IEEE--A 900MHz/1.8GHz CMOS Transmitter for Dual-Band Applications

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A 900-MHz/1.8-GHz CMOS Transmitter for Dual-Band Applications

Behzad Razavi, Member, IEEE

Abstract—The design of a radio-frequency transmitter that
can operate in two bands while employing a minimal number
of external components entails many challenges at both the
architecture and the circuit levels. This paper describes the
design of a 900-MHz/1.8-GHz transmitter implemented in CMOS
technology for dual-band applications. Configured as a two-step
architecture, the circuit generates the first upconverted signal
in quadrature form and subsequently performs single-sideband
modulation to produce the output in two bands. Fabricated
in a 0.6-m digital CMOS technology, the transmitter exhibits
unwanted spurs 40 dB below the carrier while drawing 75 mW
from a 3-V supply.

Index Terms—Gaussian minimum shift keying (GMSK) modulators,
radio-frequency (RF) CMOS circuits, single-sideband
(SSB) mixers, wireless transceivers.

IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 34, NO. 5, MAY 1999

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