论文信息 - A wideband monolithic RMS-DC converter using micromachined diaphragm structures

A wideband monolithic RMS-DC converter using micromachined diaphragm structures

This paper reports a monolithic rms-dc converter for measuring wideband rms signals. Two identical thermoelements for thermal rms-dc conversion are formed using planar diaphragm structures and micromachined dielectric windows. Each thermoelement consists of two polysilicon heaters and a thin-film temperature sensor located on a window and operated at constant temperature using on-chip control feedback circuitry. The thermoelements achieve a thermal efficiency greater than 7/spl deg/C/mW with a thermal time constant less than 5 ms. The on-chip control circuitry is realized using a standard 3 /spl mu/m p-well CMOS process with minor modifications for process compatibility with the dielectric window formation. This converter measures rms signals over a full scale range of 1 Vrms, handles crest factors in excess of 5, exhibits a typical nonlinearity of less than 1%, and achieves a 3 dB bandwidth greater than 20 MHz. >

Kensall D. Wise | Euisik Yoon

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