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On the design and performance of a balanced-cascade LNA for FDD-WCDMA direct-conversion node-B RF receiver

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1 Author(s)
Patro, S.K. ; Centre for Dev. of Telematics, Bangalore, India

In this paper, the design requirements, design procedure, and performance of a low noise amplifier (LNA) used in wideband code division multiple access (WCDMA) base station receiver, is illustrated. The amplifier design is aimed for a direct-conversion architecture. It simultaneously achieves good input-match, ultra-low noise figure and high linearity in terms of low third order intermodulation (IMD3). The LNA achieves an overall gain of 55 dB, noise figure (NF) better than 0.7 dB, and IMD3 less than -67 dBc. Devices used are E-pHEMT type with gate widths of 800 μm and 6400 μm. A distributed type quadrature-hybrid is used for balanced configuration with good amplitude and phase balance.

Published in:

Personal Wireless Communications, 2005. ICPWC 2005. 2005 IEEE International Conference on

Date of Conference:

23-25 Jan. 2005

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