公开(公告)号：US5656929A

公开(公告)日：1997-08-12

申请号：US548067

申请日：1995-10-25

申请人： Melvin D. Humpherys

发明人： Melvin D. Humpherys

IPC分类号： G01R21/00 ,  G01R21/01 ,  H04B17/00 ,  G01R23/06 ,  G01R21/04

CPC分类号： G01R21/01 ,  H04B17/102 ,  H04B17/15 ,  H04B17/16

摘要： An economical, wide range and accurate power measurement technique switches an RF detector between an applied RF IN to be measured and a COMPARISON RF IN, to thus develop a difference signal. The difference signal is filtered, amplified by a logarithmic amplifier, and then converted into a DC error signal by a synchronous detector operating in step with the switching of the RF detector. The DC error signal is applied to an integrator whose output is a loop control signal. Assuming a square law detector, the square of the loop control signal is linearly proportional to the applied RF IN once a servo loop is hulled by making COMPARISON RF IN equal to RF IN. The desired power measurement is performed by digitizing the loop control signal and performing the appropriate arithmetic operations thereon. The loop control signal is also applied to an analog multiplier, where it combines with an internal RF reference signal to produce, at the output of an attenuator following the multiplier, the COMPARISON RF SIGNAL. The entire loop servos to minimize the difference between the applied RF IN and the COMPARISON RF SIGNAL. When RF IN gets small an increase in attenuation allows the multiplier to continue to operate within an optimum dynamic range by reducing the COMPARISON RF SIGNAL to the same general level as RF IN.

摘要翻译： 经济，宽范围和精确的功率测量技术将RF检测器切换到要测量的RF IN和比较RF IN之间，从而产生差分信号。 差分信号被对数放大器滤波，放大，然后通过与RF检测器的切换同步操作的同步检测器转换成DC误差信号。 DC误差信号被施加到其输出是环路控制信号的积分器。 假设一个平方律检测器，一旦通过使比较RF IN等于RF IN，对伺服回路进行了外壳，环路控制信号的平方与所施加的RF IN成线性比例。 通过数字化环路控制信号并在其上执行适当的算术运算来执行所需的功率测量。 环路控制信号也被应用于模拟乘法器，其中它与内部RF参考信号组合，以在乘法器之后的衰减器的输出处产生比较RF信号。 整个环路伺服器可以最小化所应用的RF IN和比较RF信号之间的差异。 当RF IN小时，衰减的增加允许乘法器通过将比较RF信号降低到与RF IN相同的一般级别来继续在最佳动态范围内工作。

公开(公告)号：US5663638A

公开(公告)日：1997-09-02

申请号：US681564

申请日：1996-07-29

申请人： Melvin D. Humpherys

发明人： Melvin D. Humpherys

IPC分类号： G01R21/02 ,  G01R21/08 ,  G01R22/04 ,  G01R19/03

CPC分类号： G01R21/02 ,  G01R22/04

摘要： The effects of differential heating inside the calorimetric bridge are reduced by first heating the bridge externally and controlling the resulting temperature. The bridge is also heated internally by an amount that varies according to the applied power to be measured. This acts to eliminate the principal source of thermal gradients in the first instance. By applying this heat as a common mode input signal to the two terminating loads of the calorimetric bridge the bridge itself does not become unbalanced, and therefore does not attempt to measure that common power. Actual input power to be measured does initially unbalance the bridge, and is still measured as usual. A constant power circuit is response to the indication of measured power and acts to keep the sum of measured power (plus the equal amount of feedback power that balances the bridge) and the common mode power at a constant value corresponding to a full scale measurement. This eliminates internal thermal transients within the bridge that lengthen response time. The feedback signal to balance the calorimetric bridge is produced by an integrator. To allow operation of the integrator output closer to zero for measurement of small applied signals, the applied input to be measured is periodically removed and a suitable slight offset from the true balance condition is introduced into the servo loop. The bridge is then exactly balanced with a separate sample and hold control loop. "Periodically" can mean once a second, ten times a second, or as is preferred, at the start of each measurement.

