知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

135 条记录 (耗时 0.016 秒)

    Vertical amplifier system for multitrace oscilloscope and method for calibrating the same
    91.
    发明授权
    Vertical amplifier system for multitrace oscilloscope and method for calibrating the same 失效
    用于多轨示波器的垂直放大器系统及其校准方法

    公开(公告)号：US5272449A

    公开(公告)日：1993-12-21

    申请号：US26081

    申请日：1993-03-04

    申请人： Masao Izawa

    发明人： Masao Izawa

    IPC分类号： G01R13/22 ,  G01R13/28 ,  G01R35/00 ,  H03F1/30 ,  H03G3/20 ,  H03F1/02

    CPC分类号： G01R35/002 ,  G01R13/22 ,  G01R13/28 ,  H03F1/304

    摘要： A vertical amplifier system for a multitrace oscilloscope including a first and a second variable gain amplifiers each connected to each channel of a multitrace oscilloscope. First, a first reference voltage is fed to the two variable gain amplifiers at the same time. The polarity of output of the second variable gain amplifier is inverted, and the inverted output is added to the output of the first variable gain amplifier by an adder. The added result is detected by a resistor. A CPU automatically controls a gain of at least one of the variable gain amplifiers while receiving the added result so that the added result becomes zero. Second, a second reference voltage (a ground level voltage, for example) is applied to both variable gain amplifiers, and an offset of at least one of the variable gain amplifiers is adjusted so that the added result detected by the resistor becomes zero. The input-output characteristics of both variable gain amplifiers are equalized with high accuracy.

    摘要翻译： 一种用于多雷达示波器的垂直放大器系统，包括每个连接到多雷达示波器的每个通道的第一和第二可变增益放大器。 首先，将第一参考电压同时馈送到两个可变增益放大器。 第二可变增益放大器的输出极性反转，反相输出由加法器加到第一可变增益放大器的输出端。 附加结果由电阻检测。 CPU在接收到相加结果时自动控制至少一个可变增益放大器的增益，使得相加结果变为零。 第二，对两个可变增益放大器施加第二参考电压（例如地电平电压），并且调整至少一个可变增益放大器的偏移，使得由电阻器检测的相加结果变为零。 两个可变增益放大器的输入输出特性均具有高精度。

    Apparatus for playing back data read out of data tracks on a recorded medium
    92.
    发明授权
    Apparatus for playing back data read out of data tracks on a recorded medium 失效
    用于回放从记录介质上的数据轨道读出的数据的装置

    公开(公告)号：US5050151A

    公开(公告)日：1991-09-17

    申请号：US250730

    申请日：1988-09-28

    申请人： Arthur Kurz

    发明人： Arthur Kurz

    IPC分类号： G11B7/09 ,  G11B7/095 ,  H03F1/30

    CPC分类号： G11B7/094 ,  G11B7/0909 ,  H03F1/304

    摘要： An arrangement for playing back data read out of data tracks on a recorded medium, in which a tracking circuit positions a beam of light on data tracks of the recorded medium. From a photodetector with a plurality of photodiodes, there are generated a data signal, a focusing-error signal, and a tracking-error signal. These signals result from the beam of light that is reflected by the recorded medium onto the photodetector. An offset-compensation voltage is applied to one input of a tracking control amplifier in the tracking circuit. The tracking error signal is generated from photovoltages of predetermined ones of photodiodes. The offset-compensation voltage is varied until one of the photovoltages is equal to the sum of the offset-compensation voltage and of another one of the photovoltages to maintain the operating point of the tracking circuit at an optimal midpoint.

    摘要翻译： 用于在记录介质上从数据轨道读出数据的装置，其中跟踪电路将光束定位在记录介质的数据轨道上。 从具有多个光电二极管的光电检测器产生数据信号，聚焦误差信号和跟踪误差信号。 这些信号是由被记录介质反射到光电检测器上的光束产生的。 偏移补偿电压被施加到跟踪电路中的跟踪控制放大器的一个输入端。 跟踪误差信号由预定的光电二极管的光电压产生。 偏移补偿电压发生变化，直到其中一个光伏电压等于偏移补偿电压和另一个光伏电压的总和，以将跟踪电路的工作点保持在最佳中点。

    Instantaneous floating point amplifier
    93.
    发明授权
    Instantaneous floating point amplifier 失效
    瞬时浮点放大器

    公开(公告)号：US4704584A

    公开(公告)日：1987-11-03

    申请号：US878188

    申请日：1986-06-25

    申请人： Miles A. Smither

    发明人： Miles A. Smither

    IPC分类号： G01V1/24 ,  H03F1/30 ,  H03G3/20 ,  H03G7/00 ,  H03G3/30

    CPC分类号： H03G3/30 ,  G01V1/245 ,  H03F1/304 ,  H03G7/007

    摘要： An improved instantaneous floating point (IFP) amplifier is provided having a plurality of cascaded amplifier stages, with each stage having a plurality of possible gains. The input sample signal is passed through each stage so that no stage is selectively bypassed.A bipolar, logarithmic amplifier is used for gain control. The gain control bits correspond to the industry standard gain control codes, thereby eliminating the need for bit mapping.The offset voltage control circuit is initialized during power-up by removing the IFP input signal and measuring the input referred offset at each gain setting. The measurements are stored. When a sample signal is received at the IFP amplifier input, the appropriate gain is applied to that signal along with the stored offset value corresponding to that gain.

