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1. 发明授权

US07068087B2 Method and apparatus for an improved timer circuit and pulse width detection 失效
标题翻译：用于改进定时器电路和脉冲宽度检测的方法和装置
公开(公告)号：US07068087B2
公开(公告)日：2006-06-27
申请号：US10786514
申请日：2004-02-24
申请人： John F. Stoops , Steven K. Sullivan
发明人： John F. Stoops , Steven K. Sullivan
IPC分类号： H03K3/017
CPC分类号： G01R13/0254 , H03K5/04 , H03K5/05 , H03K5/1252 , H03K2005/00247
摘要： A method and apparatus for an improved timer circuit and improved pulse width detection includes initiating a ramp timer and setting a timer latch output level substantially simultaneously in response to the occurrence of an input signal. The occurrence of the input signal also causes a counter to be enabled to count clock cycles. The ramp timer signal of the ramp timer is frozen (i.e., paused) by a timer control circuit, upon the occurrence of a first clock cycle following the enabling of the counter. The counter then counts a predetermined number of clock cycles after the ramp timer signal is frozen and, upon the occurrence of a last one of a predetermined number of clock cycles, generates a terminal count signal. Upon receiving the terminal count signal, the timer control circuit unfreezes ramp timer signal. The ramp timer runs until completion at which time the ramp timer generates an end of ramp control signal. The control signal is communicated to timer latch to reset timer latch output level.
摘要翻译：用于改进的定时器电路和改进的脉冲宽度检测的方法和装置包括响应于输入信号的发生而启动斜坡定时器并且基本上同时设置定时器锁存器输出电平。输入信号的出现也使计数器能够对时钟周期进行计数。斜坡定时器的斜坡定时器信号在定时器控制电路被冻结（即暂停）之后，在计数器使能之后出现第一个时钟周期。然后，在斜坡定时器信号被冻结之后，计数器计数预定数量的时钟周期，并且在预定数量的时钟周期中的最后一个发生时，产生终端计数信号。在接收到终端计数信号时，定时器控制电路解冻斜坡定时器信号。斜坡定时器运行直到完成，此时斜坡计时器产生斜坡控制信号的结束。控制信号被传送到定时器锁存器以复位定时器锁存器输出电平。

2. 发明授权

US08531209B2 Multifunction word recognizer element 失效
公开(公告)号：US08531209B2
公开(公告)日：2013-09-10
申请号：US12355038
申请日：2009-01-16
申请人： John F. Stoops , Daniel G. Knierim
发明人： John F. Stoops , Daniel G. Knierim
IPC分类号： H03K5/22
CPC分类号： H03K5/2481 , G01R13/0254 , G01R31/3177
摘要： A circuit includes a load; a first differential pair coupled to the load and responsive to input data; a second differential pair coupled to the load and responsive to the input data; a third differential pair coupled to the first differential pair and the second differential pair and responsive to a first control signal and a second control signal; a bias circuit configured to pull a node coupled to both the first differential pair and the second differential pair to a predetermined state; and a current source coupled to the third differential pair and the bias circuit.

3. 发明授权

US06720828B2 Apparatus and method for compensating a high impedance attenuator 有权
标题翻译：用于补偿高阻抗衰减器的装置和方法
公开(公告)号：US06720828B2
公开(公告)日：2004-04-13
申请号：US09992058
申请日：2001-11-21
申请人： Theodore G. Nelson , Michael P. Khaw , Daniel G. Knierim , John F. Stoops
发明人： Theodore G. Nelson , Michael P. Khaw , Daniel G. Knierim , John F. Stoops
IPC分类号： H03G320
CPC分类号： H03H11/24
摘要： A high impedance attenuator for use in a test and measurement instrument employs compensation to adjust the low frequency attenuation to match the high frequency attenuation exhibited by the attenuator, rather than attempting to adjust the high frequency attenuation exhibited by the attenuator. In an alternate embodiment of the invention, compensation to adjust low frequency attenuation is employed in a feedback loop and an opposite compensation is applied in a parallel attenuation stage to stabilize the input resistance. In yet another embodiment of the invention, compensation to adjust low frequency attenuation is employed by means of an R-C time constant of an additional R-C circuit in a feed forward loop. This additional time constant is matched to the R-C time constant of the input R-C network. The input resistance of the attenuator is not changed.
摘要翻译：用于测试和测量仪器的高阻抗衰减器采用补偿来调节低频衰减，使其与衰减器所显示的高频衰减相匹配，而不是试图调整衰减器所表现的高频衰减。在本发明的替代实施例中，在反馈环路中采用用于调节低频衰减的补偿，并且在并联衰减级中施加相反的补偿以稳定输入电阻。在本发明的另一个实施例中，通过前馈环路中附加的R-C电路的R-C时间常数来采用用于调整低频衰减的补偿。这个额外的时间常数与输入R-C网络的R-C时间常数相匹配。衰减器的输入电阻不变。

