公开(公告)号：US5467091A

公开(公告)日：1995-11-14

申请号：US278214

申请日：1994-07-21

申请人： Grant H. Watkins ,  Stephen P. Caldwell

发明人： Grant H. Watkins ,  Stephen P. Caldwell

IPC分类号： G01S13/02 ,  G01S13/53 ,  H03D7/16 ,  H04B1/40 ,  G01S13/524

CPC分类号： H03D7/163 ,  G01S13/0209 ,  G01S13/53 ,  H04B1/403

摘要： A large bandwidth communication system has a transmitter to transmit signals over a selectable frequency operating range and a receiver having a first mixer for mixing an LO1 signal with received transmit signals. The receiver has a first IF for processing signals received from the first mixer. A frequency synthesizer generates frequency signals for application to at least a transmit mixer in the transmitter and to at least the first mixer in the receiver. A computer system selects and applies a modified frequency value to at least one of plural frequencies used in the system that of the LO1 signal applied to the first mixer, that of a frequency signal applied to the transmit mixer, and an IF frequency of the first IF, with the modified frequency value selected as a function of the system operating frequency and stored spurious amplitude data so as to sidestep spurious signals in portions of the total system frequency operating bandwidth where spurious amplitudes are excessive and otherwise would interfere with quality reception.

摘要翻译： 大带宽通信系统具有用于在可选频率工作范围内传输信号的发射机和具有用于将LO1信号与接收到的发射信号混合的第一混频器的接收机。 接收机具有用于处理从第一混频器接收的信号的第一IF。 频率合成器产生用于应用于发射机中的至少一个发射混频器并且至少在接收机中的第一混频器的频率信号。 计算机系统选择并将修改的频率值应用于系统中施加到第一混频器的LO1信号中使用的多个频率中的至少一个，施加到第一混频器的频率信号的频率值以及第一混频器的IF频率 IF，其中修改的频率值被选择为系统工作频率和存储的寄生振幅数据的函数，以便在总体系统频率工作带宽中部分地偏置杂散信号，其中寄生振幅过大，否则将干扰质量接收。

公开(公告)号：US5166629A

公开(公告)日：1992-11-24

申请号：US714403

申请日：1991-04-26

申请人： Grant H. Watkins ,  John P. Muhlbaier

发明人： Grant H. Watkins ,  John P. Muhlbaier

IPC分类号： H03B21/01 ,  H03B21/04

CPC分类号： H03B21/01 ,  H03B21/04

摘要： A direct frequency synthesizer is provided with a single stage or multiple cascaded stages. Each stage includes a fixed frequency input channel and a selectable frequency input channel which are coupled respectively to the I and L ports of a mixer. The input channel includes a divider having a divisor equal to N. The selectable frequencies range from f.sub.1 to f.sub.1 +j.theta.. Single-pole-multiple-throw switches selectively connect the fixed and selectable frequencies to the mixer to generate output frequency signals through an output filter bank. Specific relationships among N, n and .theta. are used to establish continuous output frequency coverage, stage cascadability and other synthesizer operating features.

摘要翻译： 直接频率合成器具有单级或多级联级。 每个级包括分别耦合到混频器的I和L端口的固定频率输入通道和可选频率输入通道。 输入通道包括具有等于N的除数的分频器。可选择的频率范围从f1到f1 + j。 单极多掷开关选择性地将固定和可选择的频率连接到混频器，以通过输出滤波器组产生输出频率信号。 N，n和theta之间的具体关系用于建立连续的输出频率覆盖，阶段级联和其他合成器的操作特性。

公开(公告)号：US4684904A

公开(公告)日：1987-08-04

申请号：US816596

申请日：1986-01-06

申请人： Grant H. Watkins ,  Lester K. Staley

发明人： Grant H. Watkins ,  Lester K. Staley

IPC分类号： H03B1/00 ,  H03B1/04 ,  H03B5/18 ,  H03B5/12

CPC分类号： H03B5/1847 ,  H03B2200/004 ,  H03B2200/0088 ,  H03B2201/0208 ,  H03B2202/017 ,  H03B2202/027

摘要： A low noise two port voltage controlled oscillator having a coarse tuning circuit serially connected to an inductor to form a resonant circuit. A fine tuning circuit is serially connected between the resonant circuit and the input to the amplifier. A large capacitance series silicon varactor minimizes noise at the frequency of operation while optimizing the coarse tuning range.

