公开(公告)号：US06836180B1

公开(公告)日：2004-12-28

申请号：US10602364

申请日：2003-06-23

申请人： Sai Kwok

发明人： Sai Kwok

IPC分类号： H03K500

CPC分类号： H03H11/22 ,  H03B27/00

摘要： An R-C polyphase network that provides bandpass shaping and amplification to maintain the quadrature phase output is provided. In one implementation, a polyphase device comprises two transistors each having a collector, a base and an emitter. Positive and negative components of an input signal are coupled to a respective base of the transistors, the transistors adapted to drive the R-C polyphase network. Inputs of the R-C polyphase network are coupled to the collectors of the transistors. The R-C polyphase network includes an inductor and has first output and a second output offset in phase. The inductor is adapted to provide bandpass filtering of the first output and the second output to reduce harmonics and spurious content in the output, as well as provide amplification of the outputs relative to the input signal.

摘要翻译： 提供了一种提供带通整形和放大以保持正交相输出的R-C多相网络。 在一个实现中，多相器件包括两个晶体管，每个具有集电极，基极和发射极。 输入信号的正和负分量耦合到晶体管的相应基极，晶体管适于驱动R-C多相网络。 R-C多相网络的输入耦合到晶体管的集电极。 R-C多相网络包括电感器，并具有第一输出和第二输出相位偏移。 电感器适于提供第一输出和第二输出的带通滤波以减少输出中的谐波和杂散内容，以及相对于输入信号提供输出的放大。

公开(公告)号：US06737911B2

公开(公告)日：2004-05-18

申请号：US10013289

申请日：2001-12-10

申请人： Udo Ausserlechner

发明人： Udo Ausserlechner

IPC分类号： H03K500

CPC分类号： H03H21/0001

摘要： The adaptive filter can be realized with a very low circuitry outlay, as a result of which the adaptive filter for the first time becomes practical for many applications. In particular, the area required by the filter is small since the large time constants that are necessary for many applications can be realized in a simple manner by the control circuit. The adaptive filter is suitable in particular for “mixed signal ASICS”, in which the required preconditions for the control circuit are already present, so that the control circuit can be realized just by means of corresponding wiring.

摘要翻译： 自适应滤波器可以用非常低的电路支出来实现，其结果是自适应滤波器首次在许多应用中变得实用。 特别地，滤波器所需的面积很小，因为可以通过控制电路以简单的方式实现许多应用所需的大的时间常数。 自适应滤波器特别适合于“混合信号ASICS”，其中已经存在控制电路所需的前提条件，从而可以通过相应的布线实现控制电路。

公开(公告)号：US06731160B1

公开(公告)日：2004-05-04

申请号：US09712414

申请日：2000-11-13

申请人： Arya Reza Behzad

发明人： Arya Reza Behzad

IPC分类号： H03K500

CPC分类号： H03G5/10 ,  H03G1/0088 ,  H03G3/001 ,  H03G3/3036 ,  H03H11/245

摘要： Often programmable gain attenuators (PGAs) are combined with high pass filters. Adjustment of the highpass filter however can have unintended effects, such as changing the step size of the PGA. By placing the resistance of the highpass filter in parallel with a programmable attenuator divider, the steps of the PGA can be minimally affected as the highpass frequency is adjusted.

公开(公告)号：US06700427B1

公开(公告)日：2004-03-02

申请号：US10229092

申请日：2002-08-28

申请人： Adam J. Sherman

发明人： Adam J. Sherman

IPC分类号： H03K500

CPC分类号： H03K5/086 ,  G01N33/48707

摘要： A filter means (36) which forms a frequency-selective attenuator (FSA) to attenuate the series resistance compensation signal (Vcomp) of a voltage clamp (5) having an undesired series resistance (Rs). Filter means (36) increases the stability and eliminates the steady-state error of series resistance compensation without compromising the compensated bandwidth, and without requiring excessive bandwidth of the compensation signal (Vcomp) to ensure stability. Filter means (36) also enables the compensated bandwidth and the rate of steady-state error elimination to be selected. Filter means (36) is particularly suited to improving the series resistance compensation of voltage clamps that measure ionic current in biological preparations, allowing rapid ionic current in excitable cells to be voltage clamped.

