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42% high-efficiency two-stage HBT power-amplifier MMIC for W-CDMA cellular phone systems

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6 Author(s)
Iwai, T. ; Fujitsu Labs. Ltd., Atsugi, Japan ; Kebayashi, K. ; Nakasha, Y. ; Miyashita, T.
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This is the first paper to report on a high-efficiency two-stage heterojunction-bipolar-transistor power-amplifier monolithic microwave integrated circuit (MMIC) for 1.95-GHz wide-band code-division multiple-access (W-CDMA) cellular phone systems. Power amplifiers for W-CDMA systems are required to operate at high efficiency and high linearity over a wide range of output power levels. To obtain high efficiency at low output power (Pout) as well as at the required maximum Pout and obtain a high linearity at the maximum Pout, we chose near-class-B operation. To improve linearity at a medium Pout range, we suppressed the gain distortion resulting from near-class-B operation by using an adaptive biasing technique. The MMIC exhibited a power-added efficiency of 42%, the highest ever reported, a gain of 30.5 dB, and an adjacent channel leakage power ratio at a 5-MHz offset frequency of -38 dBc at a Pout of 27 dBm under a supply voltage of 3.5 V with 3.84-Mcps hybrid phase-shift keying modulation

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:48 ,  Issue: 12 )