公开(公告)号：US5408235A

公开(公告)日：1995-04-18

申请号：US207040

申请日：1994-03-07

申请人： James T. Doyle ,  Tim Beatty ,  Carl F. Liepold

发明人： James T. Doyle ,  Tim Beatty ,  Carl F. Liepold

IPC分类号： H03H17/02 ,  H03M3/02 ,  H03M1/10

CPC分类号： H03H17/0251 ,  H03M3/462 ,  H03M3/43 ,  H03M3/454

摘要： A "true" 16-bit second order Sigma-Delta based converter that has superior analog components and has a programmable comb filter which is coupled to the digital signal processor. This converter comprises a second order Sigma-Delta modulator and a programmable comb filter. The second order Sigma-Delta modulator dramatically attenuates the baseband quantization noise energy (which in turn increases the resolution of the converter), since its superior amplifiers and comparators enable it to oversample and coarsely quantize the analog input signal at a very high sampling frequency of 12 MHz. The amplifiers are class AB OTAs, which have cross coupled NMOS driven input stages, and cascoded output stages. Also, the common mode voltages are the optimal biasing points, and these voltages are kept constant by a differential input stage, by a PV independent temperature dependent current generator, by optimal device size, and by a common mode feedback circuitry. The programmable comb filter receives the coarsely digitized 1-bit output of the modulator at oversampling frequency F.sub.S, and provides a more accurate representation of the input signal to the DSP at slower sampling rate of F.sub.S /N. In addition, the comb filter uses a 20-bit data path, in order to enable the decimator (which is formed by the comb filter and by the FIR filter) to provide 16 bits of resolution to the DSP. The output of the programmable comb filter is then supplied to an FIR filter which is realized in the DSP, and this filter removes the remaining out-of-baseband noise.

摘要翻译： 一个“真正的”16位二阶Σ-Delta转换器，具有卓越的模拟分量，并具有耦合到数字信号处理器的可编程梳状滤波器。 该转换器包括二阶Σ-Δ调制器和可编程梳状滤波器。 第二级Σ-Δ调制器极大地衰减了基带量化噪声能量（这反过来又增加了转换器的分辨率），因为其优越的放大器和比较器能够以非常高的采样频率对模拟输入信号进行过采样和粗量化 12 MHz。 放大器是AB类ABA，它们具有交叉耦合的NMOS驱动输入级和级联输出级。 此外，共模电压是最佳偏置点，这些电压通过差分输入级，PV独立温度相关电流发生器，最佳器件尺寸以及共模反馈电路保持恒定。 可编程梳状滤波器以过采样频率FS接收调制器的粗略数字化1位输出，并以较慢的FS / N采样速率向DSP提供更精确的输入信号表示。 此外，梳状滤波器使用20位数据路径，以便使能由梳状滤波器和FIR滤波器形成的抽取器能够向DSP提供16位分辨率。 然后将可编程梳状滤波器的输出提供给在DSP中实现的FIR滤波器，该滤波器去除剩余的基带外噪声。

公开(公告)号：US6081139A

公开(公告)日：2000-06-27

申请号：US937907

申请日：1997-09-25

申请人： Carl F. Liepold ,  James T. Doyle

发明人： Carl F. Liepold ,  James T. Doyle

IPC分类号： H01L27/07 ,  H03F3/45 ,  H03K5/24 ,  H03K5/22 ,  H03K17/60

CPC分类号： H03F3/45076 ,  H01L27/0722 ,  H03K5/2481

摘要： The present invention provides a differential amplifier. The differential amplifier includes first and second inputs and an output. The differential amplifier further includes a lateral bipolar transistor. The lateral bipolar transistor includes a well region that has a base region, an emitter region and first and second collector regions. The first and second collector regions are spaced apart from the emitter. The lateral bipolar transistor also includes a first gate, coupled to the first input, to overlay a space between the emitter region and the first collector region. Furthermore, the lateral bipolar transistor includes a second gate, coupled to the second input, to overlay a space between the emitter region and the second collector region. The differential amplifier further includes first and second load devices coupled to the first and second collector regions.

