system. The cable couples the antenna interface system to the modem interface system. The modem interface system includes a two state variable attenuator and an attenuation register that are configured to either reduce the strength of the receive (Rx) signal when the modems are located near a base station, or to transmit the Rx signal without attenuation when the concentrated subscriber unit is at a more distant location. The outgoing, or transmit (Tx), signal is also attenuated in a similar manner to the incoming signal. A signal loss detection system includes a detector located in the modem interface system that receives an oscillating signal transmitted from the antenna interface system through the coaxial cable. A differentiating integrator then determines the amount of signal loss experienced by this oscillating signal during transmission through the coaxial cable and attenuates the signal from the antenna interface system accordingly so the amount of loss experienced remains constant. DC power is transmitted from the modem interface system to the antenna interface system through the coaxial cable. A maximum power limiting system detects when the signal being generated exceeds the capacity of the transmit power amplifier and transmits an alarm signal to the modem interface system.
摘要翻译： 用于将数字调制解调器与包括由电缆隔开的天线，天线接口系统和调制解调器接口系统的射频信号进行接口的收发机系统。 将天线放置在具有最佳接收并且靠近天线接口系统的位置。 电缆将天线接口系统耦合到调制解调器接口系统。 调制解调器接口系统包括两个状态可变衰减器和一个衰减寄存器，其被配置为当调制解调器位于基站附近时降低接收（Rx）信号的强度，或者当集中 用户单元处于更远的位置。 输出或发送（Tx）信号也以与输入信号相似的方式衰减。 信号丢失检测系统包括位于调制解调器接口系统中的检测器，其接收通过同轴电缆从天线接口系统发送的振荡信号。 然后，微分积分器确定在通过同轴电缆传输期间该振荡信号所经历的信号损耗的量，并相应地衰减来自天线接口系统的信号，因此所经历的损耗量保持恒定。 直流电源通过同轴电缆从调制解调器接口系统传输到天线接口系统。 最大功率限制系统检测何时产生的信号超过发射功率放大器的容量，并向调制解调器接口系统发送报警信号。
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公开(公告)号：US5442322A
公开(公告)日：1995-08-15
申请号：US315540
申请日：1994-09-30
CPC分类号： H03F1/306 , H03F1/0261
摘要： A control circuit for a multi-stage power amplifier (such as in a portable radio transmitter) compensates for fluctuations in ambient temperature, load, signal level and power supply voltage, The control voltage is set by comparing a biasing level which is related to the amplifier input signal level to a voltage proportional to the power supply current of the last stage of the amplifier. The control voltage resulting from the comparison establishes the operating point of the last stage of the power amplifier.
摘要翻译： 用于多级功率放大器（例如在便携式无线电发射机中）的控制电路补偿环境温度，负载，信号电平和电源电压的波动。控制电压通过比较与 放大器输入信号电平与放大器最后一级的电源电流成正比。 由比较产生的控制电压建立功率放大器最后一级的工作点。
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公开(公告)号：USD361065S
公开(公告)日：1995-08-08
申请号：US17464
申请日：1994-01-14
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公开(公告)号：US5722053A
公开(公告)日：1998-02-24
申请号：US683004
申请日：1996-07-16
IPC分类号： H04B1/40 , H04B1/38 , H04B7/005 , H04B7/12 , H04B7/208 , H04B7/26 , H04J1/04 , H04L1/04 , H04L5/06 , H04Q11/02 , H04W36/14 , H04W36/18 , H04B1/50
摘要： The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive. The transmit path operates by splitting the transmit intermediate frequency (IF) path (103) and mixing the IF to two different transmit frequencies using two frequency synthesizers (140 and 145). The receive path (104) has two RF channels (116 and 117) that are mixed with the frequencies generated by the synthesizers (140 and 145) and summed into one IF strip. Thus the radio of the present invention can perform a soft hand-off between frequencies while communicating with both base stations simultaneously. Additional mixing paths and synthesizers can be added if it is desired to communicate with more than two base stations simultaneously.
