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51.发明授权Pipelined analog-to-digital converter (ADC) systems, methods, and computer program products 失效流水线模数转换器（ADC）系统，方法和计算机程序产品公开(公告)号：US06169502A
公开(公告)日：2001-01-02
申请号：US09075506
申请日：1998-05-08
IPC分类号： H03M110
CPC分类号： H03M1/1057 , H03M1/442
摘要： A pipelined analog-to-digital converter (ADC) is calibrated to enable production of an n-bit digital output representing an n-2 bit binary word, where “n” is a selected large positive integer, for example without limitation on the order of ten (10). In an analog-to-digital converter (ADC) having a plurality stages, each stage includes a stage input connection, a stage output connection, and a capacitor circuit including first and second predetermined capacitors (C1 and C2) and a variable capacitance calibration capacitor (Ccal). The first and second capacitors and the variable capacitance calibration capacitor are connected to each other at a capacitor common node. An amplifier input connection is connected to a capacitor common node. A comparator input connection (CIC) is connected to a stage input connection. A track and hold circuit (THC) is coupled to an amplifier output connection, and a source follower circuit (SF) is connected to a stage output connection.
摘要翻译： 对流水线模数转换器（ADC）进行校准，以产生表示n-2位二进制字的n位数字输出，其中“n”是选定的大正整数，例如不限于订单 十（10）。 在具有多级的模/数转换器（ADC）中，每级包括级输入连接，级输出连接和包括第一和第二预定电容器（C1和C2）和可变电容校准电容器 （Ccal）。 第一和第二电容器和可变电容校准电容器在电容器公共节点处彼此连接。 放大器输入连接连接到电容公共节点。 比较器输入连接（CIC）连接到级输入连接。 轨道和保持电路（THC）耦合到放大器输出连接，源极跟随器电路（SF）连接到级输出连接。
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公开(公告)号：US6150891A
公开(公告)日：2000-11-21
申请号：US87488
申请日：1998-05-29
申请人： David R. Welland , Caiyi Wang
发明人： David R. Welland , Caiyi Wang
IPC分类号： H03D7/16 , H03L7/087 , H03L7/099 , H03L7/187 , H03L7/199 , H03L7/23 , H04B1/26 , H04B1/30 , H03B5/08 , H03L7/06 , H03L7/091 , H03L7/16
CPC分类号： H03L7/099 , H03D7/163 , H03L7/087 , H03L7/187 , H03L7/199 , H03L7/23 , H04B1/26 , H03J2200/10 , H04B1/30
摘要： The synthesis of high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) that has a discretely variable capacitance in conjunction with a continuously variable capacitance. The discretely variable capacitance may provide coarse tuning adjustment of the variable capacitance to compensate for capacitor and inductor tolerances and to adjust the output frequency to be near the desired frequency output. The continuously variable capacitance may provide a fine tuning adjustment of the variable capacitance to focus the output frequency to match precisely the desired frequency output. During fine tuning adjustment, the PLL may be controlled by a plurality of analog control signals. The analog control signals may be derived by first generating a plurality of phase shifted signals from a divided version of the VCO output clock by using a shift register. The shift register may be clocked by another clock signal at a higher frequency than the divided version of the VCO output clock. The phase differences between the plurality of phase shifted signals and a divided version of a reference clock may then be detected and converted to the analog control signals.
