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公开(公告)号：US07436262B2
公开(公告)日：2008-10-14
申请号：US10890421
申请日：2004-07-13
申请人： Kirk B. Ashby , Oliver I. Werther
发明人： Kirk B. Ashby , Oliver I. Werther
IPC分类号： H03F3/45
CPC分类号： H03G1/0023 , H03F3/45098 , H03F2203/45454 , H03F2203/45671 , H03F2203/45722
摘要： Disclosed are systems and methods which provide very linear amplification of signals using a linearized transconductance circuit. A transconductance amplifier configuration is shown which provides highly linearized operation utilizing a Darlington pair feedback circuit. Also shown are gain control configurations in which current steering circuitry is adapted to operate in its most linear region.
摘要翻译： 公开了使用线性跨导电路提供信号的非常线性放大的系统和方法。 示出了跨导放大器配置，其使用达林顿对反馈电路提供高度线性化的操作。 还示出了增益控制配置，其中电流控制电路适于在其最直线的区域中操作。
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公开(公告)号：US06888406B2
公开(公告)日：2005-05-03
申请号：US10217076
申请日：2002-08-12
申请人： Kirk B. Ashby , Oliver I. Werther
发明人： Kirk B. Ashby , Oliver I. Werther
CPC分类号： H03G1/0023 , H03F3/45098 , H03F2203/45454 , H03F2203/45671 , H03F2203/45722
摘要： Disclosed are systems and methods which provide very linear amplification of signals using a linearized transconductance circuit. A transconductance amplifier configuration is shown which provides highly linearized operation utilizing a Darlington pair feedback circuit. Also shown are gain control configurations in which current steering circuitry is adapted to operate in its most linear region.
摘要翻译： 公开了使用线性跨导电路提供信号的非常线性放大的系统和方法。 示出了跨导放大器配置，其使用达林顿对反馈电路提供高度线性化的操作。 还示出了增益控制配置，其中电流控制电路适于在其最直线的区域中操作。
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3.发明申请公开(公告)号：US20080246875A1
公开(公告)日：2008-10-09
申请号：US12140709
申请日：2008-06-17
IPC分类号： H04N7/01
CPC分类号： H03D7/166
摘要： Frequency translation, such as frequency up conversion of a video baseband or intermediate frequency to a desired frequency division broadcast channel, is provided utilizing a single sideband or image reject mixer and filtering having relaxed selectivity requirements. According to a preferred embodiment, a first single sideband mixer accepts an input signal at an intermediate frequency and up converts this signal to a high intermediate frequency. The image rejection provided by the single sideband mixer in combination with simple filtering provide sufficient signal quality to achieve desired levels of desired signal isolation, such as on the order of 40 dB. Preferably, a second single sideband mixer accepts the high intermediate frequency signal and down converts this signal to a desired transmission or broadcast frequency. The image rejection provided by the single sideband mixers in combination with simple filtering provide sufficient desired signal isolation, such as on the order of 40 dB, thereby relax the linearity requirements of amplifiers utilized in the frequency translation system. A preferred embodiment of the present invention disposes all or substantially all the frequency translation circuit elements on a single substrate.
