A high gain-bandwidth product transimpedance amplifier for MEMS-based oscillators

A variable gain differential transimpedance amplifier (TIA) optimized for MEMS-based oscillator applications is presented. The TIA achieves a variable gain of 17 kOmega to 290 kOmega, i.e. a gain range of 25 dB. The 3-dB bandwidths corresponding to these gains are 256 MHz and 103 MHz, respectively. The suitability of the TIA for the targeted application is demonstrated by combining it with a MEMS resonator to create an oscillator at the frequency of 8.29 MHz, with a phase noise of -89 dBc/Hz at a 1 kHz offset frequency.

[1]  Carlo Samori,et al.  Spectrum folding and phase noise in LC tuned oscillators , 1998 .

[2]  C. Nguyen,et al.  1.51-GHz nanocrystalline diamond micromechanical disk resonator with material-mismatched isolating support , 2004, 17th IEEE International Conference on Micro Electro Mechanical Systems. Maastricht MEMS 2004 Technical Digest.

[3]  Mourad N. El-Gamal,et al.  A compact and programmable high-frequency oscillator based on a MEMS resonator , 2008, 2008 IEEE Custom Integrated Circuits Conference.

[4]  David A. Johns,et al.  Analog Integrated Circuit Design , 1996 .

[5]  P. Vincent,et al.  Integration of high-Q BAW resonators and filters above IC , 2005, ISSCC. 2005 IEEE International Digest of Technical Papers. Solid-State Circuits Conference, 2005..

[6]  Mourad N. El-Gamal,et al.  Modeling and simulation of micro electromechanical (MEM) beam resonator-based oscillators , 2008, 2008 IEEE International Symposium on Circuits and Systems.

[7]  Seungbae Lee,et al.  A 10-MHz Micromechanical Resonator Pierce Reference Oscillator for Communications , 2001 .

[8]  Qing Jiang,et al.  Characterization of the squeeze film damping effect on the quality factor of a microbeam resonator , 2004 .