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11.
Darabi H. Chiu J. Khorram S. Hea Joung Kim Zhimin Zhou Hung-Ming Chien Ibrahim B. Geronaga E. Tran L.H. Rofougaran A. 《Solid-State Circuits, IEEE Journal of》2005,40(3):698-706
A fully integrated dual-mode CMOS transceiver tuned to 2.4 GHz consumes 65 mA in receive mode and 78 mA in transmit mode from a 3-V supply. The radio includes all the receive and transmit building blocks, such as frequency synthesizer, voltage-controlled oscillator (VCO), and power amplifier, and is intended for use in 802.11b and Bluetooth applications. The Bluetooth receiver uses a low-IF architecture for higher level of integration and lower power consumption, while the 802.11b receiver is direct conversion. The receiver achieves a typical sensitivity of -88 dBm at 11 Mb/s for 802.11b, and -83 dBm for Bluetooth mode. The receiver minimum IIP3 is -8 dBm. Both transmitters use a direct-conversion architecture, and deliver a nominal output power of 0 dBm, with a power range of 20 dB in 2-dB steps. 相似文献
12.
Behzad A.R. Zhong Ming Shi Anand S.B. Li Lin Carter K.A. Kappes M.S. Tsung-Hsien Lin Nguyen T. Yuan D. Wu S. Wong Y.C. Victor Fong Rofougaran A. 《Solid-State Circuits, IEEE Journal of》2003,38(12):2209-2220
A fully integrated CMOS direct-conversion 5-GHz transceiver with automatic frequency control is implemented in a 0.18-/spl mu/m digital CMOS process and housed in an LPCC-48 package. This chip, along with a companion baseband chip, provides a complete 802.11a solution The transceiver consumes 150 mW in receive mode and 380 mW in transmit mode while transmitting +15-dBm output power. The receiver achieves a sensitivity of better than -93.7dBm and -73.9dBm for 6 Mb/s and 54 Mb/s, respectively (even using hard-decision decoding). The transceiver achieves a 4-dB receive noise figure and a +23-dBm transmitter saturated output power. The transmitter also achieves a transmit error vector magnitude of -33 dB. The IC occupies a total die area of 11.7 mm/sup 2/ and is packaged in a 48-pin LPCC package. The chip passes better than /spl plusmn/2.5-kV ESD performance. Various integrated self-contained or system-level calibration capabilities allow for high performance and high yield. 相似文献
13.
Shameli A. Safarian A. Rofougaran A. Rofougaran M. De Flaviis F. 《Microwave Theory and Techniques》2008,56(1):31-38
A two-point modulation technique is presented that improves the performance of nonlinear power amplifiers (PAs) in polar transmitters. In this scheme, the output amplitude modulation is performed by controlling the current of the PA. The current control technique enables the PA to provide wideband amplitude modulation, as well as high power control dynamic range. In addition, the supply voltage of the PA is adjusted based on the output power level. The voltage supply adjustment substantially improves the effective power efficiency of the PA. The voltage supply control is performed using a second-order sigma-delta dc-dc converter, which presents an efficiency of over 95% in its operational range. The PA operates at 900 MHz with maximum output power of 27.8 dBm and power efficiency of 34% at maximum output power. The proposed PA achieves 62-dB power control dynamic range with amplitude modulation bandwidth of over 17.1 MHz. The circuits are fabricated in a CMOS 0.18 mum process with a 3.3-V power supply. 相似文献