A high-efficiency cross-coupled charge pump for flash memories

Wang, Yiran; Zong-guang, YU

doi:10.1109/icacc.2010.5486757

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…Symmetric SC converters have the advantage of lower output resistance [46][47][48]. They consist of n converters connected in parallel, each one identical in topology and component values, but operating in opposite topological states.…”

Section: Complementary Methods For Symmetric Sc Convertersmentioning

confidence: 99%

A Regulated 400-mV CMOS DC-DC Converter with On-the-Fly Equivalent Output Resistance Tuning

et al. 2023

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Energy harvesting is a technology that can be applied to IoT systems to eliminate the need for batteries. Many types of energy sources are available for energy harvesting, such as light, thermal, vibration, and electromagnetic energy. Indoors, where most IoT devices are located, artificial light, such as from LED lamps, can be used for energy harvesting in circuits with very ultra-low power consumption. Integrated switch-capacitor DC-DC converters are required for this type of system to convert the harvested energy into a constant output voltage suitable for powering an electronic circuit. The idea of this work is to use a hysteretic feedback control consisting of comparators and a logic system to adjust the switching frequency and the voltage conversion ratio (VCR) of the converter. With this, the equivalent output resistance is tuned to a value that results in a constant output voltage. A new method for modeling the equivalent output resistance based on charge flow analysis is proposed, which also considers the effects of source resistance. An integrated energy-harvesting system consisting of a switched-capacitor DC-DC converter is implemented to obtain an output voltage of 400 mV using a small photovoltaic cell for energy harvesting from indoor light. The proposed system can power an ultra-low-power device between 20 μW and 40 μW with a minimum input voltage of 230 mV. Electrical simulation results show that the implemented converter can achieve a peak efficiency of 81.24% at an input voltage of 260 mV for a 20 μW load.

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Section: Complementary Methods For Symmetric Sc Convertersmentioning

confidence: 99%

A Regulated 400-mV CMOS DC-DC Converter with On-the-Fly Equivalent Output Resistance Tuning

et al. 2023

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“…The previous research has been focused on the on the theoretical and practical analysis of the crosscoupled charge pump [5], [6]. Analysis results show the charge pump description based on the equivalent digitals models does not comply with the simulation results of the real structure [5].…”

Section: Introductionmentioning

confidence: 99%

Description of the functional blocks for the cross-coupled charge pump design algorithm

Marek

Hospodka

Subrt

2017

2017 International Conference on Applied Electronics (AE)

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This paper presents the circuit model that is used for the cross-coupled charge pump design algorithm. Symbolic description of the pump stage model as an analog functional block for high-voltage application is firstly discussed. Design process has been done by using simplified BSIM model equations assuming the long channel MOSFET. Characteristics have been verified by ELDO Spice and compared with the found relationships. Static and dynamic parameters of the subcircuit have been tested in two-stages structure by LT Spice simulator. Analysis results show the consistency between model and real circuits characteristics under given conditions. Complex model provides the reliable results for significantly smaller strange capacitances in comparision with the main pump capacitances. The model can be used for design and prediction of the pump parameters without long-time simulation process. The strong inversion region of MOSFET is expected, thus equations are correct for other MOSFET models that are used in chip design (PSP).

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“…Easy integrability is among the main advantages of DC/DC converters without inductors. Modern architecture of the cross-coupled charge pump [1] with driving feedback circuit was presented in detail from theoretical analysis [2,3] through the simulations of real properties [4,5] to the mathematical model [6,7], which is including important properties of the circuit structure. The pump stage has been described as an analog subcircuit, labeled X n and X L see Fig.…”

Section: Ondrej Subrt 1 Introductionmentioning

confidence: 99%

Complex model description and main capacitor sizing for the cross-coupled charge pump synthesis process

Marek

Hospodka

Subrt

2018

Journal of Electrical Engineering

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This paper presents a dynamic part of the pump stage model of the cross-coupled charge pump. The complex model has been used for both the estimation of the N-stage pump properties in a wide range of the input parameters and derivation of equations for synthesis process, as the main capacitor sizing, which is also mentioned in the article. Dynamic part of the model (pump stage capacitances) is determined from Ward’s capacitance piece-wise model through the BSIM MOSFET model equations. Main capacitor and load capacitor sizing are based on the time response characteristics fulfilling the system behavior in time. Guideline on the MOS transistor sizing as the nonlinear main pump capacitor and specification of the diode transistor for the design process are also clarified. The characteristics of the proposed circuit have been verified in the professional design environment Mentor graphics and analysis algorithm based on the state-space description of the inner complex model was programmed in Maple SW. The main benefit is to offer the alternative way of the charge pump synthesis by using the complex model and symbolic description of all formulae to find the required pump parameters without long-time simulation process.

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A high-efficiency cross-coupled charge pump for flash memories

Cited by 8 publications

References 6 publications

A Regulated 400-mV CMOS DC-DC Converter with On-the-Fly Equivalent Output Resistance Tuning

A Regulated 400-mV CMOS DC-DC Converter with On-the-Fly Equivalent Output Resistance Tuning

Description of the functional blocks for the cross-coupled charge pump design algorithm

Complex model description and main capacitor sizing for the cross-coupled charge pump synthesis process

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