公开(公告)号：US07733950B2

公开(公告)日：2010-06-08

申请号：US11318852

申请日：2005-12-28

申请人： Hyung-Jong Ko

发明人： Hyung-Jong Ko

IPC分类号： H03H7/30

CPC分类号： H04B3/145 ,  G11B20/10009 ,  G11B20/10046 ,  H03H11/0444 ,  H03H11/0472 ,  H03H11/08

摘要： Equalizers and methods of equalizing, wherein an equalizer may include includes n (where n is an integer ≧) biquad circuits each include an input node, a biquad band pass node and a biquad low pass node, a first summing circuit summing an output of the biquad band pass node of the nth biquad circuit and an output of the biquad low pass node of the nth biquad circuit, a second summing circuit subtracting the output of the biquad low pass node of the (n−1)th biquad circuit from the output of the first summing circuit and amplifying the summed result by a constant, and a third summing circuit summing an output of the second summing circuit and the output of the biquad low pass node of the nth biquad circuit, wherein the n biquad circuits are Gm-C biquad circuits each having transconductors connected in a self-feedback configuration to the biquad band pass node of the corresponding n biquad circuit. The equalizer may increase a filter bandwidth and/or maintain a specific boosting gain while reducing circuit size.

摘要翻译： 均衡器和均衡方法，其中均衡器可以包括n（其中n是整数≥）二进制电路各自包括输入节点，双二进制带通节点和双二阶低通节点，第一求和电路将 第n个二进制电路的双二进制带通节点和第n个二进制电路的二进制低通节点的输出，第二加法电路从输出中减去第（n-1）个二进制电路的二进制低通节点的输出 以及将第二加法电路的输出与第n个二进制电路的二叉低通节点的输出相加的第三求和电路，其中n个二进制电路是Gm- 各自具有以自反馈配置连接到相应的n二进制电路的二进制带通节点的跨导体的C二极二极管。 均衡器可以增加滤波器带宽和/或维持特定的升压增益同时减小电路尺寸。

公开(公告)号：US07626449B2

公开(公告)日：2009-12-01

申请号：US12139522

申请日：2008-06-16

申请人： Wei-Hsuan Tu ,  Tse-Hsiang Hsu

发明人： Wei-Hsuan Tu ,  Tse-Hsiang Hsu

IPC分类号： G06G7/12 ,  H01L31/00 ,  H03B5/04 ,  H03F3/45 ,  H03L1/02 ,  H03L7/06 ,  H04B1/10

CPC分类号： H03H11/0472 ,  H03H11/0433 ,  H03H11/0444 ,  H03H2210/012 ,  H03H2210/023 ,  H03H2210/04 ,  H03J2200/08 ,  H03J2200/18 ,  H03J2200/33 ,  H03L7/0805 ,  H03L7/093

摘要： A method for tuning a filter is provided. The method includes: enabling a VCO circuit, wherein at least a portion of the VCO circuit is selected from the filter; generating an oscillation signal by the VCO circuit according to a driving signal; comparing the oscillation signal with a reference signal and generating a comparison result; and adjusting the driving signal according to the comparison result.

摘要翻译： 提供了一种用于调整过滤器的方法。 该方法包括：启用VCO电路，其中VCO电路的至少一部分从滤波器中选择; 根据驱动信号由VCO电路产生振荡信号; 将振荡信号与参考信号进行比较并产生比较结果; 并根据比较结果调整驱动信号。

公开(公告)号：US07463086B2

公开(公告)日：2008-12-09

申请号：US11601079

申请日：2006-11-17

申请人： Seeteck Tan ,  Meng Chu ,  Xiaozhe Chen

发明人： Seeteck Tan ,  Meng Chu ,  Xiaozhe Chen

IPC分类号： H03K5/00

CPC分类号： H03H11/0472 ,  H03H11/0444

摘要： A tunable band pass filter is provided. The tunable band pass filter includes a band pass filter and a plurality of switches coupled to the band pass filter. The band pass filter includes a plurality of transconductors and a plurality of capacitors. The tunable band pass filter can be configured as a complex band pass filter or as a tuning device for tuning the center frequency of the complex band pass filter depending on the operation of the plurality of switches. The tuning device includes at least one tuning integrator and a comparator. The tuning integrator includes at least one transconductor and a capacitor. The transconductor is selected via the plurality of switches from the plurality of transconductors and the capacitor is selected via the plurality of switches from said plurality of capacitors. The selected transconductor and the selected capacitor determinines the center frequency of the band pass filter.

