Title :
DC-Offset Compensation Concept for Monostatic FMCW Radar Transceivers
Author :
Jahn, Martin ; Wagner, Christoph ; Stelzer, Andres
Author_Institution :
Inst. for Commun. Eng. & RF-Syst., Univ. of Linz, Linz, Austria
Abstract :
A novel dc-offset compensation technique for monostatic frequency-modulated continuous-wave (FMCW) transceivers is presented. This approach uses the intermediate frequency (IF) port of the active direct-conversion mixer to access its collector resistors. Additional external variable resistors in parallel connection can vary the total load resistance in each branch and hence compensate or generate a dc-offset voltage at the output. Since the wiring is located on the low-frequency side of the mixer, the variable resistors can also be external (off-chip), which offers great flexibility and eases application. The concept was successfully tested with an integrated 77 GHz automotive radar mixer fabricated in a 200 GHz fT Silicon Germanium (SiGe) bipolar technology.
Keywords :
CW radar; FM radar; millimetre wave circuits; mixers (circuits); road vehicle radar; transceivers; DC-offset compensation concept; active direct-conversion mixer; frequency-modulated continuous-wave transceivers; integrated automotive radar mixer; intermediate frequency port; monostatic FMCW radar transceivers; variable resistors; Automotive engineering; Frequency; Gain; Germanium silicon alloys; Mixers; Noise; Radar; Resistors; Silicon germanium; Testing; Transceivers; Transistors; Voltage; Wiring; DC-offset compensation; SiGe technology; frequency-modulated continuous-wave (FMCW) radar; millimeter wave circuits; zero-intermediate frequency (IF);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2010.2056359