摘要翻译： 低噪声双端口压控振荡器，其具有串联连接到电感器的粗调谐电路以形成谐振电路。 在谐振电路和放大器的输入端之间串联一个微调电路。 大电容串联硅变容二极管使工作频率下的噪声最小化，同时优化粗调范围。

公开(公告)号：US07570201B1

公开(公告)日：2009-08-04

申请号：US10981696

申请日：2004-11-05

申请人： Grant H. Watkins ,  Stephen P. Caldwell

发明人： Grant H. Watkins ,  Stephen P. Caldwell

IPC分类号： G01S7/40

CPC分类号： G01S7/4008

摘要： Phase compensation for the phase non-linearities introduced by the filters, amplifiers, and other microwave devices included in waveform generators in a radar system is achieved by first measuring the phase errors over a predetermined frequency range which are then fed to a pair of digital random access memories (RAMs), whereupon phase predistortion commands for both the local oscillator signal used to generate the RF transmit signal and the phase non-linearity in the RF transmit signal itself are called up and applied by first applying a predistortion phase shift to the local oscillator signal when it is being generated and secondly by applying a second predistortion phase shift when the RF transmit signal is being generated.

摘要翻译： 由雷达系统中的波形发生器中包括的滤波器，放大器和其他微波器件引入的相位非线性的相位补偿通过首先测量预定频率范围上的相位误差来实现，然后将其馈送到一对数字随机 访问存储器（RAM），因此，用于产生RF发射信号的本地振荡器信号和RF发射信号本身的相位非线性的相位预失真命令被调用并应用，首先将预失真相移施加到本地 振荡器信号，其次在产生RF发射信号时通过施加第二预失真相移。

公开(公告)号：US5661439A

公开(公告)日：1997-08-26

申请号：US680287

申请日：1996-07-11

申请人： Grant H. Watkins ,  Stephen P. Caldwell ,  Matthew Martello ,  John P. Muhlbaier

发明人： Grant H. Watkins ,  Stephen P. Caldwell ,  Matthew Martello ,  John P. Muhlbaier

IPC分类号： H03B1/04 ,  H03L7/02 ,  H03B28/00 ,  H03L7/00

CPC分类号： H03B1/04 ,  H03L7/02 ,  H03B2202/027 ,  H03B2202/076

摘要： A frequency oscillator and a frequency multiplier multiplying the signals from the oscillator contain inherent phase noise. A phase noise canceller removes phase noise, due to both the oscillator and the multiplier, by inserting a delay in one path and comparing phases of the delayed signal and the undelayed signal. This comparison may be either fed back to the tuning port of the oscillator or fed forward to a phase shifter which shakes off the phase noise. The delay may include a delay line, a cavity or any other suitable device which produces a phase shift. The phase noise canceller may also be designed to remove the total phase noise of the system, including additive phase noise from sources other than the oscillator and multiplier. The canceller may be calibrated and may be designed to reduce periodic response thereof.

