2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157)
DOI: 10.1109/mwsym.2001.967189
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High-efficiency high-level modulator for use in dynamic envelope tracking CDMA RF power amplifiers

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Cited by 36 publications
(18 citation statements)
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“…The high efficiency envelope amplifier is usually realized by a DC/DC converter, and the switching frequency is required to be several times the signal bandwidth [16]. For narrow bandwidth applications, most high efficiency switching mode DC/DC converters are realized by traditional delta modulation [17] or pulse width modulation (PWM) [18] modulators. On the other hand, the high switching frequency will bring in a considerable switching loss for a wideband signal.…”
Section: Envelope Elimination and Restorationmentioning
confidence: 99%
“…The high efficiency envelope amplifier is usually realized by a DC/DC converter, and the switching frequency is required to be several times the signal bandwidth [16]. For narrow bandwidth applications, most high efficiency switching mode DC/DC converters are realized by traditional delta modulation [17] or pulse width modulation (PWM) [18] modulators. On the other hand, the high switching frequency will bring in a considerable switching loss for a wideband signal.…”
Section: Envelope Elimination and Restorationmentioning
confidence: 99%
“…For narrowbandwidth applications, most high-efficiency switching mode dc/dc converters for power amplifier applications are realized by traditional delta-sigma [27] or pulsewidth modulation (PWM) [28] modulators. However, the high switching frequency introduces a significant switching loss for a wideband signal.…”
Section: Dynamic Power Supply Variation Using Envelope Tracking/envelmentioning
confidence: 99%
“…It should also have high efficiency and high output power capability. Several converter topologies have been proposed in this context: Høyerby and Andersen [4] proposed a synchronous buck converter with a fourth-pole output filter, two feedback loops and a hysteretic controller that achieved 50 kHz tracking bandwidth and was able to provide a peak power above 400 W. Anderson and Cantrell [5] proposed a single-ended primary inductor converter (SEPIC) that achieved 1.25 MHz bandwidth and delivered nearly 125 W to a load with 80% efficiency. Yousefzadeh et al [6] presented a three-level buck converter that achieved advantages in terms of output voltage ripple and efficiency.…”
mentioning
confidence: 99%