A 2.7-V Quasi-Microwave Si-Bipolar Quadrature Modulator without Tuning

Tsuneo TSUKAHARA  Tadao NAKAGAWA  Masahiro MURAGUCHI  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E80-A   No.2   pp.349-352
Publication Date: 1997/02/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Analog Circuit Techniques for System-on-Chip Integration)
Category: 
Keyword: 
Si bipolar,  quadrature modulator,  quasi-microwave,  digital mobile communication,  

Full Text: PDF>>
Buy this Article




Summary: 
A 2.7-V Si-bipolar quadrature modulator with a 90 phase shifter consisting of a frequency doubler and a master-slave flip-flop is described. The modulator operates over a wide bandwidth (0.95 to 1.88 GHz) without any tuning or adjustments. It is implemented using 20-GHz Si-bipolar technology and dissipates 97 mW at 2.7 V. An image ratio of less than -40 dBc is obtained between 1.1 and 1.8 GHz. Moreover, third-order harmonic products are less than -40 dBc and carrier leakage is less than -30 dBc.