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1. 发明授权

US06690177B2 Frequency selective improvement of the directivity of a return loss bridge 失效
标题翻译：频率选择性提高回波桥的方向性
公开(公告)号：US06690177B2
公开(公告)日：2004-02-10
申请号：US10087261
申请日：2002-03-01
申请人： Donald J. Dalebroux
发明人： Donald J. Dalebroux
IPC分类号： G01R2704
CPC分类号： H01P5/16 , H03H7/38
摘要： A frequency selective improved directivity of a return loss bridge is achieved by generating a counteractive reflected energy vector to cancel a reflected energy vector caused by imperfections, such as parasitic effects and an unbalanced balun, in the return loss bridge. The counteractive reflected energy vector of equal magnitude, but opposite in phase, to the undesired reflected energy vector may be induced into a transmission path between a test port and a coupled port. An open circuit stub in the transmission path between the test port and the coupled port may be used to provide the counteractive reflected energy vector. Alternatively a path across a coupling resistor in a return loss path coupled from the test port to the coupled port may be used to provide the counteractive reflected energy vector, with PIN diodes in the coupled path being used for tunability if desired.
摘要翻译：回波损耗桥的频率选择性改善的方向性通过产生抵消反射能量向量来实现，以消除由回波损耗桥中的诸如寄生效应和不平衡 - 不平衡转换器之类的不均匀性引起的反射能量矢量。相等幅度但与相反相反的不利反射能量矢量的反作用反射能量矢量可能被引入测试端口和耦合端口之间的传输路径。可以使用测试端口和耦合端口之间的传输路径中的开路短路来提供反作用的反射能量矢量。或者，可以使用从测试端口耦合到耦合端口的返回损耗路径中的耦合电阻器的路径来提供反向反射能量向量，如果需要，耦合路径中的PIN二极管用于可调谐性。

2. 发明授权

US07327992B2 Tracking generator with internal vector modulation source 有权
标题翻译：具有内部矢量调制源的跟踪发生器
公开(公告)号：US07327992B2
公开(公告)日：2008-02-05
申请号：US10692404
申请日：2003-10-22
申请人： Jeffrey D. Earls , Donald J. Dalebroux
发明人： Jeffrey D. Earls , Donald J. Dalebroux
IPC分类号： H03J7/32 , H04B1/18 , H04B1/16
CPC分类号： G01R27/32
摘要： A tracking generator for an RF measurement instrument having a receiver and a controller includes a vector modulator internal to the tracking generator. The internal vector modulator modulates complex baseband signals based on data from the controller to produce a vector modulation signal. The vector modulation signal is used to modulate a local oscillator frequency from the receiver in an output mixing stage to produce a test signal having an output frequency that matches a measurement frequency to which the receiver is tuned. By controlling the complex baseband data from the controller, an adaptive filter at the output of a DAC that produces an analog signal from the digitally modulated complex baseband data, an internal independent oscillator for the vector modulator, or a large offset phase-locked loop, an offset from the measurement frequency may be generated for the output frequency.
摘要翻译：用于具有接收器和控制器的RF测量仪器的跟踪发生器包括跟踪发生器内部的矢量调制器。内部矢量调制器基于来自控制器的数据来调制复基带信号以产生矢量调制信号。矢量调制信号用于在输出混频级中从接收器调制本地振荡器频率，以产生具有与接收机调谐到的测量频率匹配的输出频率的测试信号。通过控制来自控制器的复合基带数据，在DAC的输出处产生来自数字调制的复基带数据的模拟信号，矢量调制器的内部独立振荡器或大的偏移锁相环的自适应滤波器，对于输出频率可能产生与测量频率的偏移。

3. 发明授权

US06532358B1 Overload distortion protection for a wideband receiver 失效
标题翻译：宽带接收机的过载失真保护
公开(公告)号：US06532358B1
公开(公告)日：2003-03-11
申请号：US09631753
申请日：2000-08-03
申请人： Jeffrey D. Earls , Donald J. Dalebroux , Man-Kit Yau
发明人： Jeffrey D. Earls , Donald J. Dalebroux , Man-Kit Yau
IPC分类号： H04B106
CPC分类号： H03G3/3068 , H04B1/109
摘要： Overload distortion protection for a wideband receiver having a wideband variable gain input amplifier followed by a frequency conversion stage followed in turn by an intermediate frequency amplifier and detector to produce a measurement value in response to a signal input to the wideband variable gain input amplifier is achieved by detecting the peak power of the signal at the output of the wideband variable gain input amplifier and comparing it with the power output from the intermediate frequency amplifier and detector. If a threshold difference is exceeded, gain control signals for the wideband variable gain input and intermediate frequency amplifiers are adjusted for optimum dynamic range. If there is no range for adjusting the gain control signals, then a warning is provided to an operator to alert that the measurement value may contain distortion.
摘要翻译：实现具有宽带可变增益输入放大器的宽带接收机的过载失真保护，随后是频率转换级，随后由中频放大器和检测器响应于输入到宽带可变增益输入放大器的信号产生测量值通过检测宽带可变增益输入放大器的输出处的信号的峰值功率，并将其与来自中频放大器和检测器的功率输出进行比较。如果超过阈值差，则调整宽带可变增益输入和中频放大器的增益控制信号以获得最佳动态范围。如果没有用于调整增益控制信号的范围，则向操作者提供警告以警告测量值可能包含失真。

