-
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
-
公开(公告)号：ZA9604876B
公开(公告)日：1997-01-07
申请号：ZA9604876
申请日：1996-06-07
Applicant: MOTOROLA INC
Inventor： KIM JIN DONG , CMKOVIC JAMES JOHN , KLOMSDORF ARMIN WERNER , PECKHAM DAVID SUTHERLAND
CPC classification number: H03F1/0233 , H03G3/3042
-
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.
-
公开(公告)号：GB2327308A
公开(公告)日：1999-01-20
申请号：GB9814790
申请日：1998-07-09
Applicant: MOTOROLA INC
Inventor： LANDHERR MICHAEL , KLOMSDORF ARMIN WERNER , PENNOCK MARK A
Abstract: A dual drain control uses a variable voltage supply on the drains of a first stage (302) and a second stage (304) to control the output power. In particular, dual drain control having a 1:1 ratio is employed at lower power levels, with single drain control at higher power levels. Such drain control could use signals from a microprocessor, or a specific circuit (203) to generate the drain voltages based upon a control voltage. Use in a cellular telephone is described. The efficiency is improved.
-
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.
-
Patent Agency Ranking
公开(公告)号：GB2356094B
公开(公告)日：2002-02-13
申请号：GB0017423
申请日：2000-07-14
Applicant: MOTOROLA INC
Inventor： KLOMSDORF ARMIN WERNER , WINKELMANN LUKE EDWARD , LANDHERR MICHAEL
Abstract: A power amplifier load adjust system includes a power amplifier and a variable impedance network coupled to the output of the power amplifier. The variable impedance network presents a plurality of impedances to the output of the power amplifier responsive to a load control signal. A control circuit generates a transmit power command and a channel frequency command. Memory stores a plurality of control values as a function of output power and frequency. A processing circuit coupled to the variable impedance network, the control circuit, and the memory retrieves the plurality of control values and uses them to generate the load control signal in response to the transmit power command and the channel frequency command.
-
7.发明专利
公开(公告)号：GB2352897B
公开(公告)日：2001-09-05
申请号：GB0017436
申请日：2000-07-14
Applicant: MOTOROLA INC
Inventor： KLOMSDORF ARMIN WERNER , ALBERTH WILLIAM P , WINKELMANN LUKE EDWARD
Abstract: A power amplifying circuit with load adjust for control of adjacent and alternate channel power. A power amplifier amplifies an input signal to produce an amplified signal. A variable impedance network presents different impedances to the output of the power amplifier responsive to a load control signal. A peak-to-average detector provides an indication of a peak-to-average ratio of the amplified signal. A controller coupled to the peak-to-average detector and the variable impedance network produces the load control signal responsive to the indication of the peak-to-average ratio.
-
公开(公告)号：GB2356094A
公开(公告)日：2001-05-09
申请号：GB0017423
申请日：2000-07-14
Applicant: MOTOROLA INC
Inventor： KLOMSDORF ARMIN WERNER , WINKELMANN LUKE EDWARD , LANDHERR MICHAEL
Abstract: A power amplifier load adjust system (200) includes a power amplifier (32) and a variable impedance network (36) coupled to the output of the power amplifier (32). The variable impedance network (36) presents a plurality of impedances to the output of the power amplifier (32) responsive to a load control signal. A control circuit generates a transmit power command and a channel frequency command. Memory (40) stores a plurality of control values as a function of output power and frequency. A processing circuit (38) coupled to the variable impedance network (36), the control circuit (20), and the memory (40) retrieves the plurality of control values and uses them to generate the load control signal in response to the transmit power command and the channel frequency command.
-
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.
-
公开(公告)号：GB2327308B
公开(公告)日：2001-05-16
申请号：GB9814790
申请日：1998-07-09
Applicant: MOTOROLA INC
Inventor： LANDHERR MICHAEL , KLOMSDORF ARMIN WERNER , PENNOCK MARK A
Abstract: According to the method and apparatus of the present disclosure, dual drain control uses a variable voltage supply on the drains of a first stage (302) and a second stage (304) to control the output power. In particular, dual drain control having a 1:1 ratio is employed at lower power levels, with single drain control at higher power levels. Such drain control could be employed by directly varying (1008, 1010) the voltage on the drains of the power amplifier, such as with signals from a microprocessor, or by a specific circuit (203) to generate the drain voltages based upon a control voltage.
-
-
-
-
-
-
-
-
-
Search Results
20
records
(took 0.141 seconds)
