@article{TUW-106095, author = {Hackl, Sabine and B{\"o}ck, J. and Ritzberger, G{\"u}nter and Wurzer, M. and Scholtz, Arpad Ludwig}, title = {A 28GHz monolithic integrated quadrature oscillator in SiGe bipolar technology}, journal = {IEEE Journal of Solid-State Circuits}, year = {2003}, volume = {38}, number = {1}, pages = {135--137} }