摘要翻译： 使用单个边带或图像拒绝混合器以及具有放宽的选择性要求的滤波器来提供频率转换，诸如将视频基带或中频上变频到期望的频分广播信道。 根据优选实施例，第一单边带混频器接收中频处的输入信号，并将该信号上变频到高中频。 由单边带混频器提供的图像抑制与简单滤波相结合提供了足够的信号质量以达到期望的信号隔离度，例如大约40dB。 优选地，第二单边带混频器接受高中频信号，并将该信号下变频到期望的传输或广播频率。 由单边带混频器提供的图像抑制与简单滤波相结合提供了足够的期望信号隔离度，例如大约40dB，从而放宽了在频率转换系统中使用的放大器的线性度要求。 本发明的优选实施例将所有或基本上所有的频率平移电路元件配置在单个衬底上。
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4.发明授权公开(公告)号：US07184724B1
公开(公告)日：2007-02-27
申请号：US09552760
申请日：2000-04-18
IPC分类号： H04B1/10
CPC分类号： H03D7/166
摘要： Frequency translation, such as frequency up conversion of a video baseband or intermediate frequency to a desired frequency division broadcast channel, is provided utilizing a single sideband or image reject mixer and filtering having relaxed selectivity requirements. According to a preferred embodiment, a first single sideband mixer accepts an input signal at an intermediate frequency and up converts this signal to a high intermediate frequency. The image rejection provided by the single sideband mixer in combination with simple filtering provide sufficient signal quality to achieve desired levels of desired signal isolation, such as on the order of 40 dB. Preferably, a second single sideband mixer accepts the high intermediate frequency signal and down converts this signal to a desired transmission or broadcast frequency. The image rejection provided by the single sideband mixers in combination with simple filtering provide sufficient desired signal isolation, such as on the order of 40 dB, thereby relax the linearity requirements of amplifiers utilized in the frequency translation system. A preferred embodiment of the present invention disposes all or substantially all the frequency translation circuit elements on a single substrate.
摘要翻译： 使用单个边带或图像拒绝混合器以及具有放宽的选择性要求的滤波器来提供频率转换，诸如将视频基带或中频上变频到期望的频分广播信道。 根据优选实施例，第一单边带混频器接收中频处的输入信号，并将该信号上变频到高中频。 由单边带混频器提供的图像抑制与简单滤波相结合提供了足够的信号质量以达到期望的信号隔离度，例如大约40dB。 优选地，第二单边带混频器接受高中频信号，并将该信号下变频到期望的传输或广播频率。 由单边带混频器提供的图像抑制与简单滤波相结合提供了足够的期望信号隔离度，例如大约40dB，从而放宽了在频率转换系统中使用的放大器的线性度要求。 本发明的优选实施例将所有或基本上所有的频率平移电路元件配置在单个衬底上。
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公开(公告)号：US6020786A
公开(公告)日：2000-02-01
申请号：US128032
申请日：1998-08-03
申请人： Kirk B. Ashby
发明人： Kirk B. Ashby
CPC分类号： H03F3/45479 , H03G1/04
摘要： A variable gain amplifier (VGA) may be useful in applications where the input amplitude is constant but the output must vary over a wide range. Some VGAs have a desirable exponential control characteristic, but an undesirable temperature characteristic that causes the gain to change with temperature when the control voltage is held constant with respect to temperature. The present invention is directed to a circuit that will convert a control signal (e.g., a voltage) that is constant with temperature into a voltage that can be applied to a VGA in such a way that the temperature variation of the VGA is eliminated without changing the desirable exponential control characteristics.
摘要翻译： 可变增益放大器（VGA）可能在输入幅度恒定但输出必须在较宽范围内变化的应用中有用。 一些VGA具有期望的指数控制特性，但是当控制电压相对于温度保持恒定时，导致增益随温度变化的不期望的温度特性。 本发明涉及一种电路，其将将温度恒定的控制信号（例如，电压）转换成可以施加到VGA的电压，使得VGA的温度变化被消除而不改变 期望的指数控制特性。
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公开(公告)号：US6114912A
公开(公告)日：2000-09-05
申请号：US298048
申请日：1999-04-22
CPC分类号： H03F3/04 , G05F1/56 , H03F2200/294 , H03F2200/372
摘要： The voltage-controlled current source receives a control voltage from an operational amplifier which itself receives a reference voltage at one input from a bias circuit. The voltage-controlled current source applies current to the base of the amplifier's main transistor. The base of the transistor is also coupled to the input node of the amplifier through a DC-blocking capacitor and through a feedback loop to the other input of the operational amplifier. The voltage-controlled current source operates to maintain the voltage at the base of the transistor relatively constant for a wide range of input signal levels. As a result, the amplifier is able to operate at relatively low power supply voltages (e.g., as low as 2V) without suffering from premature gain compression at relatively high input signal levels (e.g., as high as 0.4V).
