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公开(公告)号：US4553060A
公开(公告)日：1985-11-12
申请号：US553614
申请日：1983-11-21
摘要： A torsional-mode resonator is produced by using an extensional mode transducer on a piece of material such as a metal bar where the transducer lies at an angle between the longitudinal axis of the material and the transverse axis. Placing the midpoint of the transducer at approximately the midpoint of the material such as the bar, optimizes the torsional effect. Further optimization may be obtained by making the transducer in the shape of a rhomboid.
摘要翻译： 通过在一块材料（例如金属棒）上使用拉伸模式换能器来产生扭转模式谐振器，其中换能器位于材料的纵向轴线与横向轴线之间的角度处。 将传感器的中点放置在材料（如棒）的大致中点处，可优化扭转效应。 通过将换能器制成菱形的形状可以获得进一步的优化。
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公开(公告)号：US09071325B2
公开(公告)日：2015-06-30
申请号：US13232873
申请日：2011-09-14
CPC分类号： H04B1/1638 , H04B1/006 , H04B1/1018
摘要： A low noise receiver includes a downconverter configured to receive a radio frequency (RF) signal, the downconverter comprising a switching architecture configured to generate a plurality of output phases based on a respective plurality of local oscillator (LO) signals, a differencing circuit configured to combine the plurality of output phases such that an nth output phase is differenced with an (n+K)th output phase, resulting in gain-added output phases, and a summation filter configured to receive the gain-added output phases and configured to combine the gain-added output phases such that a response of the receiver effectively reduces odd harmonics of the RF signal.
摘要翻译： 低噪声接收器包括被配置为接收射频（RF）信号的下变频器，所述下变频器包括被配置为基于相应的多个本地振荡器（LO）信号产生多个输出相位的开关结构;差分电路，被配置为 组合多个输出相位，使得第n个输出相位与第（n + K）个输出相位差，产生增益输出相位，以及相加滤波器，被配置为接收增益输出相位并被配置为组合 增益输出相位使得接收器的响应有效地降低了RF信号的奇次谐波。
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3.发明授权公开(公告)号：US08693959B1
公开(公告)日：2014-04-08
申请号：US09621407
申请日：2000-07-21
IPC分类号： H04B1/40
CPC分类号： H03C3/0966 , H03C3/0941 , H03C3/0958 , H03D3/007 , H04B1/30 , H04B1/408 , H04L27/20
摘要： A system for transmitting and receiving data is provided. The system includes a direct-conversion receiver that receives a signal modulated on a carrier frequency signal. The direct-conversion receiver includes one or more subharmonic local oscillator mixers. A local oscillator is connected to the direct conversion receiver, and generates a signal having a frequency equal to a subharmonic of the carrier frequency signal. A transmitter is connected to the local oscillator, which uses the local oscillator signal to transmit outgoing data.
摘要翻译： 提供了一种用于发送和接收数据的系统。 该系统包括接收在载波频率信号上调制的信号的直接转换接收机。 直接转换接收器包括一个或多个次谐波本地振荡器混频器。 本地振荡器连接到直接转换接收器，并且产生具有等于载波频率信号的次谐波的频率的信号。 发送器连接到本地振荡器，其使用本地振荡器信号来发送输出数据。
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4.发明授权Continuous closed-loop power control system including modulation injection in a wireless transceiver power amplifier 有权连续闭环功率控制系统，包括无线收发器功率放大器中的调制注入公开(公告)号：US07218951B2
公开(公告)日：2007-05-15
申请号：US10885162
申请日：2004-07-06
CPC分类号： H04W52/52 , H03F1/0272 , H03F2200/294 , H03F2200/372 , H04B2001/0416
摘要： A single continuous closed-loop power control feedback system provides seamless power control for a power amplifier and also enables an AM signal to be injected into the power amplifier through the power amplifiers' control port. The AM signal is developed by an I/Q modulator and supplied to a comparator located in the power control loop. By using leakage from the power amplifier as feedback to a phase locked loop during initial power amplifier power ramp-up, the single continuous closed-loop power control system provides continuous feedback to the phase locked loop during the entire power amplification ramp-up period and eliminates the need for multiple feedback loops.
