A 900 MHz RF Transmitter with Output LO Suppression

Viet-Hoang LE  Trung-Kien NGUYEN  Seok-Kyun HAN  Sang-Gug LEE  

IEICE TRANSACTIONS on Electronics   Vol.E90-C    No.1    pp.201-203
Publication Date: 2007/01/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.1.201
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
CMOS transceiver front-end,  IEEE 802.15.4,  LO leakage suppression,  low power transmitter,  

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This letter presents a 900 MHz ZigBee RF transmitter front-end with on-chip LO suppression circuit at the output. To suppress the LO leakage at the RF output, a novel LO suppression circuit is adopted at the up-conversion mixer. The RF transmitter implemented in 0.18 µm CMOS shows more than 28 dB of LO suppression over a wide range of the baseband signal power variation.