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公开(公告)号：EP2485397A1
公开(公告)日：2012-08-08
申请号：EP11752454.6
申请日：2011-03-30
发明人： KAMADA, Mikio
CPC分类号： H03G3/3052 , H03H11/0472 , H03H2210/012 , H03J3/20 , H03J2200/15
摘要： There is provided a filter device having a function of adjusting the center frequency of a filter. The filter device includes: a filter core unit (102) provided with an adder (109) for outputting an added signal of an input signal and a feedback signal (signal Vf), an AGC circuit for generating an amplification signal in which the added signal is amplified, and a phase shifter (111) for generating the signal Vf by shifting a phase of the amplification signal; an amplitude comparing circuit (101) for comparing the reference amplitude and the amplitude of the signal Vf; a gain control voltage generator (108) for controlling the amplification factor of the AGC circuit (110) based upon the comparison result; a frequency comparing circuit (103) for comparing the reference frequency and the frequency of the signal Vf; a phase shifter control voltage generator (117) for controlling the shift amount of the phase in the phase shifter (111) based upon the comparison result. The gain control voltage generator (108) oscillates the filter core unit (102), while the amplification factor and the shift amount are being controlled.
摘要翻译： 提供了具有调节过滤器的中心频率的功能的过滤装置。 滤波器装置包括：滤波器芯单元（102），设置有用于输出输入信号和反馈信号（信号Vf）的相加信号的加法器（109），用于产生放大信号的AGC电路，其中相加信号 以及用于通过移位放大信号的相位来产生信号Vf的移相器（111）; 振幅比较电路（101），用于比较参考振幅和信号Vf的振幅; 用于根据比较结果控制AGC电路（110）的放大系数的增益控制电压发生器（108） 频率比较电路（103），用于比较参考频率和信号Vf的频率; 基于比较结果控制移相器（111）中的相位偏移量的移相器控制电压发生器（117）。 增益控制电压发生器（108）在控制放大系数和偏移量的同时振荡滤波器核心单元（102）。
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公开(公告)号：EP1221193A4
公开(公告)日：2007-05-23
申请号：EP00967060
申请日：2000-09-28
申请人： ANALOG DEVICES INC
发明人： GOLDFARB MARC E , PALMER WYN T
CPC分类号： H03H11/0472 , H03H2210/012 , H03H2210/015 , H03H2210/023
摘要： A filter (10) having a semiconductor chip (12) and a low pass filter section (14). The low pass filter section (14) includes a filter transconductor (18, 20) and a filter capacitor (Cf). The low pass filter section (14) has a cut-off frequency related to the transconductance, (gmf), of the filter transconductor (18, 20) and the capacitance of the filter capacitor (Cf). The gm control circuit (22) includes a first oscillator (26) for producing a reference frequency. The first oscillator (26) has a portion thereof on the chip and an off-chip capacitor (Cext) and off-chip resistor (Rext). A second oscillator (28) has an on-chip capacitor (Cint). A control circuit transconductor (24) is fed by the control circuit transconductor control signal to vary the transconductance (gmc) of the control circuit transconductor in accordance with the control circuit transconductor control signal, correspondingly changing the transconductance of the filter transconductor (18, 20) and hence the cut-off frequency of the low pass filter section (14).
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公开(公告)号：EP1221193A1
公开(公告)日：2002-07-10
申请号：EP00967060.5
申请日：2000-09-28
申请人： Analog Devices, Inc.
CPC分类号： H03H11/0472 , H03H2210/012 , H03H2210/015 , H03H2210/023
摘要： A filter (10) having a semiconductor chip (12) and a low pass filter section (14). The low pass filter section (14) includes a filter transconductor (18, 20) and a filter capacitor (Cf). The low pass filter section (14) has a cut-off frequency related to the transconductance, (gmf), of the filter transconductor (18, 20) and the capacitance of the filter capacitor (Cf). The gm control circuit (22) includes a first oscillator (26) for producing a reference frequency. The first oscillator (26) has a portion thereof on the chip and an off-chip capacitor (Cext) and off-chip resistor (Rext). A second oscillator (28) has an on-chip capacitor (Cint). A control circuit transconductor (24) is fed by the control circuit transconductor control signal to vary the transconductance (gmc) of the control circuit transconductor in accordance with the control circuit transconductor control signal, correspondingly changing the transconductance of the filter transconductor (18, 20) and hence the cut-off frequency of the low pass filter section (14).