摘要翻译： 本发明的双频带码分多址无线电在传输或接收的同时在多个频率上工作。 发射路径通过分离发射中频（IF）路径（103）并使用两个频率合成器（140和145）将IF混合到两个不同的发射频率来操作。 接收路径（104）具有与由合成器（140和145）生成的频率混合的两个RF信道（116和117）并且相加到一个IF条带中。 因此，本发明的无线电装置可以同时在与两个基站通信的同时执行软切换。 如果需要同时与两个以上的基站进行通信，则可以添加其他混合路径和合成器。
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5.发明授权Reverse link, transmit power correction and limitation in a radiotelephone system 失效无线电话系统中的反向链路，发射功率校正和限制
公开(公告)号：US5452473A
公开(公告)日：1995-09-19
申请号：US203151
申请日：1994-02-28
摘要： The process and apparatus of the present invention limits the output power of a radiotelephone, operating in a cellular system in the preferred embodiment. This ensures the transmitted sidebands and synthesizer phase noise remains within a certain specification. This is accomplished by power detection and a correction accumulator that together generate a gain control signal by limiting the gain adjustment to a maximum value, even when the cell site communicating with the radiotelephone is sending power turn-up commands to the radiotelephone. This process includes dynamically correcting the output level of the transmitter due to gain variations in the transmitter stages or gain control elements.
摘要翻译： 本发明的方法和装置限制在优选实施例中在蜂窝系统中操作的无线电话机的输出功率。 这确保传输的边带和合成器相位噪声保持在一定的规格内。 这通过功率检测和校正累加器来实现，即使当与无线电话机通信的小区站点向无线电话机发送功率开启命令时，通过将增益调整限制为最大值来一起生成增益控制信号。 该过程包括由于发射机级或增益控制元件中的增益变化而动态校正发射机的输出电平。
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公开(公告)号：US5974041A
公开(公告)日：1999-10-26
申请号：US579169
申请日：1995-12-27
IPC分类号： H03F99/00 , H03F1/02 , H03F1/32 , H03F3/60 , H03F3/68 , H03F3/72 , H03G3/02 , H03G3/30 , H04B1/04 , H04B7/26 , H04J13/00
CPC分类号： H03F3/211 , H03F1/0277 , H03F1/0288 , H03F3/602 , H03F3/72 , H03G3/3042 , H04B1/0483 , H03F2200/294 , H03F2203/7236 , H04B2001/0408
摘要： An amplifier circuit for providing an amplified signal in response to an input signal. The amplifier circuit includes an input network for applying the input signal to a selected at least one of a plurality of amplifier stages. An output network is provided for coupling the amplified signal from the selected at least one amplifier stage. The appropriate amplifier stage is selected by a control circuit in response to a desired power value of the amplified signal. By selectively activating only the amplifier stage(s) that are necessary to provide the desired level of output power, increased DC efficiency can be accomplished in applications that require an amplifier which operates linearly over a wide dynamic range.
摘要翻译： 一种用于响应于输入信号提供放大信号的放大器电路。 放大器电路包括用于将输入信号施加到所选择的多个放大器级中的至少一个的输入网络。 提供输出网络用于耦合来自所选择的至少一个放大器级的放大信号。 响应于放大信号的期望功率值，控制电路选择合适的放大器级。 通过选择性地仅激活提供期望电平的输出功率所需的放大器级，可以在需要在宽动态范围内线性运行的放大器的应用中实现增加的DC效率。
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7.发明授权Reverse link, transmit power correction and limitation in a radiotelephone system 失效无线电话系统中的反向链路，发射功率校正和限制
公开(公告)号：US5655220A
公开(公告)日：1997-08-05
申请号：US532383
申请日：1995-09-22
摘要： The process and apparatus of the present invention limits the output power of a radiotelephone, operating in a cellular system in the preferred embodiment. This ensures the transmitted sidebands and synthesizer phase noise remains within a certain specification. This is accomplished by power detection and a correction accumulator that together generate a gain control signal by limiting the gain adjustment to a maximum value, even when the cell site communicating with the radiotelephone is sending power turn-up commands to the radiotelephone. This process includes dynamically correcting the output level of the transmitter due to gain variations in the transmitter stages or gain control elements.
