Title :
Multi-Mode Wideband Voltage Controlled Oscillators
Author :
Rohde, Ulrich L. ; Poddar, Ajay K.
Author_Institution :
Univ.of Cottbus, Cottbus
Abstract :
Communication systems rely on stable VCO (voltage controlled oscillator) to maintain phase-locked conditions and ensure transmitted data integrity. Many third and later generation systems require multi-mode or multi-band signal sources (VCOs) to cover their bandwidth requirement. This paper presents the design of a dual-mode oscillator that simultaneously generates two signals at different frequencies. The novel approach is based on multi-mode frequency generation technique without recurring the switched inductors and varactors networks, and also support improved phase noise performance for a dual-mode operation over the band. The measured phase noise for mode #1 (450-900 MHz) and mode #2 (900-1800 MHz) are typically -120 dBc/Hz, and -112 dBc/Hz at 10 kHz offset from the carrier frequency respectively; and to our knowledge, this is the best phase noise performance for this class of VCO by using planar CMR (coupled microstripline resonator) so far reported.
Keywords :
UHF oscillators; coupled circuits; data integrity; microstrip resonators; microwave oscillators; phase locked oscillators; phase noise; voltage-controlled oscillators; VCO; coupled microstripline resonator; data integrity; dual-mode oscillator; frequency 450 MHz to 900 MHz; frequency 900 MHz to 1800 MHz; multiband signal sources; multimode frequency generation technique; multimode wideband voltage controlled oscillators; phase noise performance; phase-locked conditions; planar CMR; Bandwidth; Frequency measurement; Inductors; Noise measurement; Phase noise; Signal design; Signal generators; Varactors; Voltage-controlled oscillators; Wideband; CMR; Multi-Band; Multi-Mode; VCO;
Conference_Titel :
Electronics, Circuits and Systems, 2006. ICECS '06. 13th IEEE International Conference on
Conference_Location :
Nice
Print_ISBN :
1-4244-0395-2
Electronic_ISBN :
1-4244-0395-2
DOI :
10.1109/ICECS.2006.379750