Design Proposal for Inductor Type Buck Converter in Bluetooth Receiver Chip with Overshoot Cancellation and Ripple Reduction Technique

Abstract:

This paper presents a novel circuit design technique for an inductor type step-down buck converter in a blue-tooth receiver. Based on the superposition principle, a model of this system is proposed and verified by simulation. The overshoot phenomena is well controlled when R, L and C components are chosen by a relation |Z_L|=|Z_C|=2R based on a balanced charge and discharge time condition T=2π√LC=4πRC. Furthermore, a fundamental harmonic notch filter is recommended to keep small ripple which is designed at the fundamental harmonic frequency of PWM signal. A battery supply voltage of 3.6V was applied to the converter and the output voltage was set to 1.8V. The design of this methodology is given through the CMOS technology. As a result, a 1.8V stable step-down buck converter is designed for a blue-tooth low-IF receiver which the ripple is smaller than 0.2mVpp.

• Periodical: Advanced Engineering Forum (Volume 38)
• Pages: 179-191
• DOI: https://doi.org/10.4028/www.scientific.net/AEF.38.179
• Online since: November 2020
• Authors: Minh Tri Tran, Yi Fei Sun, Yasunori Kobori, Anna Kuwana, Haruo Kobayashi*
• Keywords: Balanced Charge-Discharge Time, Buck Converter, EMI Noise, Harmonic Notch Filter, Low-IF Receiver, Superposition Principle

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