Title :
Magnetically-coupled tuneable inductor for wide-band variable frequency oscillators
Author :
Worapishet, Apisak ; Ninyawee, Suttipong
Author_Institution :
Microelectron. Res. Center, Mahanakorn Univ. of Technol., Bangkok, Thailand
Abstract :
An approach to achieving a widely tuneable LC resonator is presented based on the magnetically coupled inductance tuning. It is shown that such scheme exhibits an improved trade-off between the frequency tuning range and the Q-factor (after being made tunable) compared to the conventional capacitance tuning technique. Moreover, when employed as a resonator in variable frequency oscillator circuits, it helps minimise the phase noise generation mechanism caused by up-conversion of low-frequency flicker noise in the added active components. With the use of the coupled inductance approach, a simulated oscillator with 600 MHz tuning range extending from 1.4-2.0 GHz or equivalently over 30% frequency tuning has been demonstrated. The achievable phase noise over the entire oscillation band is better than -100 dBc/Hz at 1 MHz offset
Keywords :
BiCMOS analogue integrated circuits; Q-factor; UHF integrated circuits; UHF oscillators; equivalent circuits; flicker noise; inductors; integrated circuit noise; phase noise; tuning; variable-frequency oscillators; 0.8 micron; 1.4 to 2 GHz; Q-factor; inductance tuning; low-frequency flicker noise; magnetically-coupled tuneable inductor; phase noise; phase noise generation; wideband VFO circuit; wideband variable frequency oscillators; widely tuneable LC resonator; Circuit optimization; Coupling circuits; Frequency; Inductance; Inductors; Oscillators; Phase noise; Tunable circuits and devices; Tuning; Wideband;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.921361