摘要翻译： 首先通过外部对桥进行加热并控制所产生的温度来降低量热桥内差示加热的影响。 该桥还在内部加热一定量，根据所测量的施加功率而变化。 这样做首先消除了主要的热梯度来源。 通过将该热量作为共模输入信号施加到量热桥的两个端接负载，桥本身不会变得不平衡，因此不试图测量该共同功率。 要测量的实际输入功率最初不平衡桥，并且仍照常测量。 恒定功率电路响应于测量功率的指示，并且用于将测量功率的总和（加上平衡桥的反馈功率的相等量）和共模功率保持在对应于满量程测量的恒定值。 这消除了桥梁内的内部热瞬变，延长了响应时间。 用于平衡量热桥的反馈信号由积分器产生。 为了允许积分器输出的操作更接近于零，用于测量小的施加信号，所施加的待测量输入被周期性地去除，并且与真实平衡条件的适当的微小偏移被引入到伺服环路中。 然后，桥接器与单独的采样和保持控制回路完全平衡。 在每次测量开始时，“周期性”可以意味着每秒一次，十次或一次优选。

公开(公告)号：US06587671B1

公开(公告)日：2003-07-01

申请号：US09322505

申请日：1999-05-28

申请人： Kerwin D. Kanago ,  David L. Platt ,  James B. Summers ,  Melvin D. Humpherys ,  Richard P. Ryan ,  Matthew Johnson

发明人： Kerwin D. Kanago ,  David L. Platt ,  James B. Summers ,  Melvin D. Humpherys ,  Richard P. Ryan ,  Matthew Johnson

IPC分类号： H04Q734

CPC分类号： H04W24/00

摘要： An RF test set having a concurrent measurement architecture is provided. The RF test set is adapted for testing an RF communications device such as a cellular phone according to a set of RF tests. An RF source and an RF receiver are used to communicate with the cellular phone in order to perform the call processing operations to control the cellular phone while performing parametric measurements according to the RF tests. Concurrent measurements allow operation of concurrent measurement processes and call processing operations to take place in the RF test set in order to decrease the time required for each RF test and to increase measurement throughput of the RF test set.

摘要翻译： 提供了具有并发测量架构的RF测试组。 RF测试组适用于根据一组RF测试来测试诸如蜂窝电话的RF通信设备。 使用RF源和RF接收机与蜂窝电话进行通信，以便根据RF测试执行参数测量时执行呼叫处理操作以控制蜂窝电话。 并发测量允许在RF测试集中进行并发测量过程和呼叫处理操作，以减少每次RF测试所需的时间并增加RF测试集的测量吞吐量。

公开(公告)号：US5668510A

公开(公告)日：1997-09-16

申请号：US688978

申请日：1996-07-31

申请人： Melvin D. Humpherys

发明人： Melvin D. Humpherys

IPC分类号： H01P5/12 ,  H03H7/48

CPC分类号： H03H7/48 ,  H01P5/12

摘要： A wide band (20 MHz to 2 GHz) four way RF power splitter/combiner is fabricated from four lengths of hard line mounted on a printed circuit board. Slots in the board allow for ferrite sleeves, and allow the hard line to be mounted right next to the surface(s) of the board. The pieces of hard line do not cross each other, and do not pass from one side of the board to the other. Two of the pieces are on one side of the board, while the other two are on the other. Within one pair the two pieces of hard line lie essentially along a straight line. Within the other pair the two pieces are offset, parallel and overlap slightly. All four pieces are parallel. Of the four pieces, one pair may be preformed to be two identical parts; the other pair may be also, although one pair may have a longer portion of center conductor extending beyond a 90.degree. bend. All four pieces of hard line are straight (i.e., their outer shields are straight, and are not bent).

摘要翻译： 宽带（20 MHz至2 GHz）四路RF功率分配器/组合器由安装在印刷电路板上的四根硬线制成。 板上的插槽允许使用铁氧体套筒，并允许将硬线安装在电路板表面的正下方。 硬线不要彼此交叉，不要从板的一侧传递到另一侧。 其中两块在板的一侧，另外两块在另一面。 在一对中，两条硬线基本上沿着一条直线。 在另一对中，两个部分偏移，平行并稍微重叠。 所有四件都是平行的。 在四个部件中，一对可以预成形为两个相同的部件; 另一对也可以，尽管一对可能具有延伸超过90度弯曲的中心导体的较长部分。 所有四条硬线都是直的（即它们的外护罩是直的，不弯曲的）。