A Low-Noise Current-Squared Delta-Sigma-Modulation Boost Converter Suitable for Low-Voltage Wireless Sensor Networks With Transient-Accelerated Techniques

Abstract

This paper presents a low-noise current-squared delta-sigma-modulation boost converter suitable for low-voltage wireless sensor networks with transient-accelerated techniques. There are two current-controlled loops and two voltage-controlled loops in the proposed converter to achieve low noise, fast-transient-response times, and low-transient voltages. The converter’s transient-accelerated circuit consists of a current sensing circuit and a dynamic slope compensation circuit, which significantly improves the transient response. Additionally, the converter has low output noise and a fast-transient recovery time, and exhibits good undershoot and overshoot voltage control ability when the load current changes. Experimental results indicate that the boost converter is fabricated using the TSMC T18HVG2 1P6M CMOS process with a chip area of 1.26 mm $\times 1.18$ mm. The sampling frequency of 10 MHz, and the output-to-noise ratio (ONR) is 70.4dB. Furthermore, the converter achieves a peak power efficiency of 88 %, with optimal performance achieved at a load current of 70 mA and an output voltage of 1.8 V.

Keywords

• Fast-transient
• second-order delta-sigma modulation
• dual-current-acceleration technique
• pseudo-DCR current-sensor
• Buck converter