A 200/spl deg/C automatic gain controlled oscillator for MEMS resonator with an MRC transimpedance

A MEMS (micro electro-mechanical system) resonator oscillator is presented in this paper. It is based on a transimpedance amplifier (current to voltage converter) with a voltage controllable gain. The complete architecture of the oscillator is designed to control the oscillation amplitudes. The novelty of this paper is the use of an MRC (MOS resistive circuit) as active element to control the gain. The differential structure of the MRC is suitable for a high temperature environment (200/spl deg/C). Each of the cells of the oscillator have been designed and simulated at transistor level in a standard 0.6 /spl mu/m CMOS technology. The global electronic system simulation has been driven for a large temperature range.