摘要翻译： 单个连续闭环功率控制反馈系统为功率放大器提供无缝功率控制，并且还可以通过功率放大器的控制端口将AM信号注入功率放大器。 AM信号由I / Q调制器开发，并提供给位于功率控制回路中的比较器。 在初始功率放大器功率提升期间，通过使用来自功率放大器的泄漏作为对锁相环的反馈，单个连续闭环功率控制系统在整个功率放大加速周期期间向锁相环提供连续反馈，并且 消除了对多个反馈环路的需要。
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公开(公告)号：US07103127B2
公开(公告)日：2006-09-05
申请号：US09823316
申请日：2001-03-30
CPC分类号： H03L7/099 , H03B2201/025 , H03B2201/0291 , H03J2200/10 , H03L5/00 , H03L7/087 , H03L7/113
摘要： Systems for controlling the frequency of the output signal of a controllable oscillator in a frequency synthesizer are provided. One such system comprises a controllable oscillator and a frequency control circuit. The controllable oscillator is configured to generate an output signal that has a predefined frequency. The controllable oscillator is also configured with a plurality of operational states that are controlled by the frequency control circuit. Each operational state of the controllable oscillator defines a distinct frequency for the output signal of the controllable oscillator. The frequency control circuit receives the output signal of the controllable oscillator and determines the distinct frequency for the output signal that best approximates the predefined frequency. The frequency control circuit may also provide a control signal to the controllable oscillator that is configured to change the controllable oscillator to the operational state corresponding to the distinct frequency that best approximates the predefined frequency.
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6.发明授权Wireless transmitter incorporating a synchronous oscillator in a translation loop 有权无线发射器在平移环路中并入同步振荡器公开(公告)号：US06961547B2
公开(公告)日：2005-11-01
申请号：US10233231
申请日：2002-08-30
CPC分类号： H04B1/04
摘要： A translation loop signal upconverter is disclosed. Embodiments of the invention minimize nth order harmonics and spurious tones in the radio frequency output spectrum of a portable transceiver. In one embodiment, the invention is a signal upconverter, comprising a modulator configured to develop a modulated intermediate frequency (IF) signal at a fundamental frequency, the modulated IF signal also including a plurality of nth order components, a synchronous oscillator configured to receive the modulated IF signal, the synchronous oscillator also configured to operate at the fundamental frequency of the modulated IF signal, thereby providing an IF signal substantially free of the nth order components, and a translation loop having a phase locked loop, the translation loop configured to receive the IF signal output of the synchronous oscillator, and supply a radio frequency (RF) output signal to a power amplifier.
摘要翻译： 公开了一种平移环路信号上变频器。 本发明的实施例使便携式收发器的射频输出频谱中的第n级次谐波和伪噪声最小化。 在一个实施例中，本发明是一种信号上变频器，包括调制器，其被配置为开发基频的调制中频（IF）信号，调制IF信号还包括多个第n个次级分量 配置成接收所述经调制的IF信号的同步振荡器，所述同步振荡器还被配置为在所述调制IF信号的基频处工作，由此提供基本上不含所述第n个次级分量的IF信号， 以及具有锁相环的平移环路，所述平移环路被配置为接收所述同步振荡器的IF信号输出，并将射频（RF）输出信号提供给功率放大器。
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公开(公告)号：US06697613B1
公开(公告)日：2004-02-24
申请号：US09634081
申请日：2000-08-08
IPC分类号： H04B110
CPC分类号： H04B1/1036
摘要： A system for reducing internal interference in a radio-frequency (RF) receiver includes providing a plurality of time slots within a frame where the receiver is configured to receive external RF signals during a receive time slot within the frame. Data is collected during a receive time slot of a frame, and a receive data value is calculated corresponding to the collected data. A predetermined portion of the data collected is inspected, and a bias data value is calculated. The bias value is attributable to interference signals caused by the internal interference. The bias data value is added to an accumulator, and over time, a running average of the bias data values is determined. A portion of the running average is subtracted from the sample stream of data to provide output data corresponding to the external RF signals absent the internal interference.
摘要翻译： 用于减少射频（RF）接收机内部干扰的系统包括在帧内提供多个时隙，其中接收机被配置为在帧内的接收时隙期间接收外部RF信号。 在帧的接收时隙期间收集数据，并且对应于所收集的数据计算接收数据值。 检查收集的数据的预定部分，并计算偏差数据值。 偏置值归因于由内部干扰引起的干扰信号。 偏置数据值被添加到累加器，并且随着时间的推移，确定偏置数据值的运行平均值。 从采样数据流中减去运行平均值的一部分，以提供对应于不存在内部干扰的外部RF信号的输出数据。
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公开(公告)号：US06466069B1
公开(公告)日：2002-10-15
申请号：US09718615
申请日：2000-11-21
IPC分类号： H03L706
CPC分类号： H03L7/107 , H03L7/0898 , H03L7/1072 , H03L7/18 , H03L7/1974
摘要： This invention provides a charge pump biasing circuit that varies the bias when the phase lock loop changes frequency to improve the settling time of the phase lock loop. During a frequency change, the charge pump output current taper off as the phase lock loop approaches the desired frequency. The charge pump biasing circuit allows the phase lock loop to change frequencies faster and minimizes spurious sideband noise once the loop has settled.