摘要翻译： 滤波器装置（36），其形成频率选择衰减器（FSA）以衰减具有不期望的串联电阻（Rs）的电压钳（5）的串联电阻补偿信号（Vcomp）。 滤波器装置（36）增加稳定性，消除串联电阻补偿的稳态误差，而不损害补偿带宽，并且不需要补偿信号（Vcomp）的过大带宽来确保稳定性。 滤波器装置（36）还使得能够选择补偿带宽和稳态误差消除速率。 滤波器装置（36）特别适用于改善在生物制剂中测量离子电流的电压钳的串联电阻补偿，允许可兴奋电池中的快速离子电流被电压钳位。

公开(公告)号：US06696886B1

公开(公告)日：2004-02-24

申请号：US10369080

申请日：2003-02-13

申请人： Chun-Nan Ke ,  Cheng-Yi Huang ,  Chih-Peng Fan

发明人： Chun-Nan Ke ,  Cheng-Yi Huang ,  Chih-Peng Fan

IPC分类号： H03K500

CPC分类号： H04L27/38 ,  H03L7/107 ,  H03L2207/50 ,  H04L2027/0081

摘要： An automatically adjusting gain/bandwidth loop filter suitable for a digital phase lock loop or a digital adaptive carrier recovery loop with variable loop gain/bandwidth for rapid acquisition and lower steady-state jitter is provided. The automatically adjusting gain/bandwidth loop filter comprises a variable gain/bandwidth loop filter, a tracking status detector and a gain/bandwidth control state machine. The tracking status detector observes the frequency error which is the output of the frequency tracking (integral) branch of the variable gain/bandwidth loop filter, then it outputs a tracking state of the carrier recovery loop. The loop gain/bandwidth is then adjusted by the gain/bandwidth control state machine in response of the tracking state to improve the pull-in time and steady-state carrier frequency jitter.

摘要翻译： 提供了适用于数字锁相环的自动调整增益/带宽环路滤波器或具有可变环路增益/带宽的数字自适应载波恢复环路，用于快速采集和降低稳态抖动。 自动调整增益/带宽环路滤波器包括可变增益/带宽环路滤波器，跟踪状态检测器和增益/带宽控制状态机。 跟踪状态检测器观察到可变增益/带宽环路滤波器的频率跟踪（积分）分支输出的频率误差，然后输出载波恢复循环的跟踪状态。 响应于跟踪状态，通过增益/带宽控制状态机调整环路增益/带宽，以改善引入时间和稳态载波频率抖动。

公开(公告)号：US06657483B1

公开(公告)日：2003-12-02

申请号：US10302998

申请日：2002-11-25

申请人： Debapriya Sahu

发明人： Debapriya Sahu

IPC分类号： H03K500

CPC分类号： H03H11/1291

摘要： An analog or continuous tuning loop which generates an analog signal representative of a difference of signals generated by a mirror trans-conductor circuit (having electrical characteristics similar to other such trans-conductor circuits used in a filter) and a reference circuit. The analog signal is used to adjust the trans-conductance such that the current generated by the trans-conductance circuit equals a reference current generated by the reference circuit. A filter using such trans-conductor circuits may be designed to be tuned to a desired cut-off frequency when the desired trans-conductance is achieved. An additional digital circuit generates a few digital bits, which may be used to selectively activate the respective trans-conductor elements contained in the mirror trans-conductor circuit and the filter.

摘要翻译： 模拟或连续调谐回路，其产生表示由反射镜互导体电路产生的信号的差异的模拟信号（具有与滤波器中使用的其它这种跨导体电路相似的电特性）和参考电路。 模拟信号用于调整跨导，使得由跨导电路产生的电流等于由参考电路产生的参考电流。 使用这种跨导体电路的滤波器可以被设计成当实现期望的跨导时被调谐到期望的截止频率。 附加数字电路产生几个数字位，其可以用于选择性地激活包含在反射镜互导体电路和滤波器中的相应的跨导体元件。

公开(公告)号：US06646497B2

公开(公告)日：2003-11-11

申请号：US09940569

申请日：2001-08-28

申请人： Shinichiro Tsuda

发明人： Shinichiro Tsuda

IPC分类号： H03K500

CPC分类号： H03H11/1291

摘要： A subordinate low pass filter 21 having characteristics similar to those of a main low pass filter 11 is provided. A signal of a frequency corresponding to a cut-off frequency is supplied from a signal generating circuit 22 to the subordinate LPF 21. A phase difference detecting circuit 23 detects a phase shift amount which is caused when the signal of the cut-off frequency is supplied to the subordinate LPF 21. An error detecting circuit 24 compares a value corresponding to the phase shift amount caused in the subordinate LPF 21 when the signal of the cut-off frequency is supplied with a reference value corresponding to the phase shift amount to be caused in the subordinate LPF 21 at the time of the cut-off frequency on phase characteristics. A comparison output is used as a control signal and the subordinate LPF 21 and main LPF 11 are controlled to have a desired cut-off frequency. By using multipliers of similar constructions as a phase difference detecting circuit 23 and a reference value generating circuit 25, an influence of temperature characteristics and a variation on processes can be cancelled.

