公开(公告)号：WO2006049985A3

公开(公告)日：2006-06-29

申请号：PCT/US2005038534

申请日：2005-10-26

Applicant: UNIV COLUMBIA ,  OZGUN MEHMET TAMER ,  TSIVIDIS YANNIS P

Inventor： OZGUN MEHMET TAMER ,  TSIVIDIS YANNIS P

IPC: G06F19/00

CPC classification number: H04R3/00 ,  H03F3/45475 ,  H03F2203/45138 ,  H03H11/04 ,  H03H11/1217 ,  H03H11/1247

Abstract: A circuit including two operational amplifiers (116), (126) connected in parallel. For the purpose of this explanation, assume that an equivalent input noise of a circuit with one operational amplifier is too high. Where two operational amplifiers (116), (126), are connected in parallel, the signals from the operational amplifiers (116), (126) add as currents at the output node of the parallel combination.

Abstract translation: 包括并联连接的两个运算放大器（116），（126）的电路。 为了说明的目的，假设具有一个运算放大器的电路的等效输入噪声太高。 在两个运算放大器（116），（126）并联连接的情况下，来自运算放大器（116），（126）的信号作为并联组合的输出节点处的电流增加。

公开(公告)号：WO2005011112A8

公开(公告)日：2005-03-10

申请号：PCT/IB2004002485

申请日：2004-07-30

Applicant: CAVAZZONI ROBERTO

Inventor： CAVAZZONI ROBERTO

IPC: H03H20060101 ,  H03H11/12

CPC classification number: H03H11/1217 ,  H03H11/1252

公开(公告)号：WO01052414A1

公开(公告)日：2001-07-19

申请号：PCT/US2000/033934

申请日：2000-12-15

IPC: H03H11/12 ,  H03K5/00

CPC classification number: H03H11/1295 ,  H03H11/1217

Abstract: The separation of an adjacent band pass filters (11, 12, 13, 14, 15) is improved, without changing the filters, by inverting (21, 22) the output signals from alternate filters (12, 14) and not inverting the remaining output signals. All the output signals are then summed (17). The result is a deeper notch in the frequency response of adjacent filters.

Abstract translation: 通过将来自替代滤波器（12,14）的输出信号反相（21,22）而不改变滤波器，相邻带通滤波器（11,12,13,14,15）的分离被改善， 输出信号。 然后将所有输出信号相加（17）。 结果是相邻滤波器的频率响应更深刻。

公开(公告)号：WO01024352A1

公开(公告)日：2001-04-05

申请号：PCT/US2000/026741

申请日：2000-09-28

IPC: H03H11/04 ,  H03H11/12 ,  H04B1/30 ,  H03B1/00 ,  H04B1/10

CPC classification number: H03H11/1217 ,  H04B1/30

Abstract: A direct conversion receiver (10) having a homodyning section (12) and a filter (18). The filter (18) includes a plurality of serially coupled high pass filter stages (20(1)-20(n)). The high pass filter section (18) act as a dc offset correction loop. The plurality of high pass filter stages (20(1)-20(n)) also enables the integration of the needed capacitors thus minimizing external components and connections. Each one of the filter stages includes an amplifier (22) and a low pass filter (24). Each one of the low pass filters (24) is adapted to have the cutoff frequency thereof switch from an initial high cutoff frequency to a subsequent lower cutoff frequency. A high pass filter stage (20(1)-20(n)) of a direct conversion receiver (10) is provided which includes in a low pass filter feedback section (24) thereof: a capacitor (C) and a resistor section (30). The resistor section (30) includes a switch for changing the resistance of the resistance section. A switching arrangement (32) is included for charging the capacitor (C) rapidly during an initial, start-up time period or after a large step change in the gain of the amplifier (22).

Abstract translation: 具有校零部分（12）和过滤器（18）的直接转换接收器（10）。 滤波器（18）包括多个串联耦合的高通滤波器级（20（1）-20（n））。 高通滤波器部分（18）用作直流偏移校正回路。 多个高通滤波器级（20（1）-20（n））还使得能够集成所需的电容器，从而最小化外部元件和连接。 滤波器级中的每一个包括放大器（22）和低通滤波器（24）。 低通滤波器（24）中的每一个适于使其截止频率从初始高截止频率切换到随后的较低截止频率。 提供了一种直接转换接收器（10）的高通滤波器级（20（1）-20（n）），其包括在其低通滤波器反馈部分（24）中：电容器（C）和电阻器部分 30）。 电阻器部分（30）包括用于改变电阻部分的电阻的开关。 包括开关装置（32），用于在初始，启动时间段期间或在放大器（22）的增益的大幅度变化之后快速地对电容器（C）充电。