摘要翻译： 本发明提供了一种差分放大器。 差分放大器包括第一和第二输入和输出。 差分放大器还包括横向双极晶体管。 横向双极晶体管包括具有基极区域，发射极区域以及第一和第二集电极区域的阱区域。 第一和第二集电极区域与发射极间隔开。 横向双极晶体管还包括耦合到第一输入的第一栅极，以覆盖发射极区域和第一集电极区域之间的空间。 此外，横向双极晶体管包括耦合到第二输入的第二栅极，以覆盖发射极区域和第二集电极区域之间的空间。 差分放大器还包括耦合到第一和第二集电极区域的第一和第二负载装置。

公开(公告)号：US06198421B1

公开(公告)日：2001-03-06

申请号：US09259650

申请日：1999-02-26

申请人： James T. Doyle ,  Carl F. Liepold

发明人： James T. Doyle ,  Carl F. Liepold

IPC分类号： H03M136

CPC分类号： H03M1/36

摘要： One embodiment of the present invention provides a flash analog-to-digital converter (ADC) based on a feedforward perceptron. The ADC includes a plurality of N stages to provide N digital signals. The plurality of N stages includes a first stage to provide a sum of an input current, related to a voltage to be converted, and of a reference current. The first stage provides a first digital signal in one of first and second states if the sum has one of first and second signs, respectively. The plurality of N stages further includes i stages, with i=2 . . . N. Each stage i includes an output circuit and 2(i−2) sub-stages coupled to the output circuit. Each sub-stage includes an input and a hidden circuit coupled therebetween. The input circuit is configured to provide a first sum of the input current and of a first reference current. Each hidden circuit provides to the output circuit a second reference current when the first sum has a first sign. The output circuit generates an ith digital signal in one of a first and second states when a second sum of the input current and of the second reference current has one of first and second signs respectively.

摘要翻译： 本发明的一个实施例提供一种基于前馈感知器的闪存模数转换器（ADC）。 ADC包括多个N级以提供N个数字信号。 多个N级包括提供与要转换的电压相关的输入电流和参考电流的和的第一级。 如果总和分别具有第一和第二符号之一，则第一级提供第一和第二状态之一的第一数字信号。 多个N级还包括i级，i = 2。 。 。 N.每级i包括一个输出电路和耦合到输出电路的2（i-2）个子级。 每个子级包括耦合在其间的输入和隐藏电路。 输入电路被配置为提供输入电流和第一参考电流的第一和。 当第一和具有第一符号时，每个隐藏电路向输出电路提供第二参考电流。 当输入电流和第二参考电流的第二和分别具有第一和第二符号之一时，输出电路产生第一和第二状态之一的第i个数字信号。

公开(公告)号：US5841821A

公开(公告)日：1998-11-24

申请号：US764513

申请日：1996-12-12

申请人： James T. Doyle ,  Carl F. Liepold

发明人： James T. Doyle ,  Carl F. Liepold

IPC分类号： H03F3/45 ,  H03H7/01 ,  H03H11/04 ,  H04L5/16 ,  H04L25/03 ,  H04B1/10

CPC分类号： H03H7/1766 ,  H03F3/45085 ,  H03H11/045 ,  H03H7/0115 ,  H04L25/03343 ,  H04L5/16 ,  H03F2203/45371 ,  H03F2203/45574 ,  H03F2203/45612

摘要： The present invention provides a bi-directional low pass filtering method and apparatus for attenuating out-of-baseband components of data transmitted from an encoder to a decoder over a transmission medium. In one embodiment of the present invention, the bi-directional low pass filtering apparatus includes a Chebyshev filter that has a first phase response. This Chebyshev filter is coupled to a phase correction circuit, which has a second phase response. This second phase response of the phase correction circuit is designed to oppose the first phase response in order to offset variations in group delay in the data due to the Chebyshev filter.

