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    • 2. 发明授权
    • Sliding bias controller for use with radio frequency power amplifiers
    • 用于射频功率放大器的滑动偏置控制器
    • US07315211B1
    • 2008-01-01
    • US11391500
    • 2006-03-28
    • Jongsoo LeeEdward T. Spears
    • Jongsoo LeeEdward T. Spears
    • H03G3/10
    • H03F1/0261H03F1/0227H03F2200/15H03F2200/411H03F2200/451
    • A two stage power amplifier circuit that employs both a DC to DC converter and sliding bias controller to improve power amplifier efficiency. The control signal that is generated by the power detector circuit to control the input voltage to the DC to DC converter is also used to provide the reference voltage that controls the sliding bias controller. The sliding bias controller reduces the quiescent current of the power amplifiers by reducing the bias currents, and thus the DC voltage at lower power output levels driving the power amplifiers. This causes the power amplifiers to operate at or near higher efficiency Class B operation at lower power output levels. As the power level increases, the sliding bias controller reduces its control on the bias currents so that the power amplifier can be driven at necessary higher power output levels.
    • 两级功率放大器电路采用DC-DC转换器和滑动偏置控制器,以提高功率放大器的效率。 由功率检测器电路产生的用于控制DC-DC转换器的输入电压的控制信号也用于提供控制滑动偏置控制器的参考电压。 滑动偏置控制器通过减少偏置电流来降低功率放大器的静态电流,从而降低驱动功率放大器的较低功率输出电平下的直流电压。 这使得功率放大器在较低功率输出电平下工作在或接近更高效率的B类操作。 随着功率电平的增加,滑动偏置控制器减少对偏置电流的控制,从而使功率放大器能够以必要的较高功率输出电平驱动。
    • 3. 发明授权
    • Radio frequency power detector and decision circuit used with DC supply voltage controlled power amplifiers
    • 射频功率检测器和决定电路与直流电源电压控制功率放大器一起使用
    • US07454179B1
    • 2008-11-18
    • US11273739
    • 2005-11-15
    • Jongsoo Lee
    • Jongsoo Lee
    • H01Q11/12
    • H03F1/0227H03F3/245H03F3/3435H03F2200/102H03F2200/192H03F2200/435H03F2200/451
    • The present invention is an active RF power detector and decision circuit, which is used to provide a DC signal to circuitry that controls the DC supply voltage to an RF power amplifier. The DC signal is proportional to the amount of RF power detected within specified operating limits. When the RF power detected is above the maximum operating limit, the DC signal is set to its maximum value. When the RF power detected is below the minimum operating limit, the DC signal is set to its minimum value. The active RF power detector and decision circuit does not require an external DC reference voltage. Since the active RF power detector and decision circuit uses active components, the input impedance is high enough to use resistors to couple the RF input signal instead of a lower impedance RF coupler and the response time is faster than a passive envelope detector.
    • 本发明是一种有源RF功率检测器和判定电路,其用于向控制到RF功率放大器的DC电源电压的电路提供DC信号。 DC信号与在规定的工作限制内检测到的RF功率的量成比例。 当检测到的RF功率高于最大工作限制时,将DC信号设置为其最大值。 当检测到的RF功率低于最小工作限制时,将DC信号设置为其最小值。 有源RF功率检测器和判定电路不需要外部直流参考电压。 由于有源RF功率检测器和判决电路使用有源分量,所以输入阻抗足够高以使用电阻器来耦合RF输入信号而不是低阻抗RF耦合器,并且响应时间比无源包络检测器快。
    • 4. 发明授权
    • Antenna tuner and method for adjusting antenna impedance
    • 天线调谐器和调整天线阻抗的方法
    • US08630597B2
    • 2014-01-14
    • US13326037
    • 2011-12-14
    • Jongsoo LeeKi Chul Kim
    • Jongsoo LeeKi Chul Kim
    • H01Q11/12H04B1/04
    • H03H7/40H04B1/0458
    • Disclosed are an antenna tuner and a method for adjusting antenna impedance. The antenna tuner includes a reference impedance resistor, a first coupler having an isolated port connected to one end of the reference impedance resistor, a second coupler having an input port connected to an output port of the first coupler and an output port connected to the antenna, and an impedance adjusting device group connected to the second coupler to adjust impedance of the antenna. An impedance controller generates an impedance adjustment control signal according to a first voltage applied to a coupled port of the first coupler, and a second voltage applied to a coupled port of the second coupler to provide the impedance adjustment control signal to the impedance adjusting device group.
    • 公开了天线调谐器和调整天线阻抗的方法。 天线调谐器包括参考阻抗电阻器,具有连接到参考阻抗电阻器一端的隔离端口的第一耦合器,具有连接到第一耦合器的输出端口的输入端口的第二耦合器和连接到天线的输出端口 以及连接到第二耦合器以调整天线的阻抗的阻抗调节装置组。 阻抗控制器根据施加到第一耦合器的耦合端口的第一电压和施加到第二耦合器的耦合端口的第二电压产生阻抗调整控制信号,以向阻抗调节装置组提供阻抗调节控制信号 。