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公开(公告)号：JP2003204230A
公开(公告)日：2003-07-18
申请号：JP2003013796
申请日：2003-01-22
Applicant: MOTOROLA INC
Abstract: PROBLEM TO BE SOLVED: To improve the efficiency of a power amplifier used in a wireless communication device. SOLUTION: Load impedance at the output of a power amplifier 304 is modified by a voltage variable capacitor (VVC) 310 to maximize the efficiency of the power amplifier. A comparator 509 generates an 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 can be coupled to the VVC. The second VVC is coupled in parallel to the first VVC. Otherwise, the VVC circuit 506 is incorporated 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. COPYRIGHT: (C)2003,JPO
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公开(公告)号：CA2176551A1
公开(公告)日：1996-12-08
申请号：CA2176551
申请日：1996-05-14
Applicant: MOTOROLA INC
Abstract: 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.
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公开(公告)号：AR002401A1
公开(公告)日：1998-03-11
申请号：AR10304996
申请日：1996-06-07
Applicant: MOTOROLA INC
Abstract: Un método y aparato único modifica la impedancia de carga en la salida de un amplificador de potencia variando un condensador variable con la tensión(VVC) (310) para maximizar la eficiencia del amplificador de potencia (304). Además deproporcio nar control de potencia, se acopla también una senal decontrol del amplificador (211) a un circuito VVC (506) para controlar la impedancia de salida del amplificador de potencia. En otras realizaciones, seacopla una senal de controldel VVC se parada (527), basada en una comparación entre la senal de control de potencia y la tensión de batería, a un VVC, o unsegundo VVC puede ser acoplado en paralelo al primer VVC. Finalmente, una realización alternativa incorpora uncircuito VVC ( 506) en la entrada delamplificador de potencia para comprensar las variaciones en la impedancia de entrada.
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Patent Agency Ranking
公开(公告)号：GB2301964A
公开(公告)日：1996-12-18
申请号：GB9611239
申请日：1996-05-30
Applicant: MOTOROLA INC
Abstract: 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.
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公开(公告)号：GB2301964B
公开(公告)日：2000-08-02
申请号：GB9611239
申请日：1996-05-30
Applicant: MOTOROLA INC
Abstract: 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.
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公开(公告)号：BR9602624A
公开(公告)日：1998-04-22
申请号：BR9602624
申请日：1996-06-04
Applicant: MOTOROLA INC
Abstract: 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.
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公开(公告)号：IT1285195B1
公开(公告)日：1998-06-03
申请号：ITRM960394
申请日：1996-06-05
Applicant: MOTOROLA INC
Abstract: 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.
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公开(公告)号：ITRM960394A1
公开(公告)日：1997-12-05
申请号：ITRM960394
申请日：1996-06-05
Applicant: MOTOROLA INC
Abstract: 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.
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