4. 发明授权

US06614221B2 Deskew fixture 有权
标题翻译：跷跷板
公开(公告)号：US06614221B2
公开(公告)日：2003-09-02
申请号：US10150397
申请日：2002-05-17
申请人： Kelly F. Cushing , Mark W. Nightingale , John F. Stoops , John C. Calvin , Marc A. Gessford , Marie Ottum
发明人： Kelly F. Cushing , Mark W. Nightingale , John F. Stoops , John C. Calvin , Marc A. Gessford , Marie Ottum
IPC分类号： G01R3102
CPC分类号： G01R31/31922 , G01R1/0408 , G01R1/06772
摘要： A deskew fixture has a multilayer circuit board from which pairs of mirrored signal launch contact extend from both sides of the circuit board. One pair of contacts is coupled to electrical ground and the other pair is connected via equal length, electromagnetically coupled strip lines to a signal source. Probe holders are mounted on the circuit boards to support measurement probes with the probing contacts of the measurement probes coupled to the signal launch contacts. Additional pairs of signal launch contacts may be provided with one pair receiving a positive signal from the signal source and another pair receiving a negative signal via equal length, electromagnetically coupled strip lines from the signal source for deskewing differential measurement probes.
摘要翻译：一种偏移固定装置具有多层电路板，成对的镜像信号发射接触件从电路板的两侧延伸出来。一对触点耦合到电接地，另一对触点通过等长的电磁耦合带状线连接到信号源。探头支架安装在电路板上，以支持测量探头，测量探头的探头触点连接到信号发射触点。可以提供附加的信号发射接点对，其中一对从信号源接收正信号，另一对通过相等长度接收负信号，从信号源的电磁耦合带状线用于偏移校正差分测量探针。

5. 发明授权

US4808858A Dual limit programmable linear signal limiter 失效
标题翻译：双限位可编程线性信号限幅器
公开(公告)号：US4808858A
公开(公告)日：1989-02-28
申请号：US148253
申请日：1988-01-25
申请人： John F. Stoops
发明人： John F. Stoops
IPC分类号： H03K5/08
CPC分类号： H03K5/08
摘要： A current signal limiter provides precise minimum and maximum current limiting. Both maximum and minimum current limits are easily programmable. The signal limiter operates at maximum frequency response without inversion of the input signal. Current signal limiting is achieved by an NPN transistor biased in a common base configuration with the base coupled to a reference voltage source and the collector providing the output current, a series diode coupled to the emitter of the transistor for receiving a trickle current which prevents the transistor from turning off as well as setting a minimum current limit, and a diode matrix for receiving two reference currents and an input current. The diode matrix steers the input and reference currents to the transistor or to the reference voltage source, depending on the magnitude of the input and reference currents. The minimum and maximum current limits are programmable by adjusting the values of the reference currents and the trickle current.
摘要翻译：电流信号限幅器提供精确的最小和最大电流限制。最大和最小电流限制都易于编程。信号限幅器在最大频率响应下工作，而不会反转输入信号。电流信号限制由偏置在公共基极配置中的NPN晶体管实现，其中基极耦合到参考电压源，并且集电极提供输出电流，串联二极管耦合到晶体管的发射极，用于接收涓流以防止晶体管关闭以及设置最小电流限制，以及用于接收两个参考电流和输入电流的二极管矩阵。二极管矩阵根据输入和参考电流的大小，将输入和参考电流转向晶体管或参考电压源。通过调整参考电流和涓流电流的值可以对最小和最大电流限制进行编程。

6. 发明授权

US5841286A Oscilloscope with detection of anomalous events during blind intervals 失效
标题翻译：示波器在盲间隔期间检测到异常事件
公开(公告)号：US5841286A
公开(公告)日：1998-11-24
申请号：US390907
申请日：1995-02-17
申请人： John F. Stoops
发明人： John F. Stoops
IPC分类号： G01R13/20 , G01R13/32 , G01R13/34 , G01R19/17 , G01R31/28
CPC分类号： G01R13/345 , G01R13/32 , G01R19/17
摘要： An oscilloscope comprises a trigger circuit for initiating display of the waveform of an input signal in response to a trigger event, at least one detection circuit responsive to the input signal for detecting occurrence of an anomalous event therein, and a counter for reporting the number of occurrences of the anomalous event that have been detected.
摘要翻译：示波器包括触发电路，用于响应于触发事件开始显示输入信号的波形，响应于输入信号的至少一个检测电路，用于检测其中的异常事件的发生;以及用于报告数量的计数器发生了异常事件的发生。

7. 发明授权

US4873646A Digital Correction of linear system distortion 失效
标题翻译：数字校正线性系统失真
公开(公告)号：US4873646A
公开(公告)日：1989-10-10
申请号：US140703
申请日：1988-01-04
申请人： John F. Stoops
发明人： John F. Stoops
IPC分类号： G01R13/34
CPC分类号： G01R13/345
摘要： An M-element waveform data sequence representative of an analog input signal during a period of interest is produced by first amplifying the input signal with a linear amplifier and periodically digitizing the amplifier output signal to produce a first data sequence having M+N-1 elements. The first N-1 elements of the first data sequence represent magnitudes of the amplifier output signal preceding the period of interest, and the remaining M elements of the first data sequence represent magnitudes of the amplifier output signal during the period of interest. The first data sequence is applied as input to a digital filter which produces an output second data sequence wherein each element of the second data sequence corresponds to an element of the first data sequence and is a linear combination of its corresponding first data sequence element and N-1 data preceding data elements of the first data sequence. The impulse response of the filter is adjusted to compensate for signal distortion caused by the amplifier. The desired M-element waveform data sequence is then obtained as the last M elements of the second data sequence.
摘要翻译：通过首先用线性放大器放大输入信号并周期性地对放大器输出信号进行数字化，产生代表感兴趣期间的模拟输入信号的M元件波形数据序列，以产生具有M + N-1个元件的第一数据序列。第一数据序列的第一N-1个元素表示在感兴趣期间之前的放大器输出信号的幅度，并且第一数据序列的剩余M个元素表示在感兴趣的时段期间的放大器输出信号的幅度。将第一数据序列作为输入应用于产生输出第二数据序列的数字滤波器，其中第二数据序列的每个元素对应于第一数据序列的元素，并且是其对应的第一数据序列元素和N -1数据在第一数据序列的数据元素之前。滤波器的脉冲响应被调整以补偿由放大器引起的信号失真。然后获得期望的M元素波形数据序列作为第二数据序列的最后M个元素。

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