4. 发明申请

US20090209222A1 Conversion Architecture For Residual Spur Avoidance 审中-公开
标题翻译：残余支线避免转换架构
公开(公告)号：US20090209222A1
公开(公告)日：2009-08-20
申请号：US12032537
申请日：2008-02-15
申请人： Litong Li , Donald J. Dalebroux , Ronald J. Larrick
发明人： Litong Li , Donald J. Dalebroux , Ronald J. Larrick
IPC分类号： H04B1/26
CPC分类号： H03D7/161
摘要： A method and apparatus for residual spur avoidance is disclosed. One embodiment comprises a method of generating a first local oscillator signal, mixing the first local oscillator signal with a radio frequency signal to generate an intermediate frequency signal, filtering the intermediate frequency signal at a band-pass frequency, mixing the filtered intermediate frequency signal with a second local oscillator signal having a first frequency offset from the band-pass frequency to generate an output intermediate frequency signal, and switching the second local oscillator signal to a second frequency offset to avoid a spur generated from the first frequency offset, wherein the second frequency offset is the opposite sign but same magnitude offset from the band-pass frequency.
摘要翻译：公开了一种用于残余回波避免的方法和装置。一个实施例包括产生第一本地振荡器信号的方法，将第一本地振荡器信号与射频信号混合以产生中频信号，以带通频率对中频信号进行滤波，将滤波后的中频信号与第二本地振荡器信号具有从带通频率的第一频率偏移以产生输出中频信号，以及将第二本机振荡器信号切换到第二频率偏移以避免从第一频率偏移产生的杂散，其中第二本地振荡器信号频偏是相反的符号，但与带通频率的偏移量相同。

5. 发明授权

US06636722B1 Broadband receiver amplitude/phase normalization using a broadband temperature compensated noise source and a pseudo random sequence generator 失效
标题翻译：使用宽带温度补偿噪声源和伪随机序列发生器的宽带接收机幅度/相位归一化
公开(公告)号：US06636722B1
公开(公告)日：2003-10-21
申请号：US09660561
申请日：2000-09-12
申请人： Donald J. Dalebroux , Xiaofen Chen
发明人： Donald J. Dalebroux , Xiaofen Chen
IPC分类号： H04B1700
CPC分类号： H04B17/20
摘要： A method of broadband receiver amplitude/phase normalization uses internal normalization sources—a thermally compensated noise source and a pseudo random sequence generator. A calibrated signal is applied to the input of the broadband receiver and processed by a digital signal processor to generate a gain versus frequency table. Then the internal noise source is applied to the input of the broadband receiver and process by a digital signal processor to generate a noise level versus frequency table. Finally the internal pseudo random sequence generator applies a pseudo random sequence waveform to the input of the broadband receiver, the pseudo random sequence waveform being process by the digital signal processor to generate equalization filter coefficients for the IF stages.
摘要翻译：宽带接收机振幅/相位归一化的方法使用内部归一化源 - 热补偿噪声源和伪随机序列发生器。经校准的信号被施加到宽带接收机的输入端并被数字信号处理器处理以产生增益对频率表。然后将内部噪声源施加到宽带接收机的输入端并由数字信号处理器进行处理以产生噪声电平对频率表。最后，内部伪随机序列发生器将伪随机序列波形应用于宽带接收机的输入，伪随机序列波形由数字信号处理器处理以产生用于IF级的均衡滤波器系数。

6. 发明授权

US06366766B1 Input protection circuit for a radio frequency 失效
标题翻译：射频保护电路
公开(公告)号：US06366766B1
公开(公告)日：2002-04-02
申请号：US09570469
申请日：2000-05-12
申请人： Donald J. Dalebroux
发明人： Donald J. Dalebroux
IPC分类号： H04B116
CPC分类号： H04B1/18 , H04B1/109
摘要： An input protection circuit for an RF circuit has an input switch that decouples a RF input signal from the circuit path when the power level of the input signal is greater than a preselected threshold. An isolation device receives the input signal from the switch and couples a first portion of the signal to a switch control loop. The switch control loop includes a level detector that generates an output proportional to the average power of the input signal. The output of the detector is coupled to a comparator that also receives a reference signal for comparison with the detector output. The comparator generates an output signal that energizes the switch when the detector output exceeds the reference signal. The switch couples the input signal directly to ground or through a load to ground. A reset command resets the input switch to re-couple the input signal into the RF circuit. A power limiter, coupled to receive a second portion of the RF signal from the isolation device, prevents high power level, sort duration pulses of the input signal from passing further through the circuit. The isolation device prevents reflections from the power limiter from reflecting back into the level detector.
摘要翻译：用于RF电路的输入保护电路具有输入开关，当输入信号的功率电平大于预选阈值时，该输入开关将RF输入信号与电路路径分离。隔离装置从开关接收输入信号，并将信号的第一部分耦合到开关控制回路。开关控制回路包括电平检测器，其产生与输入信号的平均功率成比例的输出。检测器的输出耦合到比较器，该比较器还接收用于与检测器输出进行比较的参考信号。当检测器输出超过参考信号时，比较器产生一个输出信号，使开关通电。开关将输入信号直接耦合到地或通过负载耦合到地。复位命令复位输入开关，将输入信号重新耦合到RF电路中。耦合以从隔离装置接收RF信号的第二部分的功率限制器防止高功率电平，输入信号的分类持续时间脉冲进一步通过电路。隔离装置防止来自功率限制器的反射反射回电平检测器。

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