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    • 3. 发明授权
    • Method and apparatus for reducing distortion in a power amplifier
    • 减少功率放大器失真的方法和装置
    • US5886572A
    • 1999-03-23
    • US900584
    • 1997-07-25
    • Ronald Gene MyersBernard Eugene SigmonRobert Michael Jackson
    • Ronald Gene MyersBernard Eugene SigmonRobert Michael Jackson
    • H03F1/32H03C5/00H03F1/02H03F3/38
    • H03F1/0222H03C5/00
    • A method and apparatus for efficient power amplification with low distortion includes an envelope detector (220), a difference amplifier (130), an envelope amplifier (270), and a power amplifier (260). A feedback path is provided from the output through a second envelope detector (120) to the difference amplifier (130). The feedback circuit operates on the bandwidth of the envelope of the RF signal rather than at the RF bandwidth. An envelope amplifier (270) includes a difference amplifier (272), a pulsewidth modulator (275), a driver (280), switching transistors (285), a low pass filter (290), and a voltage scaler (292). A feedback path within the envelope amplifier reduces the time delay introduced by low pass filter (290). The combined feedback loops work together to reduce distortion and lower intermodulation products.
    • 用于低失真的高效功率放大的方法和装置包括包络检测器(220),差分放大器(130),包络放大器(270)和功率放大器(260)。 从输出端通过第二包络检测器(120)向差分放大器(130)提供反馈路径。 反馈电路在RF信号的包络带宽上工作,而不是在RF带宽上工作。 包络放大器(270)包括差分放大器(272),脉宽调制器(275),驱动器(280),开关晶体管(285),低通滤波器(290)和电压调节器(292)。 包络放大器内的反馈路径减少了由低通滤波器(290)引入的时间延迟。 组合的反馈回路一起工作,以减少失真和降低互调产物。
    • 8. 发明授权
    • Power amplification apparatus and method therefor
    • 功率放大装置及其方法
    • US6028485A
    • 2000-02-22
    • US128600
    • 1998-08-03
    • Bernard Eugene SigmonRonald Gene Myers
    • Bernard Eugene SigmonRonald Gene Myers
    • H03F1/02H03F3/68H03F3/60
    • H03F1/0277
    • A method and apparatus for efficiently amplifying input signals includes multiple amplifiers (20, 30). Each amplifier receives a signal from a power divider (12) where the input signal is split with substantially equal phase. Each amplifier drives a load (40) through a parallel coupled line pair (26, 36). The parallel coupled line pairs are preferably implemented in micro-strip or strip line technology. Each amplifier includes gate bias inputs (24, 34) and drain bias inputs (22, 32). The gate bias inputs can be biased equally and the drain bias inputs can be biased equally, resulting in a parallel, power combined, amplifier configuration. Alternately, the drain bias inputs can be staggered, or the gate bias inputs can be staggered to increase efficiency.
    • 用于有效地放大输入信号的方法和装置包括多个放大器(20,30)。 每个放大器接收来自功率分配器(12)的信号,其中输入信号以基本相等的相位被分离。 每个放大器通过并联耦合线对(26,36)驱动负载(40)。 平行耦合线对优选地以微带或带状线技术实现。 每个放大器包括栅极偏置输入(24,34)和漏极偏置输入(22,32)。 栅极偏置输入可以均匀偏置,并且漏极偏置输入可以均匀偏置,从而产生并联的功率组合放大器配置。 或者,漏极偏置输入可以交错,或者栅极偏置输入可以交错以提高效率。
    • 9. 发明授权
    • High efficiency power amplifier circuit with wide dynamic backoff range
    • 具有宽动态退避范围的高效率功率放大器电路
    • US6157253A
    • 2000-12-05
    • US389903
    • 1999-09-03
    • Bernard Eugene SigmonRonald Gene Myers
    • Bernard Eugene SigmonRonald Gene Myers
    • H03F1/02H03F3/21H03F3/38
    • H03F1/0222H03F1/0261H03F3/211H03F2200/102H03F2200/504H03F2200/511H03F2203/21106H03F2203/21142
    • A radio frequency signal (FIG. 2, 205) is sampled and the sample is conveyed to a video detector (220). The detected envelope amplitude is sent to an envelope tracking circuit (280), a comparator (230), and an envelope tracking and gate biasing circuit (240). Based on the instantaneous value of the envelope amplitude, the comparator (230) selects one of the available supply voltages (340) via switch drivers (270). The selected one of the available supply voltages (340) is adjusted by the envelope tracking circuit (280) and the resulting voltage output (282) is supplied to the drains of the power amplifiers (390), thus enabling operation near saturation. As the instantaneous value of the envelope amplitude increases, the comparator (230) selects higher supply voltages (340) which increases the voltage conveyed to the power amplifiers (390), thereby increasing their power output. In order to maintain constant gain performance, the envelope tracking and gate biasing circuit (240) modifies the gate bias inversely with the changes the drain voltage.
    • 对射频信号(图2,205)进行采样,并将样本传送到视频检测器(220)。 检测到的包络幅度被发送到包络跟踪电路(280),比较器(230)以及包络跟踪和门偏置电路(240)。 基于包络幅度的瞬时值,比较器(230)经由开关驱动器(270)选择可用电源电压(340)中的一个。 所选择的一个可用电源电压(340)由包络跟踪电路(280)调节,并且所得到的电压输出(282)被提供给功率放大器(390)的漏极,从而使得能够接近饱和。 随着包络幅度的瞬时值增加,比较器(230)选择较高的电源电压(340),其增加传送到功率放大器(390)的电压,从而增加它们的功率输出。 为了保持恒定的增益性能,包络跟踪和栅极偏置电路(240)随着漏极电压的变化而与栅极偏置相反地改变。