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A novel cross-coupled inter-poly-oxide capacitor for mixed-mode CMOS processes

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2 Author(s)
Ming-Jer Chen ; Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Chin-Shan Hou

The inter-poly-oxide (IPO) capacitor is one of the main elements in present mixed-mode CMOS process technologies. However, the phenomenon of poly depletion causes a significant change in the measured capacitance with applied voltage. This effect, expressed in terms of the voltage coefficient of capacitance (VCC), can seriously deteriorate analog precision. A novel cross-coupled scheme is proposed for the IPO capacitors. The resulting VCC has a very low measured value of 2 ppm/V in a 0.35-μm standard mixed-mode CMOS process, achieved without any unconventional approaches.

Published in:

Electron Device Letters, IEEE  (Volume:20 ,  Issue: 7 )