摘要翻译： 本发明提供一种电荷泵偏置电路，其在锁相环改变频率时改变偏压，以改善锁相环的稳定时间。 在频率变化期间，当锁相环接近所需频率时，电荷泵输出电流逐渐减小。 电荷泵偏置电路允许锁相环更快地改变频率，并且一旦环路已经稳定就最小化杂散边带噪声。
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公开(公告)号：US06360087B1
公开(公告)日：2002-03-19
申请号：US09260919
申请日：1999-03-02
IPC分类号： H04B106
CPC分类号： H04B1/406 , H03D3/006 , H03D7/1408 , H03D7/1433 , H03D7/1458 , H03D7/1491 , H03D2200/0047 , H03D2200/009 , H04B1/30
摘要： A direct conversion receiver system is provided in which a first input signal at a first frequency is applied to a first input port of a multiplier, a second input signal at a second frequency equal to about {fraction (1/n)} times the first frequency, wherein n is an integer, is applied to a second input port of the multiplier. A first filter coupled to the first input port is configured to substantially filter out any leakage at the second frequency which may be present. A second filter coupled to the second input port is configured to substantially filter out any leakage at the first frequency which may be present. The multiplier is configured to produce a signal at an output port thereof which is derived from the product of the first and second signals. In one embodiment, the output is representative of the product of the filtered first signal and a multiplication factor which switches at n times the second frequency. The output of the multiplier is coupled to a third filter. The output signal has a baseband component and another component. The third filter is configured to substantially filter out the other component and substantially maintain the baseband component in the output signal. In one implementation example, the multiplier is a mixer initializing half-frequency injection, such that the LO frequency is about ½ the RF frequency.
摘要翻译： 提供一种直接转换接收机系统，其中以第一频率的第一输入信号被施加到乘法器的第一输入端口，第二频率的第二输入信号等于第一频率的大约{分数（1 / n）}倍） 频率，其中n是整数，被施加到乘法器的第二输入端口。 耦合到第一输入端口的第一滤波器被配置为基本上滤除可能存在的第二频率处的任何泄漏。 耦合到第二输入端口的第二滤波器被配置为基本上滤除可能存在的第一频率处的任何泄漏。 乘法器被配置为在其输出端口处产生从第一和第二信号的乘积导出的信号。 在一个实施例中，输出代表滤波后的第一信号和在第二频率n倍切换的乘法因子的乘积。 乘法器的输出耦合到第三个滤波器。 输出信号具有基带分量和另一分量。 第三滤波器被配置为基本上滤除另一分量并且基本上保持输出信号中的基带分量。 在一个实施例中，乘法器是混频器初始化半频率注入，使得LO频率约为RF频率的1/2。
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公开(公告)号：US20120063555A1
公开(公告)日：2012-03-15
申请号：US13232873
申请日：2011-09-14
IPC分类号： H04B1/10
CPC分类号： H04B1/1638 , H04B1/006 , H04B1/1018
摘要： A low noise receiver includes a downconverter configured to receive a radio frequency (RF) signal, the downconverter comprising a switching architecture configured to generate a plurality of output phases based on a respective plurality of local oscillator (LO) signals, a differencing circuit configured to combine the plurality of output phases such that an nth output phase is differenced with an (n+K)th output phase, resulting in gain-added output phases, and a summation filter configured to receive the gain-added output phases and configured to combine the gain-added output phases such that a response of the receiver effectively reduces odd harmonics of the RF signal.
摘要翻译： 低噪声接收器包括被配置为接收射频（RF）信号的下变频器，所述下变频器包括被配置为基于相应的多个本地振荡器（LO）信号产生多个输出相位的开关结构;差分电路，被配置为 组合多个输出相位，使得第n个输出相位与第（n + K）个输出相位差，产生增益输出相位，以及相加滤波器，被配置为接收增益输出相位并被配置为组合 增益输出相位使得接收器的响应有效地降低了RF信号的奇次谐波。
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