Georg Böck

Double balanced resistive mixer for mobile applications

We present a double balanced resistive mixer for mobile applications using a 0.35 /spl mu/m MOSFET technology. The mixer has been designed for direct conversion receivers, with RF- and IF-frequency ranges of 2-3 GHz and DC to 50 MHz, respectively. Excellent performance has been achieved. Typical values are 6 dB conversion loss, 6.5 dB noise figure, 7 dBm 1 dB power compression, 16 dBm third order intercept point, and 50 dB isolation between all ports. The mixer does not consume DC-power and the needed LO-voltage amplitude is 1 V typical. No low frequency noise was detectable down to 10 kHz. We report on the design strategy and present simulated and measured results.

Ultra broadband transmission line transformers - planar realization principles

Three Guanella-type transmission line transformers (TLT) are presented: a coiled TLT on a GaAs substrate, a straight ferriteless TLT on a multilayer PCB and a straight hybrid TLT that employs semi-rigid coaxial cables and a ferrite. All three devices have 4:1 impedance transformation ratio, matching 12.5 /spl Omega/ to 50 /spl Omega/. Extremely broadband operation is achieved. A detailed description of the devices and their operational principle is given. General aspects of the design of TLT are discussed.

RF-CMOS Integrated Circuits for Wireless Communications

This paper reviews state of the art CMOS-RFICs for wireless transceivers. It discusses principles and trends in the development of wireless platforms in the context of CMOS technology evolution. Some examples of achievements and commercial implementations are presented. Finally, some perspectives on future directions in RF-CMOS integration will be given.

Design of a 60 GHz transceiver module with integrated antenna

This paper describes the design of an integrated frontend module, suited for reliable 60 GHz transmission. The module makes use of a recent SiGe chip set presented and it is based on a commercial available high volume printed circuit board technology. In the following we focus on the frontend architecture, the on-board antenna and the transitions between board and chips.