摘要翻译： 压控电流源从运算放大器接收控制电压，运算放大器本身在偏置电路的一个输入端接收参考电压。 压控电流源将电流施加到放大器主晶体管的基极。 晶体管的基极还通过隔直流电容器连接到放大器的输入节点，并通过反馈回路耦合到运算放大器的另一个输入端。 电压控制电流源用于在宽范围的输入信号电平下保持晶体管基极处的电压相对恒定。 结果，放大器能够在相对较低的电源电压（例如，低至2V）下工作，而不会在相对高的输入信号电平（例如高达0.4V）下遭受过早增益压缩。
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公开(公告)号：US6023196A
公开(公告)日：2000-02-08
申请号：US127752
申请日：1998-08-03
申请人： Kirk B. Ashby , Paul C. Davis , Michael D. Womac
发明人： Kirk B. Ashby , Paul C. Davis , Michael D. Womac
CPC分类号： H03F3/45538 , H03D7/1433 , H03D7/1441 , H03D7/145 , H03D7/1458 , H03D7/1491 , H03F1/302 , H03F3/45085 , H03F3/45089 , H03D2200/0033 , H03D2200/0043 , H03F2200/372 , H03F2203/45311 , H03F2203/45386 , H03F2203/45498 , H03F2203/45501 , H03F2203/45542 , H03F2203/45544 , H03F2203/45561 , H03F2203/45702
摘要： In low-voltage circuits, there is often insufficient voltage to use a current source to bias a transconductance amplifier stage. This is particularly true in mixers where a switching circuit must be stacked on top of the transconductance input stage. One way around this problem is to get "double-duty" out of the input differential pair, using it both for gain stage and for DC bias. This is done by AC coupling in a high-frequency input signal, while using a low-frequency, DC-coupled circuit to establish the proper bias level. One common technique is to use a simple current mirror scheme to establish the DC level. Proper biasing using this technique requires good matching of resistance. In some implementations of transconductance amplifiers, particularly those that use inductors as degeneration elements, series resistance of the inductor and interconnect resistance can cause significant errors in the bias current. This invention addresses that problem by using an operational amplifier with a current-sensing resistor and a low-frequency feedback loop to compensate automatically for any resistance errors. The operational amplifier drives the feedback voltage (generated in accordance with the sensed voltage at the current-sensing resistor and applied to one input of the operational amplifier) towards a reference voltage that is applied to the other input of the operational amplifier to bias the transistor(s) in the transconductance amplifier for desired operating conditions.
摘要翻译： 在低电压电路中，通常电压不足以使用电流源偏置跨导放大器级。 在需要在跨导输入级的顶部堆叠开关电路的混频器中尤其如此。 解决这个问题的一个方法是从输入差分对中获得“双重责任”，将其用于增益级和直流偏置。 这是通过高频输入信号中的交流耦合完成的，同时使用低频直流耦合电路建立适当的偏置电平。 一种常见的技术是使用简单的电流镜方案建立直流电平。 使用这种技术的适当偏置需要良好的电阻匹配。 在跨导放大器的一些实施方式中，特别是使用电感器作为退化元件的那些，电感器的串联电阻和互连电阻可能导致偏置电流的显着误差。 本发明通过使用具有电流检测电阻器和低频反馈回路的运算放大器来自动补偿任何电阻误差来解决该问题。 运算放大器驱动反馈电压（根据检测到的电流感测电压产生并施加到运算放大器的一个输入端）朝向施加到运算放大器的另一个输入的参考电压以偏置晶体管 （s）在跨导放大器中用于期望的操作条件。
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公开(公告)号：US5635892A
公开(公告)日：1997-06-03
申请号：US350358
申请日：1994-12-06
CPC分类号： H01F17/0006 , H01F27/346 , H01F2017/0053 , H01F2017/0066 , H01F2017/0086 , H01F2027/348
摘要： An inductive structure is provided which displays an increased self-inductance and improved Q at high frequencies. The improvement resides in the disposition proximate the inductive structure an amount of magnetic material to increase mutual inductance between adjacent portions of the inductor's conductive path with current flow.
