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公开(公告)号：US5514950A
公开(公告)日：1996-05-07
申请号：US213594
申请日：1994-03-15
CPC分类号： H03F1/3211 , H03F3/45089 , H03F3/72 , H03F2203/45048 , H03F2203/45311 , H03F2203/45322 , H03F2203/45362 , H03F2203/45466 , H03F2203/45471 , H03F2203/45504
摘要： A differential pair arrangement is disclosed which includes between the poles of a DC supply source the series connection of two parallel first branches and a common second branch. Each first branch includes the series connection of a first impedance Q2, Q3, RL/ Q2', Q3', RL', a main path of a transistor Q1/ Q1'and a second impedance RE/RE', the control electrodes of transistors Q1/ Q1' constituting respective input terminals IN1/ IN2 of the arrangement. The second branch includes a first current source (CCS). The arrangement further includes two third branches between the DC supply source poles, each consisting of the series connection of a second current source ICS/ICS', a respective transistor main path and a resistive impedance means R11, S11, R12, S12/ R11', S11', R12', S12'. These third branches result in an increased DC current through the corresponding transistor, thereby increasing the linearity of the arrangement, whilst the DC current through the first and second impedances does not increase, thereby not increasing the needed supply voltage nor the offset voltage of the arrangement.
摘要翻译： 公开了一种差分对布置，其在直流电源的极之间包括两个平行的第一分支的串联连接和公共第二分支。 每个第一分支包括第一阻抗Q2，Q3，RL / Q2'，Q3'，RL'，晶体管Q1 / Q1'的主路径和第二阻抗RE / RE'的串联连接，晶体管的控制电极 Q1 / Q1'构成各个输入端子IN1 / IN2。 第二分支包括第一电流源（CCS）。 该配置还包括直流电源极之间的两个第三分支，每个分支由第二电流源ICS / ICS'，相应的晶体管主路径和电阻阻抗装置R11，S11，R12，S12 / R11' ，S11'，R12'，S12'。 这些第三分支导致通过相应晶体管的增加的直流电流，从而增加了布置的线性，而通过第一和第二阻抗的直流电流不增加，从而不增加所需电源电压和布置的偏移电压 。
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2.发明授权Frequency tuning system for tuning a center frequency of an analog bandpass filter 失效用于调谐模拟带通滤波器的中心频率的频率调谐系统
公开(公告)号：US5440264A
公开(公告)日：1995-08-08
申请号：US350705
申请日：1994-12-07
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 center frequency of an analog bandpass filter by tuning 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，公开了一种调谐模拟器的中心频率的调谐系统 带通滤波器，通过使其运算跨导放大器（OTA）的跨导等于该特征频率处的上述增益来调谐OTA-C积分器的特征积分器频率（fc）。 因此，调谐系统包括其中包括OTA（或其副本）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 所需增益。 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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3.发明授权Quality factor tuning system for a tunable filter and current rectifier used therein 失效用于其中使用的可调滤波器和电流整流器的质量因子调谐系统
公开(公告)号：US5471168A
公开(公告)日：1995-11-28
申请号：US407497
申请日：1995-03-17
CPC分类号： H03H11/0472 , H03H11/0433
摘要： Based on the insight that the damping of a tunable filter is both related to its quality factor as to its passband gain, an inventive tuning system is proposed which tunes the quality factor of such a filter to a desired quality factor value by tuning the passband gain of the filter to a desired gain value. Such a tuning system is particularly useful in the field of OTA-C filters and consists of first (P1) and second (P2) tuning paths including such a tunable filter (BIQUAD) and fixed gain amplifiers (B-OTA1, B-OTA2). The gain of the latter amplifiers corresponds to the desired gain values. The tuning system further includes matching means (MM) for equalizing the gains in both tuning paths (P1, P2) by generating a quality factor tuning signal (VTQ) which is applied both to the tunable filter (BIQUAD) and to a replica thereof used as master filter in a data processing path. This matching means (MM) includes current rectifiers (C-REC1, C-REC2) implemented so as to use little hardware.
摘要翻译： 基于对可调谐滤波器的阻尼与其通带增益的质量因子有关的认识，提出了一种创新的调谐系统，其通过调谐通带增益来调节这种滤波器的品质因数至期望的品质因子值 的滤波器到期望的增益值。 这种调谐系统在OTA-C滤波器领域特别有用，并且包括第一（P1）和第二（P2）调谐路径，包括这种可调滤波器（BIQUAD）和固定增益放大器（B-OTA1，B-OTA2） 。 后一放大器的增益对应于期望的增益值。 调谐系统还包括用于通过产生适用于可调谐滤波器（BIQUAD）和其所使用的副本的质量因子调谐信号（VTQ）来均衡两个调谐路径（P1，P2）中的增益的匹配装置（MM） 作为数据处理路径中的主过滤器。 该匹配装置（MM）包括实现为使用少量硬件的电流整流器（C-REC1，C-REC2）。
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公开(公告)号：US5283535A
公开(公告)日：1994-02-01
申请号：US937313
申请日：1992-09-01
CPC分类号： H03F3/45179 , H03F1/3211 , H03F3/45183 , H03F3/4569 , H03F3/45739 , H03F2203/45008 , H03F2203/45074 , H03F2203/45078 , H03F2203/45466 , H03F2203/45612 , H03F2203/45641 , H03F2203/45648
摘要： An arrangement includes a differential amplifier pair configured as first and second amplifier branches with first and second input terminals respectively. The first and second amplifier branches are connected at a junction point to a common branch which includes a current source. A control circuit regulates the current of the current source to linearize an input/output characteristic of the amplifier differential pair. The control circuit includes a negative feedback circuit having a comparator, a first input of the comparator being connected to a reference voltage terminal to which an external reference voltage is applied, a second input of the comparator being connected to the amplifier branch junction point and an output of the comparator connected for controlling the current source.
摘要翻译： 一种布置包括分别配置有第一和第二输入端的第一和第二放大器的差分放大器对。 第一和第二放大器分支在连接点处连接到包括电流源的公共分支。 控制电路调节电流源的电流以使放大器差分对的输入/输出特性线性化。 所述控制电路包括具有比较器的负反馈电路，所述比较器的第一输入端连接到施加了外部参考电压的基准电压端子，所述比较器的第二输入端连接到所述放大器支路连接点， 用于控制电流源的比较器的输出。
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