摘要翻译： 提供可调带通滤波器。 可调带通滤波器包括带通滤波器和耦合到带通滤波器的多个开关。 带通滤波器包括多个跨导体和多个电容器。 可调谐带通滤波器可以被配置为复带通滤波器或用作根据多个开关的操作来调谐复带通滤波器的中心频率的调谐装置。 调谐装置包括至少一个调谐积分器和比较器。 调谐积分器包括至少一个跨导体和电容器。 通过来自多个跨导体的多个开关来选择跨导体，并且经由来自所述多个电容器的多个开关选择电容器。 所选的跨导体和选定的电容器确定带通滤波器的中心频率。

公开(公告)号：US07196574B1

公开(公告)日：2007-03-27

申请号：US11157945

申请日：2005-06-22

申请人： Adam S. Vishinsky

发明人： Adam S. Vishinsky

IPC分类号： H03K5/00

CPC分类号： H03H11/22 ,  H03H11/0444 ,  H03H11/08 ,  H03H2011/0494

摘要： Direct incorporation of transmission zeros into a continuous-time active complex BP filter transfer function yields a filter having much sharper roll-off than that of an all-pole filter. The ladder filter is constructed using transconductors and capacitors only. The filter center frequency, its bandwidth and positions of transmission zeros can be electronically varied using tunable transconductors. The positions of zeros are changed by modifying cross-coupled differential transconductors connected between capacitors in parallel with the series inductors. Since all transconductors used in the filter are electronically tunable an automatic tuning system conveniently adjusts the filter center-frequency and its Q-factor.

摘要翻译： 将传输零直接并入连续时间有源复合BP滤波器传递函数产生的滤波器比全极滤波器具有更尖锐的滚降。 梯形滤波器仅用跨导电容器和电容器构成。 滤波器中心频率，其带宽和传输零点的位置可以使用可调谐的跨导体进行电子变化。 通过修改与串联电感器并联的电容器之间的交叉耦合差动跨导体来改变零点的位置。 由于滤波器中使用的所有跨导体都是电子可调谐的，自动调谐系统方便地调节滤波器中心频率及其Q因子。

公开(公告)号：US06472932B2

公开(公告)日：2002-10-29

申请号：US09774342

申请日：2001-01-31

申请人： Takashi Morie ,  Shiro Dosho

发明人： Takashi Morie ,  Shiro Dosho

IPC分类号： G06G712

CPC分类号： H03H11/0472 ,  H03F3/45995 ,  H03F3/72 ,  H03H11/0444

摘要： A transconductor which has a transconductance gm and which receives an input voltage VIn and outputs in response to the input voltage Vin an output current Iout of gm×Vin, wherein: the transconductor includes a plurality of sub-transconductors which are connected in parallel to one another; and at least one control signal is input to the plurality of sub-transconductors, and the plurality of sub-transconductors are controlled by the at least one control signal such that at least one of the plurality of sub-transconductors has a negative transconductance, whereby the transconductance gm of the transconductor can be varied.