摘要翻译： 诸如无线通信信号的高频信号的合成包括具有可变电容压控振荡器（VCO）的锁相环（PLL）频率合成器，该可变电容压控振荡器（VCO）具有连续可变电容的离散可变电容。 离散可变电容可以提供可变电容的粗调谐调整，以补偿电容器和电感器公差，并将输出频率调整为接近期望的频率输出。 连续可变电容可以提供可变电容的微调调整，以将输出频率聚焦以精确地匹配期望的频率输出。 在微调调整期间，PLL可以由多个模拟控制信号控制。 可以通过使用移位寄存器首先从VCO输出时钟的分割版本生成多个相移信号来导出模拟控制信号。 移位寄存器可以以比VCO输出时钟的分频版本更高的频率由另一个时钟信号来计时。 然后可以检测多个相移信号和参考时钟的分割版本之间的相位差并转换成模拟控制信号。
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公开(公告)号：US6104794A
公开(公告)日：2000-08-15
申请号：US34460
申请日：1998-03-04
IPC分类号： H03M1/42 , H04L7/033 , H04L25/02 , H04L25/06 , H04M1/57 , H04M11/06 , H04M19/00 , H04M19/02 , H04M1/00 , H04M1/56 , H04M9/00 , H04M9/08 , H04M15/06
CPC分类号： H04L25/06 , H04L25/0266 , H04M1/573 , H04M11/06 , H04M19/001 , H04M19/02 , H04L7/033
摘要： A communication system is provided which draws virtually no loop current during a ringing burst and only draws on-hook loop current during the caller ID field. More particularly, ringer burst circuitry may be powered from the user powered circuitry by the transmission of power across the isolation barrier rather than being powered from the phone line. Thus, loop current need not be drawn from the TIP/RING lines during ringer bursts. The isolation barrier may be a capacitive isolation barrier which allows bidirectional communication and extraction of power from signals transmitted across the barrier.
摘要翻译： 提供一种通信系统，其在振铃突发期间几乎不消除环路电流，并且仅在呼叫者ID字段期间吸引挂机环路电流。 更具体地，振铃突发电路可以由用户供电的电路通过跨隔离屏障的功率传输而不是从电话线供电。 因此，在振铃器脉冲串期间，不需要从TIP / RING线路中抽出回路电流。 隔离屏障可以是电容隔离屏障，其允许通过屏障传输的信号的双向通信和功率提取。
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54.发明授权Transconductance amplifiers and exponential variable gain amplifiers using the same 失效跨导放大器和使用其的指数可变增益放大器
公开(公告)号：US5451901A
公开(公告)日：1995-09-19
申请号：US270126
申请日：1994-07-01
申请人： David R. Welland
发明人： David R. Welland
CPC分类号： H03F3/45179 , H03F3/45197 , H03G1/0029 , H03F2203/45072 , H03F2203/45082 , H03F2203/45112 , H03F2203/45188 , H03F2203/45401 , H03F2203/45466 , H03F2203/45471
摘要： Transconductance amplifiers having high speed, a wide output voltage swing, good linearity and expandability are disclosed. All active devices are n-channel MOSFET devices with the output current of the amplifiers being provided by devices with their sources tied to ground. Connection of one of the MOSFET transconductance amplifiers to a MOSFET load device and appropriate control of the MOSFET resistance devices in the transconductance amplifier and the load circuit provides a variable gain amplifier having a good estimation of an exponential response to the gain control signal, thus being suitable for use in closed loop automatic gain control circuits.
摘要翻译： 公开了具有高速度，宽输出电压摆幅，良好线性度和可扩展性的跨导放大器。 所有有源器件都是n沟道MOSFET器件，放大器的输出电流由其源极接地的器件提供。 将MOSFET跨导放大器之一连接到MOSFET负载器件，并对跨导放大器和负载电路中的MOSFET电阻器件进行适当的控制，提供可变增益放大器，其具有对增益控制信号的指数响应的良好估计，因此 适用于闭环自动增益控制电路。
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公开(公告)号：US5159341A
公开(公告)日：1992-10-27
申请号：US667818
申请日：1991-03-12
申请人： Damien McCartney , David R. Welland
发明人： Damien McCartney , David R. Welland
IPC分类号： H03M3/02
摘要： A delta sigma modulator provides dual phase sampling of analog input and/or a reference voltage. This dual phase sampling may be realized using a switched capacitor circuit having dual legs with a capacitor on each such leg. The dual phase sampling of the reference voltage poses a complication that mandates the necessity of providing a compensation signal. The delta sigma modulator is provided with appropriate circuitry to provide a compensation signal that compensates for the reduced signal level due to the dual sampling. In particular, the delta sigma modulator compensates for the reduced level of the output from an integrating amplifier circuit due to the timing necessary to implement the dual sampling approach.
