A 270-MHz CMOS Quadrature Modulator for a GSM Transmitter

Taizo YAMAWAKI  Satoshi TANAKA  Hiroshi HAGISAWA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E83-A   No.2   pp.272-273
Publication Date: 2000/02/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Analog Circuit Techniques and Related Topics)
CMOS GSM transmitter QMOD,  

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This paper describes a 270-MHz CMOS quadrature modulator (QMOD) for a global system for mobile communications (GSM) transmitter. QMOD consists of two attenuators and two doubly-balanced modulators (DBM's) and fabricated by using 0.35-µm CMOS process. The carrier leakage level of -35.7 dBc and the image rejection level of -45.1 dBc are achieved. It's total chip area is 880 µm550 µm and it consumes 1.0 mA with 3.0 V power supply.