摘要翻译： 具有跨导gm并且接收输入电压VIn并且响应于输入电压Vin输出gmxVin的输出电流Iout的跨导体，其中：所述跨导体包括彼此并联连接的多个子跨导体; 并且至少一个控制信号被输入到所述多个子跨导体，并且所述多个子跨导体由所述至少一个控制信号控制，使得所述多个次跨导体中的至少一个具有负跨导，由此 跨导体的跨导gm可以变化。

公开(公告)号：US6144981A

公开(公告)日：2000-11-07

申请号：US174944

申请日：1998-10-19

申请人： Janos Kovacs ,  Kevin J. McCall

发明人： Janos Kovacs ,  Kevin J. McCall

IPC分类号： H03H11/04 ,  G06G7/02

CPC分类号： H03H11/0444

摘要： A programmable pulse slimmer system for a low pass ladder filter includes a filter input current source for providing to a low pass ladder filter the input signal to be filtered; and a high frequency boost current source for injecting into the low pass ladder filter forward of the first inductor device a high frequency load current which is a scaled inverse replica of the input signal to provide gain at the high frequency end of the low pass band of the low pass ladder filter.

摘要翻译： 用于低通梯形滤波器的可编程脉冲微型系统包括滤波器输入电流源，用于向低通梯形滤波器提供要滤波的输入信号; 以及高频升压电流源，用于向第一电感器件前面的低通梯形滤波器注入高频负载电流，该高频负载电流是输入信号的缩放反向复制品，以在低通带的高频端提供增益 低通梯过滤器。

公开(公告)号：US08847676B2

公开(公告)日：2014-09-30

申请号：US13533501

申请日：2012-06-26

申请人： Sateh Jalaleddine

发明人： Sateh Jalaleddine

IPC分类号： H03B1/00

CPC分类号： H03H11/0444 ,  H03D7/165 ,  H03D2200/0088 ,  H03H11/0472 ,  H03H2011/0494 ,  H03H2210/023 ,  H04B1/30

摘要： A system that includes a polyphase filter comprises first and second gm-C filters with first and second variable biasing and a bias controller coupled to the first and second gm-C filters and configured to offset the first variable biasing and corresponding first gm of the first gm-C filter relative to the second variable biasing and corresponding second gm of the second gm-C filter to thus improve image rejection in the system. A corresponding method includes processing a signal in a complex polyphase filter and controlling biasing of the first gm-C filter stage relative to the second gm-C filter stage to provide a mismatched gm and thereby improve rejection of the image signal.

摘要翻译： 包括多相滤波器的系统包括具有第一和第二可变偏压的第一和第二gm-C滤波器，以及耦合到第一和第二gm-C滤波器的偏置控制器，并且被配置为偏移第一和第二可变偏置的第一可变偏压和相应的第一gm gm-C滤波器相对于第二变量偏置和相应的第二gm-C滤波器的第二gm，从而提高系统中的图像抑制。 相应的方法包括处理复杂多相滤波器中的信号并且控制第一gm-C滤波器级相对于第二gm-C滤波器级的偏置以提供不匹配的gm，从而改善图像信号的抑制。

公开(公告)号：US07511570B2

公开(公告)日：2009-03-31

申请号：US11648146

申请日：2006-12-29

申请人： David Chamla ,  Andreia Cathelin ,  Andreas Kaiser

发明人： David Chamla ,  Andreia Cathelin ,  Andreas Kaiser

IPC分类号： H03B1/00 ,  H03K5/00 ,  H04B1/10

CPC分类号： H03H11/0472 ,  H03H11/0444

摘要： A transconductance filtering device with a flexible architecture that can selectively present a different topology and/or order beginning with the same initial structure is disclosed. For example, depending on the communications standard detected, the elementary cells of the filtering circuit required to form the adapted filter are selected and connected in such a manner as to obtain the configuration desired for the filtering means. As an example, the filter may be for use with a wireless communications system forming, in particular, a cellular mobile telephone. The filter is configurable by means of at least two elementary cells of the same structure and of controllable interconnection means each having an open or closed state.

