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公开(公告)号：EP1536556A3
公开(公告)日：2005-08-31
申请号：EP04025039.1
申请日：2004-10-21
CPC分类号： H03F3/217 , H03F1/0227 , H03F1/0288 , H03F2200/331
摘要： A supply voltage and/or bias of a switching amplifier is modified based on at least one characteristic of the input signal relative to a threshold level. A binary waveform converter converts the input signal into a binary waveform for inputting into the switching amplifier. The switching amplifier amplifies the input signal, while the supply voltage and/or bias is modified in response to changes of the at least one characteristic of the input signal.
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公开(公告)号：EP1476949A1
公开(公告)日：2004-11-17
申请号：EP02712490.8
申请日：2002-02-04
申请人： Wavics Co., Ltd.
发明人： KWON, Youngwoo101-1103 Karak Dongbu Centreville , KIM, Junghyun403 Woowall Villa , BAE, Sung-Jun
IPC分类号： H04B1/04
CPC分类号： H03F1/0233 , H03F1/02 , H03F1/0205 , H03F1/0288 , H03F1/32 , H03F3/24 , H03F2200/102 , H03F2200/198 , H03F2200/423 , H03F2200/543 , H04B2001/045
摘要： The present invention relates to a power amplification circuit of a mobile device for improving the efficiency and the linearity properties of the power amplifier. In one embodiment, the power amplifier improves these properties by controlling the input voltage of the supplemental amplifier so that the power amplifier operates as the Doherty mode in the low output power mode depending on the magnitude of the output power from the output unit and so that the input voltage of the supplemental amplifier may be increased up to satisfy the non-linear operational requirements of a power amplifier in the high output power mode. Moreover, because only the input voltage of the supplemental amplifier is controlled, the power amplifier can be implemented in a simple manner. Thus, the size of the power amplifier becomes small, which in turn reduces the cost of the power amplifier, among other things.
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公开(公告)号：EP1470635A1
公开(公告)日：2004-10-27
申请号：EP02792144.4
申请日：2002-12-13
发明人： HELLBERG, Richard
CPC分类号： H03F3/24 , H03F1/0205 , H03F1/0288 , H03F1/0294 , H03F1/32 , H03F2200/423 , H03F2200/451
摘要： A composite power amplifier includes a first and a second power amplifier (16, 18) connected to an input signal over an input network and to a load over an output network (21). The output network includes phase shifting elements for generating different phase shifts from each power amplifier output to the common load. The input network includes means for driving both power amplifiers to produce (1) first output current components having an amplitude that increases linearly with increasing output signal amplitude below a transition point (T.P) and decreases motonically with increasing output signal amplitude above said point, and (2) second output current components having an amplitude that increases linearly with increasing output signal amplitude both below and above the transition point.
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94.发明公开Application of the doherty amplifier as a predistortion circuit for linearizing microwave amplifiers 审中-公开多赫蒂放大器作为预失真对于微波放大器
公开(公告)号：EP1271765A3
公开(公告)日：2004-06-16
申请号：EP02012744.5
申请日：2002-06-07
发明人： Kobayashi, Kevin W.
CPC分类号： H03F1/3241 , H03F1/0288
摘要： A predistortion circuit for a microwave amplifier and more particularly to predistortion circuit configured as a Doherty amplifier. The predistortion circuit is adapted to be coupled to a downstream Doherty amplifier to precompensate for the gain compression and phase expansion of the downstream Doherty amplifier as the input power level is increased while simultaneously reducing the intermodulation (IM) distortion. In order to provide precompensation, the precompensation circuit is operated at bias level to provide gain expansion and phase compression to cancel out the gain compression and phase expansion of the downstream Doherty amplifier to provide a higher overall linear power added efficiency (PAE).
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公开(公告)号：EP0941575B1
公开(公告)日：2004-03-03
申请号：EP97951531.9
申请日：1997-12-05
IPC分类号： H03G3/30
CPC分类号： H03F3/211 , H03F1/0277 , H03F1/0288 , H03F3/24 , H03F3/602 , H03F3/72 , H03F2200/294 , H03F2203/7236 , H03G3/3042 , H04B1/0483 , H04B2001/0408
摘要： An amplifier circuit (40) for providing an amplified signal in response to an input signal. The amplifier circuit (40) includes an input network (44) for applying the input signal to a selected at least one of a plurality of amplifier stages. An output network (48) is provided for coupling the amplified signal from the selected at least one amplifier stage. The appropriate amplifier stage is selected by a control circuit (56) in response to a desired power value of the amplified signal. By selectively activating only the amplifier stage(s) that is/are necessary to provide the desired level of output power, increased DC efficiency can be accomplished in applications that require an amplifier which operates linearly over a wide dynamic range.
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公开(公告)号：EP1312158A1
公开(公告)日：2003-05-21
申请号：EP01944023.9
申请日：2001-06-19
发明人： HELLBERG, Richard
CPC分类号： H03F3/24 , H03F1/0288 , H03F2200/168 , H03F2200/451
摘要： A composite amplifier includes a main power amplifier (10) and an auxiliary power amplifier (12), which are connected to a load (14) over a Doherty output network (16). Filters (26, 28) are provided for pre-filtering the amplifier input signals in such a way that the signals meeting at the output of the main amplifier have essentially the same frequency dependence.
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公开(公告)号：EP1265353A2
公开(公告)日：2002-12-11
申请号：EP02012746.0
申请日：2002-06-07
申请人： TRW Inc.
发明人： Kobayashi, Kevin W.