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公开(公告)号：EP0579875B1
公开(公告)日：1997-09-10
申请号：EP92202292.6
申请日：1992-07-24
IPC分类号： H03H11/04
CPC分类号： H03H11/0472 , H03H11/0433
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5.发明公开
公开(公告)号：EP0579876A1
公开(公告)日：1994-01-26
申请号：EP92202293.4
申请日：1992-07-24
IPC分类号： H03H11/04
CPC分类号： H03H11/0472 , H03H11/0433
摘要： Based on the insight that the voltage-to-current ratio or gain of a capacitor (Z) at a particular reference frequency is the product of its capacitance value with said reference frequency, a tuning system is disclosed which tunes the characteristic integrator frequency (fc) of an OTA-C integrator by making the transconductance of the operational transconductance amplifier (OTA) thereof equal to the aforementioned gain at that characteristic frequency. Therefore, the tuning system includes a first tuning path in which the OTA (or a replica thereof) is included and a second tuning path including another amplifier (B-OTA) "degenerated" by the capacitor (Z) so as to produce the required gain. The gains of both these tuning paths are then equalized by matching means (MM) generating a frequency tuning signal (VTF) which is applied to both OTA and OTA-C.
摘要翻译： 基于以下认识：特定参考频率下的电容器（Z）的电压 - 电流比或增益是其电容值与所述参考频率的乘积，公开了调谐特性积分器频率（fc ）的OTA-C积分器通过使其运算跨导放大器（OTA）的跨导等于在该特征频率处的上述增益。 因此，调谐系统包括其中包括OTA（或其复制品）的第一调谐路径和包括由电容器（Z）“退化”的另一个放大器（B-OTA）的第二调谐路径，以便产生所需的 获得。 然后通过产生施加于OTA和OTA-C两者的频率调谐信号（VTF）的匹配装置（MM）来均衡两个这些调谐路径的增益。
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公开(公告)号：EP0481529A3
公开(公告)日：1992-07-22
申请号：EP91120714.0
申请日：1987-02-16
IPC分类号： H04R25/00 , H03H11/12 , H03H11/34 , H03G11/00 , H03G7/00 , H03G11/04 , H03F1/56 , H03F1/30 , G05F3/22
CPC分类号： H03G3/3005 , H03F1/56 , H03F2203/45394 , H03G5/10 , H03G7/002 , H03G11/00 , H03G11/002 , H03H11/0433 , H03H11/0472 , H03H2210/023 , H04R25/30 , H04R25/356 , H04R25/502
摘要： A hearing aid that is compact and efficient and that provides a high degree of control over its frequency response and also over its output level versus input level characteristic. The frequency response control includes an adjustable four pole high pass filter and an adjustable four pole low pass filter, to define the pass band, and an adjustable slope filter, to define the slope within the pass band. The control over the output level versus input level characteristic includes an input AGC system with well defined, independent control of compression threshold and compression ratio, an adjustable peak clipper, and a selectable output AGC system that tracks the peak clipper setting. The hearing aid incorporates a number of novel circuits including a state variable filter with adjustable corner frequency, a filter that can be continuously adjusted from a single pole low pass characteristic to a single pole high pass characteristic, a circuit to provide a range of reference voltages to accurately set the range of control currents used to control the corner frequencies of the state variable filters, a compansion system surrounding the filter network to effectively increase its limited dynamic range, a differential voltage threshold detector, a differential voltage controlled current source with an exponential relationship of output current to differential input voltage, an adjustable clipping circuit, a voltage clamp to prevent voltage excursions from going substantially below a substrate voltage, and bias compensation circuit to supply the input bias current of a transistor.
