A 0.15-V, 44.73% PCE charge pump with CMOS differential ring-VCO for energy harvesting systems
Document Type
Article
Publication Date
4-1-2022
Abstract
This paper proposes a dynamic voltage frequency scaling technique (DVFS) for a CMOS differential bootstrapped ring-voltage controlled oscillator (DBRO), implemented in a 3-stage cross-coupled charge pump (CC-CP), for energy harvesting (EH) applications. A circuit applying this technique known as split input-supply, fabricated in the 130-nm CMOS, compares a signal with an input range of 0.15-0.5 V along with a load of 100 k-1 M omega with an incremental step of 100 k and 2 M omega, respectively. The technique allows the DVFS-DBRO to operate with optimum frequency and lower power consumption, which improves the power conversion efficiency (PCE) as well as establishes a wide energy harvesting range. The circuit observes a 44.73% of PCE with 0.15 V input voltage when driving a 2 M omega load. DVFS also offers a twofold clock boosting of the input voltage without the voltage scaling effect, which improves the charge-pump conduction at low input voltage and allows a gate-to-source input voltage of 0.5 V. These characteristics improve the robustness of the proposed technique and exhibits great potential for a wide input range of EH applications.
Keywords
Charge pump, DC-to-DC conversion, Dynamic voltage frequency scaling (DVFS), Energy harvesting, Ring-voltage controlled oscillator (RO)
Divisions
sch_ecs
Funders
[IF071-2020],[RK002-2021]
Publication Title
Analog Integrated Circuits and Signal Processing
Volume
111
Issue
1
Publisher
Springer
Publisher Location
VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS