Weekly meeting 1 An Efficient Piezoelectric Energy Harvesting Interface Circuit Using a Bias-Flip Rectifier and Shared Inductor (JSSC’10) 1 Part 1: Key idea Full-bridge rectifier & Voltage doubler Harvester 一个周期提供： 2 Part 1: Key idea Switch-only rectifier VS Bias-flip rectifier 12.33X improvement at perfect bias-flipping 3 Part 2: Circuit Implementation Overall architecture & Bias-flip rectifier 4 Part 2: Circuit Implementation Timing & Gate-overdrive control for Bias-flip rectifier 0 1 Assume: 𝑉𝑅𝐸𝐶𝑇 = 4𝑉, 𝑉𝐷 = 0.4𝑉 5-4.4=0.6V≈ 𝑉𝑇𝐻 5 Part 2: Circuit Implementation Delay block to control the on-time of bias-flip switches & Negative voltage generator Assume: 𝑉𝐷 = 0.7𝑉 𝑉𝐹𝐴𝑅_𝑃 & 𝑉𝐻𝐴𝑅_𝑁 may be -0.7V If P-sub=0V P-N junction diode in sub-N+ on! 6 Part 2: Circuit Implementation Buck converter 𝑉𝑅𝐸𝐶𝑇 ∶ 2.2𝑉 − 5𝑉 7 Part 2: Circuit Implementation Buck converter --- Pulse width control Zero-current switching 8 Part 2: Circuit Implementation Boost converter 9 Part 2: Circuit Implementation Arbiter for inductor sharing 功能： 10 Part 2: Circuit Implementation Arbiter gate-level implementation 11