Abstract
This paper introduces a 900-MHz/1.8-GHz CMOS trans- mitter designed for dual-band applications. Configured as a two-step architecture, the circuit generates the first up- converted signal in quadrature phases and subsequently performs single-sideband modulation to produce the out- put in the two bands. Fabricated in a 0.6-,urn CMOS tech- nology, the transmitter draws 70 mW from a 3-V supply.

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