Renesas Electronics, Hitachi develops high precision automotive A/D Converter Circuit

New Circuit Development that was Introduced at ISSCC Enables Continuous-Time Digital Calibration of Delta-Sigma A/D Converter with World’s First Multi-Rate LMS Algorithm

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Renesas ElectronicsRenesas Electronics and Hitachi announced a technology collaboration to enable continuous-time digital calibration of a delta-sigma (ΔΣ) modulator and an analog-to-digital (A/D) converter circuit.

It is designed to boost the performance of ΔΣ A/D converters for stable performance under the harsh conditions required for automotive semiconductor devices.

The new technology from Renesas Electronics comprises enhanced precision by using a least mean square (LMS) algorithm to measure and calibrate the transfer function of a continuous-time ΔΣ modulator, and the world’s first multi-rate LMS search algorithm, which reduces the order and operating frequency of the coefficient search circuit and FIR digital filter to reduce power consumption.

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