Low phase noise, FBAR-based voltage controlled oscillator without varactor

A Colpitts voltage controlled oscillator (VCO) at 1.1 GHz is designed with a film bulk acoustic resonator (FBAR) as the frequency control element. The oscillator achieves an extremely low phase noise of -115 dBc/Hz at 10 kHz offset, which is 19 dB better than that of an LC oscillator. Voltage control of the oscillation frequency is obtained by applying a DC voltage on the FBAR, unlike a conventional VCO that uses a PN junction varactor (a significant noise contributor) to vary the oscillation frequency. The frequency tunability of the VCO is approximately -12 kHz/V between -5 V and +10 V.

[1]  A. Khanna,et al.  A 2GHz voltage tunable FBAR oscillator , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[2]  Brian Otis,et al.  A 300µmW 1.9GHz CMOS oscillator utilizing micromachined resonators , 2002, Proceedings of the 28th European Solid-State Circuits Conference.

[3]  P. Bradley,et al.  A film bulk acoustic resonator (FBAR) duplexer for USPCS handset applications , 2001, 2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157).

[4]  Ali Hajimiri,et al.  A noise-shifting differential Colpitts VCO , 2002, IEEE J. Solid State Circuits.

[5]  Willy Sansen,et al.  Analog circuit design : RF analog-to-digital converters; sensor and actuator interfaces; low-noise oscillators, PLLs and synthesizers , 1997 .

[6]  J. Rabaey,et al.  A 300-μW 1.9-GHz CMOS oscillator utilizing micromachined resonators , 2003, IEEE J. Solid State Circuits.

[7]  R. Aigner,et al.  High performance RF-filters suitable for above IC integration: film bulk-acoustic- resonators (FBAR) on silicon , 2003, Proceedings of the IEEE 2003 Custom Integrated Circuits Conference, 2003..

[8]  T.H. Lee,et al.  Oscillator phase noise: a tutorial , 1999, IEEE Journal of Solid-State Circuits.

[9]  J. Gavan,et al.  Nonlinear radio mutual interference main effect analysis and mitigation methods , 1998, 1998 IEEE EMC Symposium. International Symposium on Electromagnetic Compatibility. Symposium Record (Cat. No.98CH36253).