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1. 发明授权

US5815805A Apparatus and method for attenuating an undesired signal in a radio transceiver 失效
标题翻译：用于衰减无线电收发器中的不期望信号的装置和方法
公开(公告)号：US5815805A
公开(公告)日：1998-09-29
申请号：US880316
申请日：1997-06-23
申请人： James John Crnkovic , Jin Dong Kim
发明人： James John Crnkovic , Jin Dong Kim
IPC分类号： H01Q1/52 , H04B1/38 , H04B1/50 , H04B1/40
CPC分类号： H01Q1/52 , H01Q1/521 , H04B1/3827
摘要： A portable radio transceiver (100) includes a transmitter (101) and a receiver (103) operating at different respective frequencies. The transmitter (101) is capable of producing an undesired signal (121) including a frequency substantially equal to the receiver operating frequency (107). A first antenna (102) is coupled to the transmitter (101). A second antenna (104) is coupled to the receiver (103) and electrically isolated (122) from the first antenna (102) by a predetermined degree such that the undesired signal (121) received by the second antenna (104) is attenuated by the predetermined degree of electrical isolation (122). An optional filter (112), coupled to an input terminal of an amplifier (113) in the transmitter (101), is adapted to attenuate the undesired signal (121) such that the undesired signal (121) received by the second antenna (104) is further attenuated. An optional directional attenuator (115), coupled between the amplifier (113) and the first antenna (102), is adapted to attenuate an interfering signal (123) received by the first antenna (102) such that the undesired signal (121) received by the second antenna (104) is further attenuated.
摘要翻译：便携式无线电收发机（100）包括在不同的相应频率下操作的发射机（101）和接收机（103）。发射机（101）能够产生包括基本上等于接收机操作频率（107）的频率的不需要的信号（121）。第一天线（102）耦合到发射机（101）。第二天线（104）被耦合到接收器（103）并且与第一天线（102）电隔离（122）预定的程度，使得由第二天线（104）接收的不需要的信号（121）被衰减预定的电隔离度（122）。耦合到发射机（101）中的放大器（113）的输入端的可选滤波器（112）适于衰减不需要的信号（121），使得由第二天线（104）接收到的不需要的信号（121））进一步减弱。耦合在放大器（113）和第一天线（102）之间的可选方向衰减器（115）适于衰减由第一天线（102）接收的干扰信号（123），使得不需要的信号（121）被接收由第二天线（104）进一步衰减。

2. 发明授权

US5673001A Method and apparatus for amplifying a signal 失效
标题翻译：用于放大信号的方法和装置
公开(公告)号：US5673001A
公开(公告)日：1997-09-30
申请号：US482158
申请日：1995-06-07
申请人： Jin Dong Kim , James John Crnkovic , Armin Werner Klomsdorf , David Sutherland Peckham
发明人： Jin Dong Kim , James John Crnkovic , Armin Werner Klomsdorf , David Sutherland Peckham
IPC分类号： H03F3/24 , H03F1/02 , H03F3/189 , H03G3/20 , H03G3/30 , H04B1/40
CPC分类号： H03F1/0233 , H03G3/3042 , Y02B60/50
摘要： A unique method and apparatus modifies the load impedance at the output of a power amplifier by varying a voltage variable capacitor (VVC) (310) to maximize the efficiency of the power amplifier (304). A comparator (509) generates amplifier control signal (211) based upon a detected power output signal (216) and a reference signal. In addition to providing power control, the control signal is also coupled to a VVC circuit (506) to control the output impedance of the power amplifier. In an alternate embodiment, a separate VVC control signal (527) based upon a comparison of the power control signal and the battery voltage is coupled to a VVC. In another alternate embodiment, a second VVC can be coupled in parallel to the first VVC. The second VVC is preferably controlled by a signal (805) based upon the current in the power amplifier. Finally, an alternate embodiment incorporates a VVC circuit (506) at the input of the power amplifier to compensate for variations in input impedance to improve other power amplifier parameters such as IM, gain, output power and noise level.
摘要翻译：独特的方法和装置通过改变电压可变电容器（VVC）（310）来修改功率放大器的输出处的负载阻抗，以最大化功率放大器（304）的效率。比较器（509）基于检测到的功率输出信号（216）和参考信号产生放大器控制信号（211）。除了提供功率控制之外，控制信号还耦合到VVC电路（506）以控制功率放大器的输出阻抗。在替代实施例中，基于功率控制信号和电池电压的比较的单独的VVC控制信号（527）耦合到VVC。在另一替代实施例中，第二VVC可以与第一VVC并联耦合。第二VVC优选地基于功率放大器中的电流由信号（805）控制。最后，替代实施例在功率放大器的输入处并入VVC电路（506），以补偿输入阻抗的变化，以改善其他功率放大器参数，例如IM，增益，输出功率和噪声电平。

3. 发明授权

US6020787A Method and apparatus for amplifying a signal 失效
标题翻译：用于放大信号的方法和装置
公开(公告)号：US6020787A
公开(公告)日：2000-02-01
申请号：US902340
申请日：1997-07-29
申请人： Jin Dong Kim , James John Crnkovic , Armin Werner Klomsdorf , David Sutherland Peckham
发明人： Jin Dong Kim , James John Crnkovic , Armin Werner Klomsdorf , David Sutherland Peckham
IPC分类号： H03F3/24 , H03F1/02 , H03F3/189 , H03G3/20 , H03G3/30 , H04B1/40 , H03G3/10 , H01Q11/12 , H03F1/30
CPC分类号： H03F1/0233 , H03G3/3042 , Y02B60/50
摘要： A unique method and apparatus modifies the load impedance at the output of a power amplifier by varying a voltage variable capacitor (VVC) (310) to maximize the efficiency of the power amplifier (304). A comparator (509) generates amplifier control signal (211) based upon a detected power output signal (216) and a reference signal. In addition to providing power control, the control signal is also coupled to a VVC circuit (506) to control the output impedance of the power amplifier. In an alternate embodiment, a separate VVC control signal (527) based upon a comparison of the power control signal and the battery voltage is coupled to a VVC. In another alternate embodiment, a second VVC can be coupled in parallel to the first VVC. The second VVC is preferably controlled by a signal (805) based upon the current in the power amplifier. Finally, an alternate embodiment incorporates a VVC circuit (506) at the input of the power amplifier to compensate for variations in input impedance to improve other power amplifier parameters such as IM, gain, output power and noise level.
摘要翻译：独特的方法和装置通过改变电压可变电容器（VVC）（310）来修改功率放大器的输出处的负载阻抗，以最大化功率放大器（304）的效率。比较器（509）基于检测到的功率输出信号（216）和参考信号产生放大器控制信号（211）。除了提供功率控制之外，控制信号还耦合到VVC电路（506）以控制功率放大器的输出阻抗。在替代实施例中，基于功率控制信号和电池电压的比较的单独的VVC控制信号（527）耦合到VVC。在另一替代实施例中，第二VVC可以与第一VVC并联耦合。第二VVC优选地基于功率放大器中的电流由信号（805）控制。最后，替代实施例在功率放大器的输入处并入VVC电路（506），以补偿输入阻抗的变化，以改善其他功率放大器参数，例如IM，增益，输出功率和噪声电平。

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