Title :
On the design and performance of a balanced-cascade LNA for FDD-WCDMA direct-conversion node-B RF receiver
Author_Institution :
Centre for Dev. of Telematics, Bangalore, India
Abstract :
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.
Keywords :
3G mobile communication; HEMT integrated circuits; UHF amplifiers; cascade networks; differential amplifiers; frequency division multiplexing; impedance matching; intermodulation distortion; radio receivers; 55 dB; 6400 micron; 800 micron; E-pHEMT type; FDD-WCDMA; IMD3; amplitude phase balance; balanced-cascade LNA; base station receiver; direct-conversion RF receiver; distributed type quadrature hybrid; input matching; linearity; low noise amplifier; node-B RF receiver; performance; third order intermodulation; ultra-low noise figure; wideband code division multiple access; Base stations; Broadband amplifiers; Gain; Linearity; Low-noise amplifiers; Multiaccess communication; Noise figure; Noise measurement; Radio frequency; Radiofrequency amplifiers;
Conference_Titel :
Personal Wireless Communications, 2005. ICPWC 2005. 2005 IEEE International Conference on
Print_ISBN :
0-7803-8964-6
DOI :
10.1109/ICPWC.2005.1431362
