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Journals and Conferences
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… (More)
In this paper a new planar balun for UWB- applications has been developed using a two-stage Wilkinson divider for power splitting followed by two coupled line sections for plusmn90 phase shifting. Patterned ground shielding (PGS) is used to increase the even-mode and decrease the odd mode impedances. The compact balun structure covers an area of less than 5… (More)
This paper presents a single chip receiver front-end, including low-noise amplifier and mixer, for application in automotive radar systems at 77 GHz. The circuit has been implemented in a SiGe HBT technology. The complete circuit occupies 1030 times 1130 mum<sup>2</sup> including bond pads and dissipates 440 mW from a 5.5 V supply. The front-end shows a… (More)
A direct-conversion micromixer realized in a modern SiGe:C bipolar technology for application in automotive radar systems at 77 GHz is presented. The mixer exhibits a minimum conversion gain of 15 dB and a maximum noise figure of 16.5 dB over a frequency range from 75 GHz to 85 GHz. The 1dB input related compression point is at -3dBm and the RF and LO… (More)
A fully-automated measurement system for 77-GHz mixers is presented. Power and frequency of LO signal plus up to three RF signals can accurately be configured. The RF signals are combined before being applied to the device under test (DUT) making single and dual tone measurements possible combined with the emulation of a blocking signal as important for… (More)
A branch-line, rat-race and a reduced-size branch-line coupler have been realized in a modern SiGe:C bipolar technology for application in automotive radar systems at 77 GHz. The paper describes the design methodology of passive circuits on lossy Si-based substrate up to 110 GHz and gives measurement results of the manufactured circuits.
An advanced behavioral model of a 77 GHz SiGe Gilbert-type double balanced mixer is proposed, which is able to accurately model conversion gain compression and noise figure compression due to LO-power drop. The model is for use in system simulation of direct conversion automotive FMCW-radar transceivers. Model parameters can be easily extracted from 77 GHz… (More)
A nonlinear RFID frontend behavioral model has been developed. By using this model the simulation time for inlay optimizations can be decreased considerably and the models hide the IC manufacturer's intellectual properties. The inherent model order reduction is based on nonlinear state-space mapping using derivative coordinates and harmonic-balance… (More)
This paper presents a direct-conversion mixer for 77 GHz integrated with an active 4times LO frequency multiplier. The circuit was manufactured using a SiGe technology. Noise figure, conversion gain, linearity and s-parameter measurement results will be shown.
We have constructed a FPGA-based ldquoearly neural circuit simulatorrdquo to model the first two stages of stimulus encoding and processing in the rat whisker system. Rats use tactile input from their whiskers to extract object features such as size and shape. We use the simulator to examine the plausibility of the hypothesis that neural circuits in the… (More)