公开(公告)号：US06630860B1

公开(公告)日：2003-10-07

申请号：US09666353

申请日：2000-09-20

申请人： Sudhaker Reddy Anumula ,  Thomas Clark Bryan

发明人： Sudhaker Reddy Anumula ,  Thomas Clark Bryan

IPC分类号： H03K500

CPC分类号： H03H11/1291 ,  H03L7/093

摘要： A programmable phase locked-loop (PLL) active filter circuit is provided which includes networks of cooperating bandwidth tuning components to select bandwidth ranges. The values and arrangement of the network of selectable series input (R1) resistors are chosen to be useful in both low band and high band settings. Likewise, the opamp network of feedback resistors (R2) and capacitors (C1) values are chosen to be useful in both low band and high band applications, automatically pairing with the R1 selection in response to a bandwidth range selection. These tuning components, internal to an integrated circuit, can be used for a plurality of wideband loops. External components can be used to supplement the internal components for low and high bandwidth applications.

摘要翻译： 提供了可编程锁相环（PLL）有源滤波器电路，其包括协作带宽调谐组件的网络以选择带宽范围。 可选串联输入（R1）电阻网络的值和布置被选择为在低频和高频带设置中都有用。 同样，反馈电阻（R2）和电容器（C1）值的运算放大器网络被选择为在低频带和高频带应用中都有用，响应于带宽范围选择自动与R1选择配对。 集成电路内部的这些调谐组件可用于多个宽带环路。 外部组件可用于补充低带宽和高带宽应用的内部组件。

公开(公告)号：US06437639B1

公开(公告)日：2002-08-20

申请号：US09618455

申请日：2000-07-18

申请人： Thanh Van Nguyen ,  Hashem Farrokh

发明人： Thanh Van Nguyen ,  Hashem Farrokh

IPC分类号： H03K500

CPC分类号： H03H7/12

摘要： A programmable resistive-capacitive filter circuit enabling on-chip digital control of the frequency response includes a switched resistive type voltage divider network where one of the resistors forms an element of an RC filter and wherein the voltage divider additionally provides a DC bias on an output terminal. One preferred embodiment of the invention is directed to a programmable bandpass filter including MOSFET type semiconductor devices which are utilized as switched resistive elements of the filter.

摘要翻译： 能够对频率响应进行片上数字控制的可编程电阻电容滤波器电路包括开关电阻型分压网络，其中电阻之一形成RC滤波器的元件，并且其中分压器另外在输出端上提供DC偏置 终奌站。 本发明的一个优选实施例涉及一种可编程带通滤波器，其包括用作滤波器的开关电阻元件的MOSFET型半导体器件。

公开(公告)号：US06433625B1

公开(公告)日：2002-08-13

申请号：US10003763

申请日：2001-11-01

申请人： Scott C. Savage

发明人： Scott C. Savage

IPC分类号： H03K500

CPC分类号： H03H17/0291 ,  H03H17/02

摘要： An apparatus comprising a first circuit, a second circuit, and a third circuit. The first circuit may be configured to generate a control signal in response to an output signal. The control signal may comprise a peak value of the output signal. The second circuit may be configured to generate a phase adjustment signal in response to the control signal. The third circuit may be configured to generate a second clock signal in response to the phase adjustment signal and a first clock signal. The second clock signal may clock the output signal.

摘要翻译： 一种包括第一电路，第二电路和第三电路的装置。 第一电路可以被配置为响应于输出信号而产生控制信号。 控制信号可以包括输出信号的峰值。 第二电路可以被配置为响应于控制信号而产生相位调整信号。 第三电路可以被配置为响应于相位调整信号和第一时钟信号而产生第二时钟信号。 第二个时钟信号可以对输出信号进行时钟。