[C-12] Integrated Circuit and Devices

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[C-12-02] Digital Trimming of Clock Generator for Third-order CIFF Delta-Sigma Modulator for isolated ADC

〇Jun Tomisawa¹, Shota Morisaki¹ (1. Mitsubishi Electric Corp.)

Keywords:

Delta Sigma Modulator,ADC,Digital trimming,Automatic measurement,CIFF

Isolated ADC needs for integration into power modules to output current and temperature information as isolated digital signals. As a building block for the isolated ADC, a third-order CIFF ΔΣ modulator has been prototyped in X-FAB’s 0.35-μm process (XA035). An automatic measurement system was developed for the fabricated chip, and measurements were performed using a digital trimming clock generator. With the digital trim enabled, the measured chip achieved a maximum SNR of 96.9 dB, confirming an improvement over the untrimmed case.