2007
DOI: 10.1109/isscc.2007.373545
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A Fully Integrated RF Front-End with Independent RX/TX Matching and +20dBm Output Power for WLAN Applications

Abstract: The rapid growth of the wireless local area network (WLAN) market has necessitated new circuit techniques that integrate highpower power amplifiers (PAs), high-sensitivity low-noise amplifiers (LNAs), and RF transmit/receive (T/R) switch components onto a monolithic CMOS IC to alleviate the cost of external discrete components between the system-on-chip (SoC) and the antenna. The popularity of multiple-input multiple-output (MIMO) technologies has further hastened the appeal of these approaches because any ext… Show more

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Cited by 21 publications
(17 citation statements)
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“…Due to the high linearity requirements of OFDM modulation, the PA was biased in class-A which leads to large bias currents and low PAE [6]. Additionally, simulations indicate that there is design space for load impedance improvement to get a higher output power.…”
Section: Off-chip Matching Networkmentioning
confidence: 99%
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“…Due to the high linearity requirements of OFDM modulation, the PA was biased in class-A which leads to large bias currents and low PAE [6]. Additionally, simulations indicate that there is design space for load impedance improvement to get a higher output power.…”
Section: Off-chip Matching Networkmentioning
confidence: 99%
“…The transformer-based PA in this work has similar average output power compared to recently presented WLAN PAs. However, our PA is capable of running at a lower supply voltage than [6], maintaining a low EVM for a 802.11n OFDM signal with more subcarriers than 802.11 g [5,6], and is implemented in a more advanced technology with increased resistances in the interconnects [2].…”
Section: Off-chip Matching Networkmentioning
confidence: 99%
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“…Although the efficiency is much higher compared to a class A linear amplifier (3.81% in [22]), it is lower than expected. Measurements show that the stand-alone class E amplifier efficiency is only 21.7% for the OFDM signal due to excessive bond-wire inductance at the outputs of the differential class-E amplifiers.…”
Section: Measurement Resultsmentioning
confidence: 54%
“…Unfortunately, the class-E PA is not well-suited for outphasing system because of varying load impedance with lossless power combining [21], [22]. The zero voltage switching characteristic is only valid for the fixed load.…”
Section: Disadvantagesmentioning
confidence: 99%