Title :
A Fully Differential 77-GHz Active IQ Modulator in a Silicon-Germanium Technology
Author :
Wagner, Christoph ; Hartmann, Marcus ; Stelzer, Andreas ; Jaeger, Herbert
Author_Institution :
Lab. for Integrated Radar Sensors, Univ. of Linz, Linz
fDate :
5/1/2008 12:00:00 AM
Abstract :
A 77-GHz IQ modulator in a fully differential circuit configuration is presented. It includes an local oscillation (LO) buffer amplifier, a medium-power output stage, a double-balanced active mixer architecture and on-chip baluns for easy characterization. A differential branch-line coupler provides quadrature phase signals at the upconversion mixer LO inputs. The circuit is manufactured in a 200-GHz transit frequency technology, and the circuit performance is shown by on-wafer measurements.
Keywords :
Ge-Si alloys; active networks; baluns; buffer circuits; coupled circuits; differential amplifiers; millimetre wave amplifiers; millimetre wave mixers; modulators; active IQ modulator; differential branch-line coupler; double-balanced active mixer architecture; frequency 200 GHz; frequency 77 GHz; fully differential circuit; local oscillation buffer amplifier; on-chip baluns; on-wafer measurements; silicon-germanium technology; transit frequency technology; 77 GHz; Automotive radar; IQ modulator; beam-steering; leakage cancellation;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2008.922133
