公开(公告)号：US5283579A

公开(公告)日：1994-02-01

申请号：US847458

申请日：1992-03-06

申请人： Ali Tasdighi ,  Roger A. Levinson ,  Quoi V. Huynh ,  John M. Caruso

发明人： Ali Tasdighi ,  Roger A. Levinson ,  Quoi V. Huynh ,  John M. Caruso

IPC分类号： H03M1/68 ,  H03M1/76 ,  H03M1/80 ,  H03M1/66

CPC分类号： H03M1/687 ,  H03M1/765 ,  H03M1/808

摘要： A digital to analog converter (DAC) incorporates a novel subranging voltage output DAC that delivers high multiplying bandwidth while consuming low power and requires small silicon area. The higher order digital input bits (MSBS) select a voltage range (VMSB) from a first resistor divider DAC network. The VMSB is then applied to the input of a small high speed low power differential input single ended output LSB programmable attenuator amplifier. Transistor follower devices effectively buffer the MSB section to the LSB section and increase bandwidth and speed of operation as well as permitting multichannel sharing of a single precision MSB voltage divider network.

摘要翻译： 数模转换器（DAC）集成了一种新颖的基极电压输出DAC，可在消耗低功耗的同时提供高倍增带宽，并需要较小的硅面积。 高阶数字输入位（MSBS）从第一个电阻分压器DAC网络中选择一个电压范围（VMSB）。 然后将VMSB应用于小型高速低功耗差分输入单端输出LSB可编程衰减放大器的输入。 晶体管跟随器件有效地将MSB部分缓冲到LSB部分，并增加了带宽和运行速度，并允许单个精度MSB分压器网络的多通道共享。

公开(公告)号：US5923206A

公开(公告)日：1999-07-13

申请号：US827284

申请日：1997-03-27

申请人： Roger A. Levinson

发明人： Roger A. Levinson

IPC分类号： H03M1/12 ,  G06G7/14 ,  H03F3/00 ,  H03F3/72 ,  H03K5/08 ,  G06G7/12

CPC分类号： G06G7/14 ,  H03F3/005

摘要： An MOS FET circuit with a summing circuit at the input of an amplifier to provide charge cancellation. The summing circuit is capacitively coupled to the input with a charge cancellation capacitor. A separate amplifier, having components substantially the same as the components of the first amplifier, is connected through the charge cancellation capacitor to the first amplifier.

摘要翻译： 一个MOS FET电路，在放大器的输入端具有一个求和电路，以提供电荷消除。 求和电路通过电荷消除电容电容耦合到输入。 具有与第一放大器的部件基本相同的部件的单独放大器通过电荷消除电容器连接到第一放大器。

公开(公告)号：US5572212A

公开(公告)日：1996-11-05

申请号：US414997

申请日：1995-03-31

申请人： Roger A. Levinson ,  Sang T. Ngo

发明人： Roger A. Levinson ,  Sang T. Ngo

IPC分类号： H03M1/44

CPC分类号： H03M1/442

摘要： A pipelined analog to digital converter in which data samples ripple down through the pipeline of comparator stages. Each stage of the pipeline includes switch capacitor amplifiers for comparing an analog signal to a first reference voltage, to a second reference voltage, and to an average of the first and second reference voltages. Fan out of circuit components can be eliminated in succeeding stages, and error correction is provided by including overlapping of ranges passed by an earlier stage to a subsequent stage.

摘要翻译： 一种流水线模数转换器，其中数据采样纹波通过比较器级的管线。 管道的每一级都包括用于将模拟信号与第一参考电压进行比较的开关电容放大器，第二参考电压以及第一和第二参考电压的平均值。 可以在后续阶段消除电路中的电路组件，并且通过将由较早阶段传递的范围的重叠包括在后续阶段来提供错误校正。

公开(公告)号：US5294927A

公开(公告)日：1994-03-15

申请号：US868070

申请日：1992-04-13

申请人： Roger A. Levinson ,  John M. Caruso ,  Ali Tasdighi

发明人： Roger A. Levinson ,  John M. Caruso ,  Ali Tasdighi

IPC分类号： H03M1/68 ,  H03M1/76

CPC分类号： H03M1/682 ,  H03M1/765

摘要： A digital to analog converter employs an operational amplifier as an active summing device for summing a first analog voltage corresponding to most significant bits of a digital value and a second analog voltage corresponding to least significant bits of the digital value. In a multi-channel application, a single MSB DAC can be shared by all channels through first MUXs in each channel with each channel having an independent LSB DAC. Alternatively, a single LSB DAC can be shared by all channels through second MUXs in each channel. Gain of the voltage summing operational amplifier in each channel is determined by values of a resistor connecting the output of the LSB DAC to the inverting negative input of the operational amplifier and of a feedback resistor connecting the amplifier output to the inverting negative input.

摘要翻译： 数模转换器采用运算放大器作为有源求和装置，用于将对应于数字值的最高有效位的第一模拟电压与对应于数字值的最低有效位的第二模拟电压相加。 在多通道应用中，单个MSB DAC可以通过每个通道中的第一个MUX通过所有通道共享，每个通道具有独立的LSB DAC。 或者，单个LSB DAC可以通过每个通道中的第二MUX由所有通道共享。 每个通道中电压求和运算放大器的增益由连接LSB DAC的输出到运算放大器的反相负输入的电阻值以及将放大器输出连接到反相负输入的反馈电阻决定。

公开(公告)号：US5592167A

公开(公告)日：1997-01-07

申请号：US325716

申请日：1994-10-19

申请人： John M. Caruso ,  Quoi V. Huynh ,  Roger A. Levinson

发明人： John M. Caruso ,  Quoi V. Huynh ,  Roger A. Levinson

IPC分类号： H03M1/10 ,  H03M1/36

CPC分类号： H03M1/1028 ,  H03M1/365

摘要： A current driven span voltage source for use in an analog to digital converter includes a zero reference resistor serially connected with a resistor ladder. A first current source selectively passes a part of a first current through the resistor ladder to establish a span (gain) voltage range, and a second current source selectively passes a part of a second current through the zero reference resistor to establish a zero reference voltage for the span voltage range. The controlled current sources increase speed, reduce power and thermal noise, and improve temperature related performance as compared with voltage driven span and reference sources using operational amplifiers.

摘要翻译： 用于模数转换器的电流驱动跨接电压源包括与电阻梯级串联连接的零参考电阻。 第一电流源选择性地使第一电流的一部分通过电阻梯以建立跨度（增益）电压范围，并且第二电流源选择性地使一部分第二电流通过零参考电阻器以建立零参考电压 对于跨度电压范围。 与使用运算放大器的电压驱动量程和参考源相比，受控电流源可提高速度，降低功耗和热噪声，并提高温度相关性能。