摘要翻译： 本发明提供一种双向低通滤波方法和装置，用于通过传输介质衰减从编码器发送到解码器的数据的基带外分量。 在本发明的一个实施例中，双向低通滤波装置包括具有第一相位响应的切比雪夫滤波器。 该切比雪夫滤波器耦合到具有第二相位响应的相位校正电路。 相位校正电路的第二相位响应被设计为与第一相位响应相反，以便抵消由切比雪夫滤波器引起的数据中组延迟的变化。

公开(公告)号：US5694439A

公开(公告)日：1997-12-02

申请号：US408270

申请日：1995-03-21

申请人： James T. Doyle ,  Carl F. Liepold

发明人： James T. Doyle ,  Carl F. Liepold

IPC分类号： H03F3/45 ,  H03H7/01 ,  H03H11/04 ,  H04L5/16 ,  H04L25/03 ,  H04B1/10

CPC分类号： H03H7/1766 ,  H03F3/45085 ,  H03H11/045 ,  H03H7/0115 ,  H04L25/03343 ,  H04L5/16 ,  H03F2203/45371 ,  H03F2203/45574 ,  H03F2203/45612

摘要： The present invention provides a bi-directional low pass filtering method and apparatus for attenuating out-of-baseband components of data transmitted from an encoder to a decoder over a transmission medium. In one embodiment of the present invention, the bi-directional low pass filtering apparatus includes a Chebyshev filter that has a first phase response. This Chebyshev filter is coupled to a phase correction circuit, which has a second phase response. This second phase response of the phase correction circuit is designed to oppose the first phase response in order to offset variations in group delay in the data due to the Chebyshev filter.

摘要翻译： 本发明提供一种双向低通滤波方法和装置，用于通过传输介质衰减从编码器发送到解码器的数据的基带外分量。 在本发明的一个实施例中，双向低通滤波装置包括具有第一相位响应的切比雪夫滤波器。 该切比雪夫滤波器耦合到具有第二相位响应的相位校正电路。 相位校正电路的第二相位响应被设计为与第一相位响应相反，以便抵消由切比雪夫滤波器引起的数据中组延迟的变化。

公开(公告)号：US5202590A

公开(公告)日：1993-04-13

申请号：US788491

申请日：1991-11-06

申请人： Carl F. Liepold ,  James T. Doyle

发明人： Carl F. Liepold ,  James T. Doyle

IPC分类号： H03F1/30 ,  H03K5/003 ,  H03K5/08

CPC分类号： H03K5/003 ,  H03F1/301 ,  H03K5/086

摘要： A subthreshold sense circuit for clamping an injected current at the input pins of an integrated circuit device before the injected current causes the voltage at the input pins to exceed the supply voltage by more than a diode's ON voltage. The subthreshold sense circuit is driven to operate in the linear region of the FETs. The subthreshold sense circuit of the present invention comprises level shifters, a subthreshold current source, a reference voltage generator, a subthreshold comparator, and a clamping circuit. The subthreshold current source generates a reference drain current to drive the sense circuit of the present invention in the linear region. A level shifter is connected to an input pin to shift the voltage level of the input pin by a subthreshold voltage level. The reference voltage generator provides a reference voltage to be compared with the subthreshold-shifted input voltage. The subthreshold comparator compares the subthreshold-shifted input voltage with the reference voltage level such that when the subthreshold-shifted input voltage from the input pin exceeds the reference voltage level, the subthreshold comparator will turn on. The clamping circuit is activated by the subthreshold comparator to clamp the input pin to less than one V.sub.D (ON) drop over the supply voltage by sinking the injected current at the input pin when the subthreshold comparator is turned on.