摘要翻译： 提供了一种电感结构，其显示出高频下增加的自感和改善的Q。 改进在于接近感应结构的磁性材料的配置，以增加电感器的导电路径的相邻部分与电流之间的互感。
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9.发明授权公开(公告)号：US07711346B2
公开(公告)日：2010-05-04
申请号：US12140709
申请日：2008-06-17
CPC分类号： H03D7/166
摘要： Frequency translation, such as frequency up conversion of a video baseband or intermediate frequency to a desired frequency division broadcast channel, is provided utilizing a single sideband or image reject mixer and filtering having relaxed selectivity requirements. According to a preferred embodiment, a first single sideband mixer accepts an input signal at an intermediate frequency and up converts this signal to a high intermediate frequency. The image rejection provided by the single sideband mixer in combination with simple filtering provide sufficient signal quality to achieve desired levels of desired signal isolation, such as on the order of 40 dB. Preferably, a second single sideband mixer accepts the high intermediate frequency signal and down converts this signal to a desired transmission or broadcast frequency. The image rejection provided by the single sideband mixers in combination with simple filtering provide sufficient desired signal isolation, such as on the order of 40 dB, thereby relax the linearity requirements of amplifiers utilized in the frequency translation system. A preferred embodiment of the present invention disposes all or substantially all the frequency translation circuit elements on a single substrate.
摘要翻译： 使用单个边带或图像拒绝混合器以及具有放宽的选择性要求的滤波器来提供频率转换，诸如将视频基带或中频上变频到期望的频分广播信道。 根据优选实施例，第一单边带混频器接收中频处的输入信号，并将该信号上变频到高中频。 由单边带混频器提供的图像抑制与简单滤波相结合提供了足够的信号质量以达到期望的信号隔离度，例如大约40dB。 优选地，第二单边带混频器接受高中频信号，并将该信号下变频到期望的传输或广播频率。 由单边带混频器提供的图像抑制与简单滤波相结合提供了足够的期望信号隔离度，例如大约40dB，从而放宽了在频率转换系统中使用的放大器的线性度要求。 本发明的优选实施例将所有或基本上所有的频率平移电路元件配置在单个衬底上。
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10.发明授权公开(公告)号：US07403761B2
公开(公告)日：2008-07-22
申请号：US11523785
申请日：2006-09-19
CPC分类号： H03D7/166
摘要： Frequency translation, such as frequency up conversion of a video baseband or intermediate frequency to a desired frequency division broadcast channel, is provided utilizing a single sideband or image reject mixer and filtering having relaxed selectivity requirements. According to a preferred embodiment, a first single sideband mixer accepts an input signal at an intermediate frequency and up converts this signal to a high intermediate frequency. The image rejection provided by the single sideband mixer in combination with simple filtering provide sufficient signal quality to achieve desired levels of desired signal isolation, such as on the order of 40 dB. Preferably, a second single sideband mixer accepts the high intermediate frequency signal and down converts this signal to a desired transmission or broadcast frequency. The image rejection provided by the single sideband mixers in combination with simple filtering provide sufficient desired signal isolation, such as on the order of 40 dB, thereby relax the linearity requirements of amplifiers utilized in the frequency translation system. A preferred embodiment of the present invention disposes all or substantially all the frequency translation circuit elements on a single substrate.
摘要翻译： 使用单个边带或图像拒绝混合器以及具有放宽的选择性要求的滤波器来提供频率转换，诸如将视频基带或中频上变频到期望的频分广播信道。 根据优选实施例，第一单边带混频器接收中频处的输入信号，并将该信号上变频到高中频。 由单边带混频器提供的图像抑制与简单滤波相结合提供了足够的信号质量以达到期望的信号隔离度，例如大约40dB。 优选地，第二单边带混频器接受高中频信号，并将该信号下变频到期望的传输或广播频率。 由单边带混频器提供的图像抑制与简单滤波相结合提供了足够的期望信号隔离度，例如大约40dB，从而放宽了在频率转换系统中使用的放大器的线性度要求。 本发明的优选实施例将所有或基本上所有的频率平移电路元件配置在单个衬底上。
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