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A 1.57mW 99dBΩ CMOS transimpedance amplifier for VHF micromechanical reference oscillators

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5 Author(s)
Ming-Huang Li ; Institute of NanoEngineering and MicroSystems, National Tsing Hua University, Hsinchu, Taiwan ; Cheng-Syun Li ; Li-Jen Hou ; Yu-Chia Liu
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This work investigates a low-power transimpedance amplifier (TIA) topology suited for VHF micromechanical oscillator applications. The TIA circuit comprises of a regulated-cascode (RGC) transimpedance gain stage and an inverter-based wideband Cherry-Hooper amplifier with capacitive peaking. The circuit was designed using TSMC 0.18μm CMOS technology, exhibiting mid-band gain of 99dBμ and 3dB bandwidth of 280MHz while dissipating only 1.57mW from a 1.5V supply. A linear RLC equivalent model extracted from a practical 48MHz Lamé-mode resonator with Q>;40,000 was interfaced with the TIA circuit in a series-resonant oscillator configuration, showing simulated phase-noise less than -128dBc/Hz at 1kHz offset.

Published in:

2012 IEEE International Symposium on Circuits and Systems

Date of Conference:

20-23 May 2012