A Fast-Transient Boost Converter With Noise-Reduction Techniques for Wireless Sensor Networks

This paper presents a fast-transient boost converter with noise-reduction techniques for wireless sensor networks. The modulator can be directly inputted by 0.8-1.2 V for 1.8 V output. The proposed low electromagnetic interference (EMI) boost converter is based on a fast delta-sigma controller. This paper proposes a fast delta-sigma modulator for a boost converter to solve the EMI problem. The proposed converter complies with Federal Communication Commission class B conducted emission limits, in which the harmonic level must be lower than -48 dBμV for frequency from 0.45 to 30 MHz. The measured results show that the maximum efficiency of the proposed converter is 90%, and the recovery time is 4 μs from heavy to light load and 8 μs from light to heavy load. The chip was fabricated in Taiwan Semiconductor Manufacturing Co., Ltd. 1P6M 0.18-μm complementary metal-oxide-semiconductor process, and the chip area is ~0.85 mm 2 . It is designed to operate from 1 to 2 MHz with a 3.3-μH inductor and a 10-μF output capacitor. The proposed converter output spectrum is lower than -70 dBm or -40 dBμV.