    摘要翻译： 提供了具有多个级联放大器级的改进的瞬时浮点（IFP）放大器，其中每个级具有多个可能的增益。 输入采样信号通过每个级，以便不选择旁路级。 双极对数放大器用于增益控制。 增益控制位对应于工业标准增益控制代码，从而消除对位映射的需要。 通过去除IFP输入信号并在每个增益设置下测量输入参考偏移量，在上电期间初始化偏移电压控制电路。 存储测量值。 当在IFP放大器输入端接收到采样信号时，适当的增益与对应于该增益的存储偏移值一起施加到该信号。

    Alterable frequency response electrocardiographic amplifier
    94.
    发明授权
    Alterable frequency response electrocardiographic amplifier 失效
    可变频率响应心电图放大器

    公开(公告)号：US4494551A

    公开(公告)日：1985-01-22

    申请号：US441175

    申请日：1982-11-12

    申请人： Charles A. Little, III ,  Raymond B. Patterson, III

    发明人： Charles A. Little, III ,  Raymond B. Patterson, III

    IPC分类号： A61B5/04 ,  H03F1/26 ,  H03F1/30

    CPC分类号： A61B5/04004 ,  H03F1/26 ,  H03F1/304 ,  Y10S128/901 ,  Y10S128/902

    摘要： An electrocardiographic amplifier having an integrator in the feedback loop between the amplifier's input and output whose time constant is varied by the duty cycle of a series switch to vary the low frequency 3 dB roll-off point as a function of the detected low frequency noise in the amplifier output signal. A capacitor is switched in parallel with the inverting feedback resistor to lower the high frequency 3 dB roll-off point in response to detected high frequency noise.

    摘要翻译： 一种心电放大器，其具有在放大器的输入和输出之间的反馈回路中的积分器，其时间常数随着串联开关的占空比而变化，以根据检测到的低频噪声的变化来改变低频3dB滚降点 放大器输出信号。 电容器与反相反馈电阻并联开关，以响应检测到的高频噪声降低高频3 dB滚降点。

    Dynamic zero offset compensating circuit for A/D converter
    95.
    发明授权
    Dynamic zero offset compensating circuit for A/D converter 失效
    用于A / D转换器的动态零点补偿电路

    公开(公告)号：US4251803A

    公开(公告)日：1981-02-17

    申请号：US912123

    申请日：1978-06-02

    申请人： Pierre Debord ,  Jean-Louis Marijon

    发明人： Pierre Debord ,  Jean-Louis Marijon

    IPC分类号： H03M1/10 ,  H03F1/30 ,  H03F3/00 ,  H03F3/38 ,  H03M1/00 ,  H03K13/02

    CPC分类号： H03F1/304 ,  H03M1/1295

    摘要： Disclosed is a dynamic compensation circuit for correcting the residual offset voltage encountered in an analog-to-digital conversion chain. Samples of an analog signal having an average value equal to 0 are provided to a first input of a comparator, the second input of which receives a reference signal generated through a D to A converter under control of a control logic circuit. A sample and hold circuit with the comparator causes a DC offset of the output signal level which is to be dynamically corrected by the compensating circuit of the invention. The DC offset causes the duty cycle to differ from one by an amount .DELTA.DC which will be the error curve signal of the compensation circuit. The compensating circuit reduces the .DELTA.DC to 0 by adding to the signal a DC voltage opposite to and of equal magnitude to the offset voltage level.

    摘要翻译： 公开了用于校正在模数转换链中遇到的残余失调电压的动态补偿电路。 具有等于​​0的平均值的模拟信号的样本被提供给比较器的第一输入，其比较器的第一输入在控制逻辑电路的控制下接收通过D转换器A产生的参考信号。 具有比较器的采样和保持电路引起将由本发明的补偿电路动态校正的输出信号电平的DC偏移。 直流偏移导致占空比不同于一个量程DELTA DC，这将是补偿电路的误差曲线信号。 补偿电路通过向信号增加与偏移电压电平相反且等于幅度的DC电压，将DELTA DC减小到0。

    DC offset compensation
    100.
    发明授权
    DC offset compensation 有权

    公开(公告)号：US09716476B2

    公开(公告)日：2017-07-25

    申请号：US14142276

    申请日：2013-12-27

    申请人： Wolfson Microelectronics plc

    发明人： John Paul Lesso

    IPC分类号： H03F3/181 ,  H03K3/013 ,  H03F3/183 ,  H03F1/30

    CPC分类号： H03F3/181 ,  H03F1/304 ,  H03F3/183 ,  H03F2200/03 ,  H03K3/013

    摘要： An apparatus and method for DC offset compensation. An amplifier receives an input signal (AIN) and provides an amplified output signal (SOUT) and a feedback path provides DC offset compensation. The feedback path comprises at least one voltage controlled oscillator (VCO) and a counter. The VCO provides, over time, a first VCO output signal based on said amplified output signal and a second VCO output signal based on a reference signal (VREF). The counter generates first pulse counts based upon the first VCO output signal and second pulse counts based upon the second VCO output signal and provides a compensation signal based on a comparison of the first and second pulse counts. One voltage controlled oscillator may sequentially receive a signal based on said amplifier output signal and the reference signal from a multiplexer so as to sequentially produce the first and second VCO output signals.