公开(公告)号：WO2009010735A1

公开(公告)日：2009-01-22

申请号：PCT/GB2008/002408

申请日：2008-07-15

Applicant: UNIVERSITY OF SUSSEX ,  PRANCE, Robert ,  PRANCE, Helen ,  HARLAND, Christopher

Inventor： PRANCE, Robert ,  PRANCE, Helen ,  HARLAND, Christopher

IPC: H03H11/12

CPC classification number: H03H11/1217 ,  H03H11/1291

Abstract: The present invention provides a sensor system and a corresponding sensing method employing the sensor system. The sensor system comprises a sensor (12) having an input (20) and an output (22), a feedback path (16) from the output to the input, and a filter (14; 92) in the feedback path. The filter comprises a narrow band filter, which is tuned or tunable to a respective one of signals that are wanted signals and signals that represent interference signals. The sensor and the filter are arranged so as to alter the relative amplitudes of the wanted signals and the interference signals in order to increase the relative amplitude of the wanted signals and reduce the relative amplitude of the interference signals.

Abstract translation: 本发明提供一种使用传感器系统的传感器系统和相应的感测方法。 传感器系统包括具有输入（20）和输出（22）的传感器（12），从输出到输入的反馈路径（16）以及反馈路径中的滤波器（14; 92）。 滤波器包括窄带滤波器，其被调谐或可调谐到所需信号和表示干扰信号的信号中的相应信号。 传感器和滤波器被布置成改变有用信号和干扰信号的相对振幅，以增加有用信号的相对幅度并减小干扰信号的相对幅度。

公开(公告)号：WO2005060095A1

公开(公告)日：2005-06-30

申请号：PCT/US2004/041204

申请日：2004-12-10

Applicant: DSP GROUP INC.

Inventor： HARVEY, Jackson

IPC: H03H11/12

CPC classification number: H03H11/1217 ,  H03H11/1256 ,  H03H2011/0494

Abstract: Pairs of second-order filters with feedback and cross coupling may be used to implement pairs of complex poles. The cross coupling may be frequency-dependent cross coupling or frequency-independent cross coupling. Frequency independent cross coupling may include coupling an internal node of a biquad filter. The pairs of second-order filters can be used together to form a complex filter. The complex filter can be used to readily provide higher order poles. The resulting complex filter can achieve higher order poles while offering reduced circuit complexity.

Abstract translation: 具有反馈和交叉耦合的二阶滤波器可用于实现成对的复极。 交叉耦合可以是频率依赖的交叉耦合或频率无关的交叉耦合。 频率无关的交叉耦合可以包括耦合双二阶滤波器的内部节点。 一对二阶滤波器可以一起使用以形成复杂滤波器。 复合滤波器可用于容易地提供高阶极点。 所得到的复合滤波器可以实现更高阶的极点，同时提供降低的电路复杂度。

公开(公告)号：WO2005046054A1

公开(公告)日：2005-05-19

申请号：PCT/JP2003/014289

申请日：2003-11-11

Applicant: 富士通株式会社 ,  美濃部 賢一 ,  松田 篤 ,  大久保 昌史

Inventor： 美濃部 賢一 ,  松田 篤 ,  大久保 昌史

IPC: H03H11/04

CPC classification number: H03H11/1217 ,  H03H11/1291 ,  H03H19/00 ,  H03H19/004 ,  H03H2250/00 ,  H03M1/007 ,  H03M1/0695 ,  H03M1/44 ,  H04B1/0057 ,  H04B1/006 ,  H04B1/406 ,  H04B1/48

Abstract: 　第１の性能に合わされた第１のアナログ回路（５３）と、上記第１のアナログ回路と協働することで上記第１の性能より高い第２の性能を実現する第２のアナログ回路（５５）とを有し、第１の性能が要求される場合には第１のアナログ回路を動作させるとともに第２のアナログ回路への電源供給を遮断し、第２の性能が要求される場合には第１のアナログ回路及び第２のアナログ回路をともに動作させるようにして、第１のアナログ回路を共有することにより回路規模の増大を抑制しながらも、要求される性能に応じて回路特性を適切に切り替えることができるようにする。