IPC分类号： H03F1/02
CPC分类号： H03F3/60 , H03F1/0288 , H03F1/306 , H03F3/1935 , H03F2200/192 , H03F2200/294 , H03F2200/372
摘要： A microwave amplifier and more particularly to a microwave amplifier configured as a Doherty amplifier. The amplifier includes a carrier amplifier, a peak amplifier, a Lange coupler at the input of the amplifiers and quarter wave amplifier at the output of the amplifiers. In order to further increase the efficiency, the Doherty amplifier is formed from HEMT/HBT technology to take advantage of the low-noise performance of HEMTs and the high-linearity of HBTs to form a relatively efficient amplifier that functions as a low-noise amplifier at low power levels and automatically switches to high-power amplification for relatively high-impact RF power levels.
摘要翻译： 微波放大器，更具体地涉及被配置为Doherty放大器的微波放大器。 放大器包括载波放大器，峰值放大器，放大器输入端的兰格耦合器和放大器输出端的四分之一波长放大器。 为了进一步提高效率，Doherty放大器由HEMT / HBT技术形成，以利用HEMT的低噪声性能和HBT的高线性度，形成一个相对有效的放大器，用作低噪声放大器 在低功率水平，并自动切换到高功率放大，用于相对高冲击的RF功率电平。
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公开(公告)号：EP0932933A4
公开(公告)日：2002-10-16
申请号：EP97938340
申请日：1997-08-13
申请人： MOTOROLA INC
CPC分类号： H03F3/211 , H03F1/0288
摘要： A power amplifier (10) provides linear amplification of noise-like multi-carrier signals over a wide range of power levels. A power divider (40) divides an input signal for distribution in three amplifier networks (70, 72, 74) for selective amplification based upon input signal levels. Each amplifier network (70, 72, 74) is biased to respond when the efficiency of the previous stage diminishes. Successive staging of amplifier networks (70, 72, 74) broadens the efficiency bandwidth of power amplifier (10). A combiner (28) merges output signals from each successive amplifier networks to provide an improved efficiency output to a power amplifier (10) load.
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公开(公告)号：EP1068666A1
公开(公告)日：2001-01-17
申请号：EP99911417.6
申请日：1999-03-16
申请人： Ericsson, Inc.
CPC分类号： H03F1/0288 , H03F1/0294
摘要： Two amplifiers that are driven using outphasing modulation are coupled to one another so that the amplifiers affect each other's effective load line. The two amplifiers can maintain efficiency over a wider dynamic range than in a conventional amplifier. Amplifiers according to the invention amplify an AC input signal of varying amplitude and varying phase using a DC power supply. A converter converts the AC input signal into a first signal having constant amplitude and a first phase angle and into a second signal having constant amplitude and a second phase angle. The first amplifier amplifies the first signal, and the second amplifier amplifies the second signal. A coupler couples the first and second amplifiers to one another and to a load impedance, such that voltages or currents in the first amplifier become linearly related to voltages or currents in the second amplifier. The coupler may include at least one transformer that serially couples the first and second amplifiers to one another and to the load impedance. The coupler may also include first and second quarter wave transmission lines that couple the first and second amplifiers to one another and to the load impedance. The amplifiers preferably use bilateral devices, such that current flows from the first and second amplifiers to the DC power supply during a part of a signal cycle, and thereby returns energy to the DC power supply. Each of the more than two signals of constant amplitude and controlled phase is then separately amplified in separate amplifiers. The separately amplified more than two signals of constant amplitude and controlled phase are then combined to produce an output signal that is an amplification of the input signal at the desired power level. When converting the input signal into more than two signals, the phase of each of the more than two signals of constant amplitude and controlled phase is controlled to produce the output signal that is an amplification of the input signal at the desired power level. According to another aspect, a signal of varying amplitude and varying phase is generated from a plurality of constant amplitude varying phase signals, the sum of which is the signal of varying amplitude and varying phase. An IQ waveform generator generates a cosine carrier modulation waveform I(t) and a sine carrier modulation waveform Q(t) from the signal of varying amplitude and varying phase. A function generator generates a complementary waveform Q'(t) from the cosine carrier modulation waveform I(t) such that the sum of squares of I(t) and Q'(t) is constant. A first modulator modulates a cosine carrier signal with I(t) to obtain a first modulated cosine carrier. A second modulator modulates a sine carrier signal with Q'(t) to obtain a first modulated sine carrier. A circuit such as a butterly circuit forms the sum and difference of the first modulated cosine carrier and the first modulated sine carrier to obtain the constant amplitude varying phase signals.
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100.发明公开Power amplifier, power control method for power amplifier, and communication equipment 审中-公开功率放大器，用于功率放大器和通信装置的功率控制方法
公开(公告)号：EP1032120A2
公开(公告)日：2000-08-30
申请号：EP00103893.4
申请日：2000-02-24
发明人： Ishida, Kaoru , Obara, Toshio , Kosugi, Hiroaki , Komatsu, Naoki
CPC分类号： H03F1/0277 , H03F1/0288 , H03F3/72 , H03F2203/7239
摘要： A power amplifier has an input terminal; an output terminal; an N number of bypassable amplification circuits which are connected directly or indirectly in a sequential manner between the input terminal and the output terminal; an impedance conversion circuit which is connected directly or indirectly between the amplification circuit of a final stage and the output terminal; and a bias control circuit which controls the amplification circuits,
each of the amplification circuits is configured by a high-frequency switch circuit, and an amplifier which is connected directly or indirectly to the switch circuit, and
the bias control circuit controls power source voltages of the amplifiers and controls status of the switch circuit.
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