Abstract
SUMMARY This letter presents a 900MHz ZigBee RF transmitterfront-end with on-chip LO suppression circuit at the output. To suppressthe LO leakage at the RF output, a novel LO suppression circuit is adoptedat the up-conversion mixer. The RF transmitter implemented in 0.18 µmCMOS shows more than 28dB of LO suppression over a wide range of thebaseband signal power variation. key words: CMOS transceiver front-end, IEEE 802.15.4, LO leakage sup-pression, low power transmitter 1. Introduction Recently, the direct conversion architecture has gained in-creasing attentions for the low power, low complexity andhigh integration single chip radio. However, the direct con-version architecture raises a number of issues such as LOleakage, I/Q mismatch and so on. In the transmitter, LOleakage could saturate the power amplifier and overlap withthe RF signal as well as being an inter-modulation noisesource for adjacent channels. This letter present a novelLO suppression scheme that has been applied to the up-conversion mixer.
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