摘要翻译： 公开了一种具有柔性架构的跨导滤波装置，其能够以相同的初始结构开始选择性地呈现不同的拓扑和/或顺序。 例如，根据检测到的通信标准，选择并连接形成适配滤波器所需的滤波电路的基本单元，以获得滤波装置所需的配置。 作为示例，滤波器可以用于形成特别是蜂窝移动电话的无线通信系统。 滤波器可以通过至少两个相同结构的基本单元和每个具有打开或关闭状态的可控互连装置来配置。

公开(公告)号：US07265609B2

公开(公告)日：2007-09-04

申请号：US10557346

申请日：2004-05-14

申请人： John B. Hughes

发明人： John B. Hughes

IPC分类号： H03K5/00

CPC分类号： H03F3/45991 ,  H03F2200/294 ,  H03F2200/372 ,  H03H11/0444 ,  H03H11/08

摘要： A transconductor circuit, such as a gyrator filter, comprises an arrangement of balanced class AB transconductors, capacitors and floating MOS resistors formed by MOS transistors operating in their triode region. Tuning of the filter is effected by varying a common supply rail voltage. The circuit includes a means for producing a voltage offset from the common mode voltage of the class AB transconductors. The offset voltage is supplied to a parallel arrangement of a class AB transconductor having a transconductance and the source-drain path of a MOS transistor emulating a MOS resistor. The current output of the parallel arrangement is integrated and supplied as a control voltage to the gate electrode of the MOS transistor. By loop action the control voltage is adjusted and supplied to the floating MOS resistors.

摘要翻译： 诸如回转器滤波器的跨导电路包括平衡AB类跨导体，电容器和由其三极管区域中工作的MOS晶体管形成的浮动MOS电阻器的布置。 滤波器的调谐通过改变共同的电源轨电压来实现。 该电路包括用于产生与AB类跨导体的共模电压的偏移电压的装置。 偏移电压被提供给具有跨导的AB类跨导体并且模拟MOS电阻的MOS晶体管的源极 - 漏极路径的并联布置。 并联装置的电流输出被集成并作为控制电压提供给MOS晶体管的栅电极。 通过循环动作，控制电压被调整并提供给浮动MOS电阻。

公开(公告)号：US06400218B1

公开(公告)日：2002-06-04

申请号：US09515824

申请日：2000-02-29

申请人： Andrew G. Zocher ,  Timothy K. Coffman ,  Joseph P. Heck

发明人： Andrew G. Zocher ,  Timothy K. Coffman ,  Joseph P. Heck

IPC分类号： G06G726

CPC分类号： H03G1/0023 ,  H03H11/0444 ,  H03H11/0472 ,  H03H2210/012 ,  H03H2210/023

摘要： A variable gain control circuit (125, 127) includes a programmable operational transconductance amplifier (OTA) circuit (214) and a programmable conveying circuit (544). The conveying circuit (544) has a programmable differential circuit (550) interconnected to a pair of programming inputs (564, 566). The pair of programming inputs (564, 566) is interconnected to a pair of programming inputs (238, 240) that set the gain of the OTA circuit (214). When the OTA circuit (214) is configured as an operational transconductance filter (112, 113), the programmable differential circuit (550) can adjust the gain of the conveying circuit (544) to compensate for changes in the input impedance of the filter (112, 113). The programming inputs (238, 240) that set the input impedance and bandwidth of the filter (113, 113) also control the amount of signal current transmitted by the conveying circuit (544).

摘要翻译： 可变增益控制电路（125,127）包括可编程运算跨导放大器（OTA）电路（214）和可编程传送电路（544）。 传送电路（544）具有互连到一对编程输入（564,556）的可编程差分电路（550）。 一对编程输入（564,566）与设置OTA电路（214）的增益的一对编程输入（238,240）互连。 当OTA电路（214）被配置为运算跨导滤波器（112,113）时，可编程差分电路（550）可以调节输送电路（544）的增益，以补偿滤波器的输入阻抗的变化（ 112,113）。 设置滤波器（113,113）的输入阻抗和带宽的编程输入（238,240）也控制由传送电路（544）传输的信号电流的量。