摘要翻译： ΔΣ调制器提供模拟输入和/或参考电压的双相采样。 这种双相采样可以使用具有在每个这样的支路上具有电容器的双支路的开关电容器电路来实现。 参考电压的双相采样构成了需要提供补偿信号的复杂性。 ΔΣ调制器设置有适当的电路，以提供补偿信号，该补偿信号补偿由于双重采样引起的降低的信号电平。 特别地，由于执行双重采样方法所需的定时，ΔΣ调制器补偿了积分放大器电路的输出电平的降低。
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公开(公告)号：US4473793A
公开(公告)日：1984-09-25
申请号：US247648
申请日：1981-03-26
CPC分类号： H03F1/307 , Y10S323/907
摘要： An improved bias generator provides a bias voltage output which is a function of an input current Iprog and provides a bias current to a preselected load which tracks the input signal independently of temperature. The amount the bias voltage output changes with temperature is determined by (1) V(T, Iprog), a voltage-current temperature dependent function of the base-emitter voltage drop of at least one transistor and (2) X, a scalar which is easily provided by setting the ratio of two resistors. The generator can therefore be easily constructed for particular circuit loads which include at least one semiconductive junction such that the biasing current through the load will be substantially independent of temperature.
摘要翻译： 改进的偏置发生器提供偏置电压输出，其是输入电流Iprog的函数，并且将偏置电流提供给独立于温度跟踪输入信号的预选负载。 偏置电压输出随温度变化的量由（1）V（T，Iprog）确定，V（T，Iprog）是至少一个晶体管的基极 - 发射极电压降的电压 - 电流温度依赖函数，（2）X，标量 通过设置两个电阻的比例容易提供。 因此，发电机可以容易地构建用于特定电路负载，其包括至少一个半导体结，使得通过负载的偏置电流将基本上与温度无关。
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公开(公告)号：US4409500A
公开(公告)日：1983-10-11
申请号：US247811
申请日：1981-03-26
申请人： David R. Welland
发明人： David R. Welland
CPC分类号： H03D1/18
摘要： An improved current mode operational rectifier having loop transmissions through both feedback paths of an operational amplifier stage which limit at unity gain. An improved bias generator which can be used to bias the operational rectifier is also disclosed.
摘要翻译： 改进的电流模式操作整流器具有通过运算放大器级的两个反馈路径的环路传输，其限制了单位增益。 还公开了可用于偏置可操作整流器的改进的偏置发生器。
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公开(公告)号：US4329598A
公开(公告)日：1982-05-11
申请号：US137427
申请日：1980-04-04
申请人： David R. Welland
发明人： David R. Welland
摘要： An improved bias generator provides a bias voltage output which varies with temperature in accordance with a predetermined voltage-temperature function.
摘要翻译： 改进的偏置发生器提供根据预定电压 - 温度函数随温度变化的偏置电压输出。
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公开(公告)号：US09870103B2
公开(公告)日：2018-01-16
申请号：US13342658
申请日：2012-01-03
CPC分类号： G06F3/044 , G06F3/0416
摘要： A controller for a capacitive touch screen or the like includes a touch resolve subsystem and a processor. The touch resolve subsystem, when activated, measures a plurality of capacitance values using a plurality of input pins. The processor uses the plurality of capacitance values at each of a plurality of values of a parameter to create an interference map.
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60.发明申请公开(公告)号：US20130169584A1
公开(公告)日：2013-07-04
申请号：US13342673
申请日：2012-01-03
IPC分类号： G06F3/045
CPC分类号： G06F3/0416 , G06F3/044
摘要： A controller for a capacitive touch screen includes a touch resolve subsystem and a processor. The touch resolve subsystem, in response to a trigger input, measures a plurality of capacitance values using a plurality of input pins. The processor controls the touch resolve subsystem to acquire a baseline capacitance in a calibration mode, to acquire a frame comprising the plurality of capacitance values in a normal operation mode, and to update the baseline capacitance to a new baseline capacitance in the normal operation mode in response to the frame without entering the calibration mode.
摘要翻译： 用于电容式触摸屏的控制器包括触摸解析子系统和处理器。 触摸解析子系统响应于触发输入，使用多个输入引脚测量多个电容值。 处理器控制触摸解析子系统以在校准模式中获取基线电容，以在正常操作模式中获取包含多个电容值的帧，并且在正常操作模式中将基线电容更新为新的基线电容 响应帧而不进入校准模式。
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