摘要翻译： 本发明的方法和装置限制在优选实施例中在蜂窝系统中操作的无线电话机的输出功率。 这确保传输的边带和合成器相位噪声保持在一定的规格内。 这通过功率检测和校正累加器来实现，即使当与无线电话机通信的小区站点向无线电话机发送功率开启命令时，通过将增益调整限制为最大值来一起产生增益控制信号。 该过程包括由于发射机级或增益控制元件中的增益变化而动态校正发射机的输出电平。
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公开(公告)号：US5590408A
公开(公告)日：1996-12-31
申请号：US407543
申请日：1995-03-20
摘要： The process and apparatus of the present invention limits the output power of a radiotelephone, operating in a cellular system in the preferred embodiment. This ensures the transmitted sidebands and synthesizer phase noise remains within a certain specification. This is accomplished by power detection and a correction accumulator that together generate a gain control signal by limiting the gain adjustment to a maximum value, even when the cell site communicating with the radiotelephone is sending power turn-up commands to the radiotelephone. This process includes dynamically correcting the output level of the transmitter due to gain variations in the transmitter stages or gain control elements.
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公开(公告)号：US5339046A
公开(公告)日：1994-08-16
申请号：US72303
申请日：1993-06-03
摘要： An amplifier for a radio transceiver overcomes the problem of gain being dependent on ambient temperature. Transmission power is matched to strength of a received signal by providing matched dual gate FET amplifier stages in both the transmitter and receiver portions of the transceiver. Changes in gain due to temperature are compensated for by detecting changes in the FET drain current by measuring the source voltage of the amplifier. The FET source voltage is compared to a reference voltage, and the output signal resulting from the comparison is provided as a control signal to one of the FET gates.
摘要翻译： 用于无线电收发器的放大器克服了增益取决于环境温度的问题。 通过在收发器的发射器和接收器部分中提供匹配的双栅极FET放大器级，发射功率与接收信号的强度相匹配。 通过测量放大器的源极电压来检测FET漏极电流的变化来补偿由温度引起的增益变化。 将FET源极电压与参考电压进行比较，并将从比较得到的输出信号作为控制信号提供给FET栅极之一。
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公开(公告)号：US5930692A
公开(公告)日：1999-07-27
申请号：US855724
申请日：1997-05-09
IPC分类号： H04B1/06 , H03G1/00 , H03G3/30 , H04B20060101 , H04B1/10 , H04B1/16 , H04B1/18 , H04B1/40 , H04B1/7075 , H04B1/7097 , H04B3/06 , H04B7/005 , H04B7/26 , H04B15/00
CPC分类号： H04W52/52 , H03F3/72 , H03G1/0088 , H03G3/3052 , H03G3/3068 , H04B1/109 , H04B1/70755 , H04B1/7097 , H03F2203/7239 , Y02B60/50
摘要： The method and apparatus of the present invention improve the immunity to interference of a radio receiver. The power level of a received signal is detected. If the power level meets or exceeds a predetermined power threshold, the low noise amplifier is by-passed, thus increasing the intercept point of the receiver components.Alternative embodiments include the use of an RF power detector to control the front-end gain as a function of jammer power. In lieu of a switchable RF gain block, several methods of continuous gain control are proposed. Continuous gain control allows the interference suppression and sensitivity of the receiver to be adjusted at lower signal levels than the switchable gain block.
摘要翻译： 本发明的方法和装置提高了无线电接收机的抗干扰能力。 检测到接收信号的功率电平。 如果功率电平满足或超过预定功率阈值，则低噪声放大器被旁路，从而增加了接收器组件的截取点。 替代实施例包括使用RF功率检测器来控制作为干扰功率的函数的前端增益。 代替可切换的RF增益块，提出了几种连续增益控制方法。 连续增益控制允许在比可切换增益块更低的信号电平下调整接收机的干扰抑制和灵敏度。
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