摘要翻译： 助听器结构紧凑，高效，可对其频率响应以及输出电平与输入电平特性进行高度控制。 频率响应控制包括一个可调节的四极高通滤波器和一个可调节的四极低通滤波器，以确定通带，以及一个可调节的斜率滤波器，以确定通带内的斜率。 输出电平与输入电平特性的控制包括一个输入AGC系统，该系统具有良好定义的压缩门限和压缩比的独立控制，可调峰值削波器和跟踪峰值削波器设置的可选输出AGC系统。 助听器结合了许多新颖的电路，包括具有可调转角频率的状态可变滤波器，可以从单极低通特性连续调节为单极高通特性的滤波器，提供一定范围参考电压的电路 为了精确地设置用于控制状态可变滤波器拐角频率的控制电流的范围，围绕滤波器网络的压缩系统以有效地增加其有限的动态范围，差分电压阈值检测器，具有指数的差分压控电流源 输出电流与差分输入电压的关系，可调节限幅电路，防止电压偏移基本上低于衬底电压的电压钳位，以及偏置补偿电路以提供晶体管的输入偏置电流。
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公开(公告)号：EP0383325A3
公开(公告)日：1991-01-16
申请号：EP90102962.9
申请日：1990-02-15
CPC分类号： H03G5/24 , H03H11/0472
摘要： The center frequency (fo) of each of the analog filters (1, 2) with different selectivities each other installed in an automatic adjusting circuit is automatically adjusted in accordance with a bias input signal (Sb) which is generated by the phases detectors (3, 4) respectively associated with the analog filters (1, 2) in accordance with a frequency difference, so as to be equal to the reference frequency (fs) of an input signal (Si) applied to the two analog filters (1, 2). The bias input signal (Sb) is fed to an analog filter (31, 32, ...) to be controlled, which is formed on the same chip as that of the above two filters (1, 2). A coarse adjustment is based on the output signal of the phase detector (3) associated with the analog filter (1) with a low selectivity. A fine adjustment is based on the output signal of the phase detector (4) associated with the analog filter (2) with a high selectivity. An accuracy of matching the center frequency to the reference frequency is determined by both the selectivity of the analog filter (2) with a high selectivity and the ratio of the output signals of the two phase detectors (3, 4) in the automatic adjusting circuit.
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公开(公告)号：EP0383325A2
公开(公告)日：1990-08-22
申请号：EP90102962.9
申请日：1990-02-15
CPC分类号： H03G5/24 , H03H11/0472
摘要： The center frequency (fo) of each of the analog filters (1, 2) with different selectivities each other installed in an automatic adjusting circuit is automatically adjusted in accordance with a bias input signal (Sb) which is generated by the phases detectors (3, 4) respectively associated with the analog filters (1, 2) in accordance with a frequency difference, so as to be equal to the reference frequency (fs) of an input signal (Si) applied to the two analog filters (1, 2). The bias input signal (Sb) is fed to an analog filter (31, 32, ...) to be controlled, which is formed on the same chip as that of the above two filters (1, 2). A coarse adjustment is based on the output signal of the phase detector (3) associated with the analog filter (1) with a low selectivity. A fine adjustment is based on the output signal of the phase detector (4) associated with the analog filter (2) with a high selectivity. An accuracy of matching the center frequency to the reference frequency is determined by both the selectivity of the analog filter (2) with a high selectivity and the ratio of the output signals of the two phase detectors (3, 4) in the automatic adjusting circuit.
摘要翻译： 根据由相位检测器（3）产生的偏置输入信号（Sb）自动调整在自动调整电路中彼此安装的具有不同选择性的每个模拟滤波器（1,2）的中心频率（fo） ，4），其分别与根据频率差的模拟滤波器（1,2）相关联，以便等于施加到两个模拟滤波器（1,2）的输入信号（Si）的参考频率（fs） ）。 偏置输入信号（Sb）被馈送到要被控制的模拟滤波器（31,32，...），其形成在与上述两个滤波器（1,2）相同的芯片上。 粗调是基于与模拟滤波器（1）相关联的相位检测器（3）的输出信号，具有低选择性。 微调是基于与模拟滤波器（2）相关联的相位检测器（4）的输出信号具有高选择性的。 将中心频率与参考频率相匹配的精度由高选择性的模拟滤波器（2）的选择性和自动调整电路中的两相检测器（3,4）的输出信号的比率决定 。
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公开(公告)号：EP2880762A4
公开(公告)日：2016-03-30
申请号：EP13835271
申请日：2013-09-04
申请人： SPERO DEVICES INC
发明人： GUPTA DEV V
CPC分类号： H03H17/0294 , H03H11/0433 , H03H11/0455 , H03H11/0472 , H03H11/1252 , H03H11/1291 , H03H17/0248 , H03H2210/01 , H03H2210/012
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公开(公告)号：EP2485397B1
公开(公告)日：2015-07-29
申请号：EP11752454.6
申请日：2011-03-30
发明人： KAMADA, Mikio
CPC分类号： H03G3/3052 , H03H11/0472 , H03H2210/012 , H03J3/20 , H03J2200/15
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