摘要翻译： 在注入电流之前，用于钳位在集成电路器件的输入引脚处的注入电流的亚阈值感测电路使得​​输入引脚处的电压超过电源电压超过二极管的导通电压。 亚阈值检测电路被驱动以在FET的线性区域中工作。 本发明的亚阈值检测电路包括电平移位器，亚阈值电流源，参考电压发生器，亚阈值比较器和钳位电路。 亚阈值电流源产生参考漏极电流，以在线性区域中驱动本发明的感测电路。 电平移位器连接到输入引脚，以将输入引脚的电压电平移位亚阈值电压电平。 参考电压发生器提供与亚阈值移位输入电压进行比较的参考电压。 亚阈值比较器将亚阈值移位输入电压与参考电压电平进行比较，使得当来自输入引脚的亚阈值移位输入电压超过参考电压电平时，子阈值比较器将导通。 钳位电路由次阈值比较器激活，通过在亚阈值比较器导通时将输入引脚上的注入电流吸收，将输入引脚钳位在电源电压下的一个VD（ON）下降。

公开(公告)号：US06252209B1

公开(公告)日：2001-06-26

申请号：US09234587

申请日：1999-01-21

申请人： Carl F. Liepold

发明人： Carl F. Liepold

IPC分类号： H05B102

CPC分类号： G05D23/1913

摘要： An adaptive temperature control circuit includes a first circuit for producing an error signal representing the difference between a preset temperature and an actual temperature and a second circuit coupled to the first circuit for producing a pulse width modulated output signal having a frequency greater than one hertz, wherein the width of the pulses is proportional to the error signal.

摘要翻译： 自适应温度控制电路包括用于产生表示预设温度和实际温度之差的误差信号的第一电路和耦合到第一电路的第二电路，用于产生频率大于1赫兹的脉宽调制输出信号， 其中脉冲宽度与误差信号成比例。

公开(公告)号：US5436628A

公开(公告)日：1995-07-25

申请号：US120583

申请日：1993-09-13

申请人： Carl F. Liepold

发明人： Carl F. Liepold

IPC分类号： H03L7/06 ,  G06F1/025 ,  H03K3/64 ,  H03K21/00 ,  H03L7/00 ,  H03M1/02

CPC分类号： G06F1/025

摘要： A programmable timing generator for creating a clock signal of variable duty cycle and frequency with a phase adjustment capability. To perform phase adjustment, the invention includes a mechanism which allows a frequency "walking" or phase adjust to be inserted by just adding or subtracting one time constant into the high or low pulse at a certain time interval. In one embodiment, the invention uses two programable counters, with only one counter counting at a time. One counter counts the high phase of a generated output signal and the other counter counts the low phase of the output signal. The two counters, or a single multiplexed counter, allow the "count high" value to be changed while the "count low" value is being generated. The timing generator only creates outputs which change on rising clock edges of an input clock resulting in an output frequency which is directly related to the input clock. The input clock is divided by a value that can be either an integer or non integer value, with steps as small as 1/4. The output clock is therefore a certain number of integer clock periods high and a certain number of integer clock periods low.

摘要翻译： 一种可编程定时发生器，用于通过相位调整功能创建可变占空比和频率的时钟信号。 为了执行相位调整，本发明包括一种机制，其允许通过在特定时间间隔内将一个时间常数加入或减去高或低脉冲来允许频率“行走”或相位调整。 在一个实施例中，本发明使用两个可编程计数器，每次仅计数一个计数器。 一个计数器对所生成的输出信号的高相位进行计数，另一个计数器对输出信号的低相位进行计数。 两个计数器或单个多路复用计数器允许在生成“计数低”值时改变“计数高”值。 定时发生器仅产生在输入时钟的上升时钟沿改变的输出，产生与输入时钟直接相关的输出频率。 输入时钟除以可以是整数或非整数值的值，步长小至1/4。 因此，输出时钟是一定数量的整数时钟周期高和一定数量的整数时钟周期低。