Abstract translation: 一种半导体器件，包括适于第一性能的第一模拟电路（53）和与第一模拟电路配合的第二模拟电路（55），以实现高于第一性能的第二性能，其中可以适当地切换电路特性 取决于所请求的性能，同时在请求第一性能时通过操作第一模拟电路和中断向第二模拟电路的电源来抑制电路规模的增加，同时在请求第二性能时操作第一模拟电路和第二模拟电路 共享第一个模拟电路。

公开(公告)号：WO1990014714A1

公开(公告)日：1990-11-29

申请号：PCT/NL1990000074

申请日：1990-05-18

Applicant: N.V. PHILIPS' GLOEILAMPENFABRIEKEN ,  DEVILLE, Yannick

Inventor： N.V. PHILIPS' GLOEILAMPENFABRIEKEN

IPC: H03H11/04

CPC classification number: H03H11/1217

Abstract: Semiconductor device with an activated filter in the area of high and ultrahigh frequencies, said filter having an asymmetrical inlet (E) and outet (5) which are bulk-referenced, with between said inlet and outlet: a first branch consisting of an H(s) gain amplifier and a first impedance (Z1) in series, a second branch consisting of a second impedance (Z2). The amplifier circuit of the first branch is from an amplifier circuit having an H(s) transfer function of zero order, and an amplifier circuit having a LOW-PASS H(s) transfer function of one-order, in order to set the range of operating frequencies of the activated filter. The low frequency gain of the H(s) transfer function of the first branch amplifier circuit is regulated by control means applied to this circuit in order to adjust the characteristics of the activated filter, in said range of operating frequencies, between the band-stop and all-pass filter characteristics; the transfer function of the activated filter is of order two. Applications: in frequency doublers; and 0-90° phase-shifters.

公开(公告)号：WO2006049985A2

公开(公告)日：2006-05-11

申请号：PCT/US2005/038534

申请日：2005-10-26

Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK ,  OZGUN, Mehmet, Tamer ,  TSIVIDIS, Yannis, P.

Inventor： OZGUN, Mehmet, Tamer ,  TSIVIDIS, Yannis, P.

IPC: G06J1/00

CPC classification number: H04R3/00 ,  H03F3/45475 ,  H03F2203/45138 ,  H03H11/04 ,  H03H11/1217 ,  H03H11/1247

Abstract: Dynamic power-scaling optimizes the power consumption of analog signal processors according to the signal level. The system includes dynamic gain allocation, dynamic impedance scaling and dynamic biasing. Even though the system structure changes dynamically, there are no transients at the output of the system. Moreover, the dynamic changes are immune to the presence of interferers. It has been implemented in a fifth order channel-select filter for a zero-IF GSM receiver.

Abstract translation: 动态功率放大可根据信号电平优化模拟信号处理器的功耗。 该系统包括动态增益分配，动态阻抗缩放和动态偏置。 即使系统结构动态变化，系统的输出也没有瞬变。 此外，动态变化对干扰源的存在是免疫的。 它已经在零中频GSM接收机的第五级信道选择滤波器中实现。

公开(公告)号：WO2005022744A1

公开(公告)日：2005-03-10

申请号：PCT/IB2004/051594

申请日：2004-08-28

Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V. ,  U.S. PHILIPS CORPORATION ,  FAN, Yiping

Inventor： FAN, Yiping

IPC: H03H7/06

CPC classification number: H03F3/45475 ,  H03F2203/45138 ,  H03F2203/45166 ,  H03H11/1217 ,  H03H11/1252

Abstract: A composite filter (200) includes at least two cascading filters (202, 204) designed to minimize a passband ripple in the composite filter (200). The at least two cascading filters (202, 204) may also be designed to maximize stopband rejection in the composite filter (200). Filter characteristics, such as the order, bandwidth, stopband attenuation, and ripple magnitude, for the cascading filters (202, 204) are selected in order to achieve minimal passband ripple and maximum stopband rejection in the composite filter (200). The passband ripple in the composite filter (200) is minimized or cancelled by having the passband ripple in the cascading filters (202, 204) be equal or nearly equal in magnitude but out of phase with respect to each other.

Abstract translation: 复合滤波器（200）包括设计成使复合滤波器（200）中的通带纹波最小化的至少两个级联滤波器（202,204）。 还可以将至少两个级联滤波器（202,204）设计成使复合滤波器（200）中的阻带抑制最大化。 选择用于级联滤波器（202,204）的滤波器特性，例如顺序，带宽，阻带衰减和纹波幅度，以便在复合滤波器（200）中实现最小通带纹波和最大阻带抑制。 复合滤波器（200）中的通带纹波通过使级联滤波器（202,204）中的通带纹波相等或几乎相等于或相差相位而被最小化或抵消。