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A single-chip 2.4 GHz direct-conversion CMOS receiver for wireless local loop using one-third frequency local oscillator

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7 Author(s)
Kyeongho Lee ; Global Commun. Technol. Inc., Los Altos, CA, USA ; Joonbae Park ; Jeong-Woo Lee ; Seung-Wook Lee
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A single-chip direct-conversion CMOS receiver for 2.4 GHz wide-band CDMA for wireless local loop (WLL) is described. The chip includes an LNA, a 12-phase down converter, a variable gain amplifier, a gm-C channel selection filter, a programmable PLL for 7 channel frequencies, and a 4-bit flash ADC. The proposed 12-phase down conversion scheme combined with a multi-phase sampling fractional-N prescaler, a cascaded DC-offset canceler and distributed AGC loops offers solutions to the problems of a direct conversion receiver. Experimental results show -115 dBm, sensitivity, 4.4 dB noise figure, and 95 dB dynamic range.

Published in:

VLSI Circuits, 2000. Digest of Technical Papers. 2000 Symposium on

Date of Conference:

15-17 June 2000