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1.发明授权Amplifier with active bias compensation and method for adjusting quiescent current 有权具有有源偏置补偿的放大器和调整静态电流的方法
公开(公告)号：US6046642A
公开(公告)日：2000-04-04
申请号：US149520
申请日：1998-09-08
CPC分类号： H03F3/193 , H03F1/301 , H03F3/45089 , H03F3/45475 , H03F3/45538 , H03F2203/45392 , H03F2203/45498 , H03F2203/45542 , H03F2203/45638
摘要： An active bias compensation circuit (110) senses a quiescent current flowing in an amplifier (130) and adjusts the quiescent current to maintain an optimal DC biasing of the amplifier (130) over a wide range of factors, e.g., temperature variation, process variation, history of the amplifier (130), etc. The compensation circuit (110) includes two transistors (101, 102) forming a difference amplifier. A sensing voltage proportional to the quiescent current and a reference voltage are applied to the base electrodes of the two transistors (101, 102), which generates a bias signal in response to a difference between the sensing voltage and the reference voltage. The bias signal adjusts the quiescent current in the amplifier (130).
摘要翻译： 有源偏置补偿电路（110）感测在放大器（130）中流动的静态电流并且调整静态电流以在宽范围的因素（例如，温度变化，过程变化）上维持放大器（130）的最佳DC偏置 ，放大器（130）的历史等。补偿电路（110）包括形成差分放大器的两个晶体管（101,102）。 与静态电流成比例的感测电压和参考电压施加到两个晶体管（101,102）的基极，其响应于感测电压和参考电压之间的差产生偏置信号。 偏置信号调节放大器（130）中的静态电流。
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公开(公告)号：US6091942A
公开(公告)日：2000-07-18
申请号：US755861
申请日：1996-12-02
CPC分类号： H03G3/3036
摘要： An K-band amplifier circuit (10) with two samplers (12, 18) coupled to detectors (22, 26) that detect an input and an output RF signal level. These two reference signals are provided to a differential gain control circuit (24) which is coupled to one or more variable gain amplifier (VGA) (14) stages. The VGAs compensate for the gain of an entire chain of amplifiers (16). When the individual amplifier gains vary for any reason, (i.e., process, temperature effects or end of life degradation) the variation in gain causes higher or lower levels of detected output reference signals for a given RF input signal. The gain control circuit (24) drives the VGA (14) up or down as appropriate. By maintaining a constant offset in input and output reference control signals, the gain control circuit (24) drives the amplifier chain (16) to a constant gain.
摘要翻译： 具有耦合到检测器（22,26）的两个采样器（12,18）的K波段放大器电路（10），其检测输入和输出RF信号电平。 这两个参考信号被提供给耦合到一个或多个可变增益放大器（VGA）（14）级的差分增益控制电路（24）。 VGA补偿整个放大器链（16）的增益。 当单个放大器增益由于任何原因（即，处理，温度效应或寿命终止退化）而变化时，增益的变化导致给定RF输入信号的检测到的输出参考信号的较高或较低水平。 增益控制电路（24）适当地驱动VGA（14）上或下。 通过保持输入和输出参考控制信号中的恒定偏移，增益控制电路（24）将放大器链（16）驱动到恒定增益。
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公开(公告)号：US5990712A
公开(公告)日：1999-11-23
申请号：US943439
申请日：1997-10-03
IPC分类号： H03B19/00
CPC分类号： H03B19/00
摘要： A harmonic generator (20) converts an input signal (24) at a fundamental frequency (28) into an output signal (32) at a harmonic frequency (34). A non-linear device (22) converts the input signal (24) into an intermediate signal (38) in which the harmonic frequency (34) has a maximized amplitude (40) determined by a conduction angle (26). A harmonic filter (68) produces a filtered signal (70) proportional to the amplitude (40) of the harmonic frequency (34) within the intermediate signal (38). A detector (80) produces a control signal (82) proportional to the amplitude of the filtered signal (70). A control circuit (84) produces a variable bias signal (50) for non-linear device (22), bias signal (50) being proportional to the amplitude of the control signal (82) and determining the conduction angle (26). An output filter (88) converts the intermediate signal (38) into an output signal (32) at the harmonic frequency (34).
摘要翻译： 谐波发生器（20）将基频（28）的输入信号（24）转换成谐波频率（34）的输出信号（32）。 非线性装置（22）将输入信号（24）转换成其中谐波频率（34）具有由导通角（26）确定的最大振幅（40）的中间信号（38）。 谐波滤波器（68）产生与中间信号（38）内的谐波频率（34）的振幅（40）成比例的滤波信号（70）。 检测器（80）产生与滤波信号（70）的幅度成比例的控制信号（82）。 控制电路（84）产生用于非线性装置（22）的可变偏置信号（50），偏置信号（50）与控制信号（82）的振幅成比例并确定导通角（26）。 输出滤波器（88）将中间信号（38）转换成谐波频率（34）的输出信号（32）。
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公开(公告)号：US5712593A
公开(公告)日：1998-01-27
申请号：US596533
申请日：1996-02-05
CPC分类号： H03G3/3042
摘要： A power amplifier (10) suitable for satellite cellular communication systems provides highly efficient linear amplification of noise-like RF signals that have multiple carriers spread over a large instantaneous bandwidth. The amount of distortion present in the output is detected (14, 16, 18) and a feedback signal is provided to control the bias point of the active devices. As drive levels increase, the increased harmonic distortion power detected causes the power amplifier bias to increase thus reducing distortion. The control circuit (20) continually re-biases the power amplifier (12) for maximum efficiency for a predetermined level of distortion. The control circuit (20) may be adjusted to maximize efficiency while maintaining an allowable distortion level over the entire dynamic range of the devices.
摘要翻译： 适用于卫星蜂窝通信系统的功率放大器（10）提供了具有多个载波在大的瞬时带宽上扩展的类噪声RF信号的高效线性放大。 检测输出中出现的失真量（14,16,18），并提供反馈信号来控制有源器件的偏置点。 当驱动电平增加时，检测到的增加的谐波失真功率导致功率放大器偏置增加，从而减少失真。 控制电路（20）为了达到预定的失真水平而最大限度地重新偏置功率放大器（12）。 可以调整控制电路（20）以最大化效率，同时在整个设备的整个动态范围内保持允许的失真水平。
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