摘要翻译： 将来自振荡器的信号相乘的频率振荡器和倍频器包含固有的相位噪声。 相位噪声消除器通过在一个路径中插入延迟并且比较延迟信号和未延迟信号的相位来消除由于振荡器和乘法器两者引起的相位噪声。 该比较可以被反馈到振荡器的调谐端口，或者被馈送到移相器，其移除相位噪声。 延迟可以包括延迟线，空腔或产生相移的任何其它合适的装置。 相位噪声消除器还可以被设计为去除系统的总相位噪声，包括来自振荡器和乘法器之外的源的相位相位噪声。 消除器可以被校准，并且可以被设计为减少其周期性响应。

公开(公告)号：US5596290A

公开(公告)日：1997-01-21

申请号：US607924

申请日：1996-02-28

申请人： Grant H. Watkins ,  Norman G. Matthews ,  Aldez C. Hazzard ,  John P. Muhlbaier

发明人： Grant H. Watkins ,  Norman G. Matthews ,  Aldez C. Hazzard ,  John P. Muhlbaier

IPC分类号： H03B21/02 ,  H03B21/04 ,  H03B21/00 ,  H03B19/00 ,  H03K21/00

CPC分类号： H03B21/025 ,  H03B21/04

摘要： A low cost direct frequency synthesizer is structured to operate with moderate bandwidth, good noise performance, superior spurious performance, and fast switching. The direct frequency synthesizer employs a starter frequency signal f.sub.o (33-1) and a set of LO frequency signals f.sub.1 through f.sub.n (35-1) spaced from each other by a frequency increment .delta.. A mixer circuit (34-1) generates a product of the starter frequency signal and the LO frequency signals. A divider (31-1) has a divider ratio equal to N. The number of LO frequency signals is equal to or less than N. The starter frequency f.sub.o has a value equal to .delta. times (N+x) where x is equal to 0 or a positive integer. The LO frequency f.sub.1 has a value equal to (N+1)f.sub.o. An intermediate nonswitchable band pass filter (36-1) passes a difference portion of the mixer product to the divider, and a nonswitchable output band pass filter (38-1) receives an output from the divider to generate a moderate bandwidth output.

摘要翻译： 低成本的直接频率合成器被构造为以适中带宽，良好的噪声性能，优异的杂散性能和快速切换运行。 直接频率合成器采用启动频率信号fo（33-1）和一组LO频率信号f1至fn（35-1），彼此间隔一个频率增量delta。 混频器电路（34-1）产生起动频率信号和LO频率信号的乘积。 分频器（31-1）具有等于N的分频比.L0频率信号的数量等于或小于N.起动器频率fo具有等于Δ时间（N + x）的值，其中x等于 0或正整数。 LO频率f1具有等于（N + 1）fo的值。 中间不可切换带通滤波器（36-1）将混频器产品的差分部分传递到分频器，并且不可切换输出带通滤波器（38-1）接收来自分频器的输出以产生中等带宽输出。

公开(公告)号：US4323798A

公开(公告)日：1982-04-06

申请号：US141501

申请日：1980-04-18

申请人： Grant H. Watkins

发明人： Grant H. Watkins

IPC分类号： G11C27/02 ,  H03F3/72 ,  H03H11/12 ,  H03F1/36

CPC分类号： H03H11/1291 ,  G11C27/026 ,  H03F3/72

摘要： Faster switching speeds for switchable noise filters and faster sampling speeds for sample and hold circuits are realized by means of an operational amplifier driven circuit in which excess feedback loop gain of the operational amplifier is used to reduce the effective value of resistance in the device's capacitor charging circuit. Two operational feedback loops are used, one or the other of which is switched into the circuit to effect either an open loop or a closed loop condition. The time required to charge the device's capacitor is a function of the ratio of the operational amplifier's closed loop gain divided by its open loop gain.

摘要翻译： 通过运算放大器驱动电路实现可切换噪声滤波器的切换速度更快，采样和保持电路的采样速度更快，其中运算放大器的多余反馈环路增益用于降低器件电容充电中的电阻有效值 电路。 使用两个操作反馈回路，其中一个或另一个被切换到电路中以实现开环或闭环状态。 对器件电容充电所需的时间是运算放大器的闭环增益除以其开环增益的比率的函数。