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Session: TU4D3:30 PM Tuesday, May 25, 2010 Room: 207AB |
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Session: TU4D | Novel Circuit and System Technologies for Wireless Communications |
Chair: | Kyutae Lim, Georgia Institute of Technology |
Co-Chair: | Shoichi Narahashi, NTT DOCOMO, INC. |
Abstract: | In this session, the disruptive technologies in circuit and system for wireless communication applications are presented. It will cover the topics including power amplifiers, wireless transmission, transmitter architecture and calibration of RF system imperfection. |
| | TU4D-1 | ISO-less, SAW-less Open-loop Polar Modulation Transceiver for 3G/GSM/EDGE Multi-mode/Multi-band Handset | 3:30 PM-3:50 PM | T. Tsukizawa1, M. Nakamura1, G. L. Do2, M. Igarashi3, K. Ishida1, 1Panasonic Corporation, Yokohama, Japan, 2Panasonic Corporation, San Jose, United States, 3Panasonic Corporation, Nagaokakyo, Japan |
(1188) | In this paper, a new 3G/GSM/EDGE multi-mode/multi-band transceiver that achieves both the elimination of TX-SAW filter and the isolator using an open-loop polar modulation transmitter is presented. Sufficient ACLR performance is accomplished by a combination of parts-to-parts calibration and temperature offset compensation. ACLR meets 3GPP target specification at VSWR=3:1, with Rx band noise at PA output in UMTS band I of –132.3dBm/Hz thus does not degrade receiver sensitivity. This paper includes design details and experimental results. | | |
TU4D-2 | A Highly Integrated Dual Band SiGe BiCMOS Power Amplifier that Simplifies Dual-band WLAN and MIMO Front-End Circuit Designs Chun-Wen Paul Huang, Mark Doherty, Philip Antognetti, Lui (Ray) Lam, and William Vaillancourt SiGe Semiconductor, Andover, MA 01810, USA | 3:50 PM-4:10 PM | C. P. Huang, M. Doherty, P. Antognetti, L. Lam, W. Vaillancourt , SiGe Semiconductor, Andover, United States |
(1749) | A highly integrated SiGe BiCMOS power amplifier for dual-band WLAN applications is presented. The PA has 2 and 3 stages of amplification for the ‘b/g’ and ‘a’ band, respectively, and integrates the input/output matching network, out-of-band rejection filter, power detector, and bias control. The die area is 1.7 x 1.6 mm. The b/g amplifier achieves 28 dB gain with 19.5 dBm output power at 3% EVM and 185mA and harmonics of -45dBm/Mhz. The a-band amplifier achieves 30 dB gain with 3% EVM at 19.0 dBm output with 220mA of current and harmonics -50 dBm/MHz. The reported PA linearity, out-of-band rejection, and integration level exceeds previously reported WLAN dual-band SiGe PA designs. | | |
TU4D-3 | A Technique for Wireless LAN Connection through Building Concrete Wall at 2.4GHz. | 4:10 PM-4:30 PM | S. Mizushina, A. Adachi, Enegene Co. Ltd., Hamamatsu, Japan |
(1021) | A technique for wireless LAN connection through building concrete wall is proposed. The propagation loss in a 10cm-thick concrete is found about -8.9dB at 2.4GHz by simulation and experiment. Using a large aperture horn antenna placed on the back of wall, the attenuated signal power is raked over a wide area and reradiated into a space behind the wall via a small second antenna connected to the first one in the downlink. It is possible to make the reradiated field in a limited region near the second antenna nearly as strong as that of the wave incident on wall. A small-power relay station based on the IEEE802.11g/b standards is placed in this region to complete the downlink. In the uplink, the signal power from repeater antenna is picked up by the second antenna and reradiated into the space ouside the wall. An amplifier of about 13dB gain is required to make the uplink versus downlink link budgets balanced. The proposed method is analyzed by 3D simulation and supported by experiment. | | |
TU4D-4 | Asymmetric multilevel outphasing transmitter using Class-E PAs with discrete pulse width modulation | 4:30 PM-4:50 PM | S. Chung, P. A. Godoy, T. W. Barton, J. L. Dawson, D. J. Perreault, Massachusetts Institute of Technology, Cambridge, United States |
(1636) | We present a high-efficiency wideband transmitter architecture based on asymmetric multilevel outphasing (AMO), but with a new method of generating discrete amplitude levels from the constituent amplifiers. AMO and multilevel LINC improve their efficiency over LINC by switching the supplies of the PAs among a discrete set of voltages. This allows them to minimize the occurrence of large outphasing angles. However, it is also possible to generate a discrete set of amplitudes by varying the duty cycle of the waveform that drives the PAs. The chief advantage of this discrete PWM (DPWM) is hardware simplicity, as it eliminates the need for a fast, low-loss switching network and a selection of power supply voltages. We demonstrate a 48-MHz, 20-W peak output power AMO transmitter using a 4-level DPWM. At peak output power, the PAE is 77.7%. For a 16-QAM signal with a 6.5-dB PAPR, the prototype improves the average efficiency from 17.1% to 36.5% compared to the standard LINC. | | |
TU4D-5 | Experimental Performance Evaluation of IQ Imbalance and DC Offset Estimation and Compensation Technique for 3GPP LTE Base Station | 4:50 PM-5:10 PM | A. Yamaoka, K. Yamaguchi, T. Kato, Y. Tanabe, TOSHIBA Corporation, Kawasaki, Japan |
(1179) | In the case of recent wireless communication systems, the need to achieve high performance means that impairments in analog circuits cannot be disregarded. Digital predistorter (DPD), which can eliminate nonlinear distortion, is one of the compensation techniques. However, in the case that direct conversion architecture is used in both a forward path and a loop-back path, errors in a quadrature modulator (QMOD) and a quadrature demodulator (QDEMOD) affect the performance of DPD. Previously, we proposed an error estimation technique for a QMOD and a QDEMOD that uses a variable phase shifter and evaluated its performance by an experiment using a narrow-band signal. In this paper, we evaluate the performance of the error estimation technique using the signal based on the 3GPP Long Term Evolution, whose bandwidth is wider than that in the previous experiment The results show that image rejection ratio after compensation is -59dBc and error vector magnitude is -52dBc at the QMOD output. | | |
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