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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：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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公开(公告)号：GB2305782A
公开(公告)日：1997-04-16
申请号：GB9619773
申请日：1996-09-23
Applicant: MOTOROLA INC
Inventor： THOMPSON DAVID C , KIM JIN DONG , POWLES JON J
Abstract: A retractable antenna assembly 206 for a radio telephone provides a matched antenna impedance to a circuit in both extended and retracted positions. The antenna comprises a helical element 302 which is in direct electrical contact with the linear element. Parts of a capacitor 304, 312 are formed integrally on the linear portion of the antenna such that when the antenna is in a retracted position the capacitor contributes to the overall antenna impedance. The antenna may be housed in a grounded conductive sheath when in a retracted position. The use of a ground plane is also disclosed.
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公开(公告)号：ITRM960648A1
公开(公告)日：1998-03-23
申请号：ITRM960648
申请日：1996-09-23
Applicant: MOTOROLA INC
Inventor： THOMPSON DAVID C , KIM JIN DONG , POWLES JON J
Abstract: A retractable antenna assembly provides a substantially matched antenna impedance to a matching circuit (712) of a radiotelephone (200) whether the retractable antenna assembly is in the extended position or the retracted position. In one embodiment parts (304, 312) of a capacitor (714) are integrally formed on an upper portion of the retractable antenna assembly (206) such that when in the retracted position the capacitor (714) contributes to the overall antenna impedance. In another embodiment a capacitor (1302) is integrally formed on the lower portion of the retractable antenna assembly (900).
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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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Patent Agency Ranking
公开(公告)号：GB2288073A
公开(公告)日：1995-10-04
申请号：GB9509500
申请日：1994-08-19
Applicant: MOTOROLA INC
Inventor： MOLLER PAUL J , ALBERT MICHAEL M , ANDERSON ERIC ARVID , PHILLIPS JAMES PATRICK , KIM JIN DONG
Abstract: An antenna arrangement (402) for a wireless communication device (400) comprises a first element (404) and a second element (406). The first element (404) is coupled to circuitry (408) of the wireless communication device (400). The second element (406) is movable between a first position (see Fig. 4) and a second position (see Fig. 5) relative to the first element (404). The second element (406) is capacitively coupled to the first element (404) when the second element (406) is moved to the first position and inductively coupled to the first element (404) when the second element (406) is moved to the second position. Further, a variable reactant tuner (505), operatively coupled to the antenna element (406), variably tunes the reactance of the antenna element (406) when the antenna element (406) is moved between the first position and the second position.
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公开(公告)号：GB2258348A
公开(公告)日：1993-02-03
申请号：GB9216190
申请日：1992-07-30
Applicant: MOTOROLA INC
Inventor： NEWELL MICHAEL , KIM JIN DONG , MOUTRIE MICHAEL F
Abstract: A dielectric block filter assembly which is surface-mounted upon a circuit board. The circuit board includes an opening formed to extend therethrough, and parallel-extending projecting members, formed of a portion of the printed circuit board, which extend into the opening formed to extend through the circuit board. The dielectric block filter includes a bottom mounting surface having notches corresponding to the projecting members. Each notch includes a seating surface for seating against corresponding ones of the projecting members in mated engagement therewith.
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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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公开(公告)号：MX9602253A
公开(公告)日：1997-01-31
申请号：MX9602253
申请日：1996-06-07
Applicant: MOTOROLA INC
Inventor： KIM JIN DONG
Abstract: Un método y aparato modifica la impedancia de carga en la salida de un amplificador de potencia variando un condensador variable con la tension (VVC) (310) para maximizar la eficiencia del amplificador de potencia (304). Un comparador (509) genera una señal de control de amplificador (211) en base a una señal de salida de potencia detectada (216) y a una señal de referencia. Además de proporcionar control de potencia, la señal de control está también acoplada a un circuito condensador variable con la tension (506) para controlar la impedancia de salida del amplificador de potencia. En una realizacion alternativa, una señal de control de condensador variable con la tension (527), basada en una comparacion de la señal de control de potencia y la tension de la batería, está acoplada al condensador variable con la tension. En otra realizacion alternativa, un segundo condensador variable con la tension puede acoplarse en paralelo al primer condensador variable con la tension. El segundo condensador variable con la tension es preferentemente controlado por una señal (805) basada en la corriente del amplificador de potencia. Finalmente, una realizacion alternativa incorpora un circuito condensador variable con la tension (506) en la entrada del amplificador de potencia para compensar las variaciones en la impedancia de entrada para mejorar otros parámetros del amplificador de potencia, por ejemplo, intermodulacion, ganancia, potencia de salida y nivel de ruido.
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