Title :
Fast and accurate ramp generation with a PLL-stabilized 24-GHz SiGe VCO for FMCW and FSCW applications
Author :
Stelzer, A. ; Ettinger, K. ; Hoftberger, J. ; Fenk, J. ; Weigel, R.
Author_Institution :
Johannes Kepler Univ., Linz, Austria
Abstract :
In Microwave sensor systems the application of linear frequency modulation schemes as well as frequency stepping is commonly used. In this paper we describe the generation of fast and highly accurate frequency ramps by means of a fractional-N-PLL stabilized integrated 24-GHz voltage controlled SiGe oscillator, which are a prerequisite for high achievable measurement accuracies. Linearity measurements with phase evaluation on fabricated devices have shown an RF-phase deviation of less than 1.5 rad for a linear frequency sweep with a bandwidth of 250 MHz at 24.5 GHz and a sweep duration of 250 /spl mu/s.
Keywords :
CW radar; FM radar; Ge-Si alloys; circuit stability; microwave detectors; microwave oscillators; phase locked loops; semiconductor materials; voltage-controlled oscillators; 24 GHz; 250 MHz; FMCW radar; FSCW radar; SiGe; SiGe voltage controlled oscillator; fractional-N-PLL stabilization; frequency ramp generation; frequency stepping; linear frequency modulation; linear frequency sweep; microwave sensor; Chirp modulation; Frequency measurement; Germanium silicon alloys; Linearity; Microwave oscillators; Microwave sensors; Power capacitors; Silicon germanium; Voltage control; Voltage-controlled oscillators;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1212513
