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公开(公告)号：US5966046A
公开(公告)日：1999-10-12
申请号：US959781
申请日：1997-10-29
CPC分类号： H03H11/0422 , H03F3/45479
摘要： A wide-band, high-order, programmable video filter is implemented using transimpedance-based active integrators. An input voltage which may for instance represent a composite video signal is converted to a current in a linear manner using resistors and provided to a current amplifier at low impedance virtual ground nodes. The current is multiplied by a gain factor .beta..sub.R within the current amplifier and supplied to integrating capacitors connected in a feedback configuration around a high input impedance differential amplifier to establish an integrated differential voltage output. The transimpedance-based active integrators may be interconnected to realize wide-band, high-order video filters suitable for use in accordance with CCIR 601 standards. Input voltage swings are not restricted by a transistor's limited range of linear operation or voltage swing limitations of internal nodes but rather may allowed to swing as long as the bias currents sustain input current excursions. Thus, pre-filter attenuation and post-filter amplification is not required, thereby allowing CCIR 601 standard compliant video filters to be fabricated, in accordance with the present invention, as a single chip IC.
摘要翻译： 宽带，高阶，可编程视频滤波器使用基于跨阻抗的主动积分器实现。 可以将例如表示复合视频信号的输入电压以线性方式使用电阻器转换为电流，并将其提供给低阻抗虚拟接地节点处的电流放大器。 电流乘以电流放大器内的增益因子βR，并提供给在高输入阻抗差分放大器周围的反馈配置中连接的积分电容器，以建立积分差分电压输出。 基于跨阻抗的有源积分器可以互连以实现适合于根据CCIR 601标准使用的宽带，高阶视频滤波器。 输入电压摆幅不受晶体管内部节点的线性操作或电压摆幅限制范围的限制，只要偏置电流维持输入电流偏移，可以允许摆幅。 因此，不需要预滤波器衰减和后置滤波器放大，从而允许根据本发明将CCIR 601符合标准的视频滤波器制造为单芯片IC。
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公开(公告)号：US5734294A
公开(公告)日：1998-03-31
申请号：US601920
申请日：1996-02-15
CPC分类号： H03H11/0422 , H03F3/45479
摘要： A wide band, high-order, programmable video filter is implemented using transimpedance-based active integrators. An input voltage which may for instance represent a composite video signal is converted to a current in a linear manner using resistors and provided to a current amplifier at low impedance virtual ground nodes. The current is multiplied by a gain factor .beta..sub.R within the current amplifier and supplied to integrating capacitors connected in a feedback configuration around a high input impedance differential amplifier to establish an integrated differential voltage output. The transimpedance-based active integrators may be interconnected to realize wide-band, high-order video filters suitable for use in accordance with CCIR 601 standards. Input voltage swings are not restricted by a transistor's limited range of linear operation or voltage swing limitations of internal nodes but rather may allowed to swing as long as the bias currents sustain input current excursions. Thus, pre-filter attenuation and post-filter amplification is not required, thereby allowing CCIR 601 standard compliant video filters to be fabricated, in accordance with the present invention, as a single chip IC.
摘要翻译： 使用基于跨阻抗的有源积分器实现宽带，高阶，可编程视频滤波器。 可以将例如表示复合视频信号的输入电压以线性方式使用电阻器转换为电流，并将其提供给低阻抗虚拟接地节点处的电流放大器。 电流乘以电流放大器内的增益因子βR，并提供给在高输入阻抗差分放大器周围的反馈配置中连接的积分电容器，以建立积分差分电压输出。 基于跨阻抗的有源积分器可以互连以实现适合于根据CCIR 601标准使用的宽带，高阶视频滤波器。 输入电压摆幅不受晶体管内部节点的线性操作或电压摆幅限制范围的限制，只要偏置电流维持输入电流偏移，可以允许摆幅。 因此，不需要预滤波器衰减和后置滤波器放大，从而允许根据本发明将CCIR 601符合标准的视频滤波器制造为单芯片IC。
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3.发明授权
公开(公告)号：US5901350A
公开(公告)日：1999-05-04
申请号：US727818
申请日：1996-09-30
CPC分类号： H03D7/1425 , H03D7/1433 , H03D7/1458 , H03D2200/0033 , H03D2200/0088
摘要： A semiconductor integrated circuit to provide a low distortion, large swing intermediate frequency wherein the circuit includes the function of mixing, filtering, and amplification on a single chip. A pair of differential currents are obtained from the mixer, the differential currents are filtered and conditioned, converted to a pair of differential voltages and amplified to obtain the low distortion, large swing intermediate frequency.
摘要翻译： 一种提供低失真，大摆幅中频的半导体集成电路，其中电路包括在单个芯片上进行混频，滤波和放大的功能。 从混频器获得一对差分电流，对差分电流进行滤波和调理，转换成一对差分电压并放大，以获得低失真，大摆幅中频。
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