This paper describes the operation of three types of charge pump circuits. Power efficiency theory of charge pumps is discussed. A method of estimating the output ripple of a charge pump from the size of the capacitors used is described. A new charge pump circuit that uses two cascoded buffer transistors to improve the area efficiency is proposed.

Abstract Microresonators of ultrahigh quality ( Q ) factors represent a crucial type photonic devices aiming at ultra-high spectral resolution, sensitivity to the environmental perturbations, and efficient nonlinear wavelength conversions low threshold pump powers. Lithium niobate on insulator (LNOI) microdisks high are particularly attractive due its large second-order coefficient strong elect...

We experimentally demonstrate an optical parametric oscillator, whose signal pumps another difference-frequency generation process. Engineered idler frequency coincidence of both processes in a single quasiperiodic crystal improves pump-to-idler slope efficiency by 52.8%, from 15.25% to 23.3%, and pump-to-idler conversion efficiency (at an average pump power of 1.2 W) by 16.6%, from 12.5% to 14...

The efficiency of conversion of electrical power into fluidic power in an electrohydrody-namic (EHD) pump depends on the bulk fluid velocity. An analytical formulation is developed for calculation of the efficiency of an EHD pump, with and without the presence of a superimposed flow due to an externally imposed pressure gradient. This formulation is implemented into a numerical model, which is ...

In this paper the centrifugal pump performances are tested when handling water and viscous oils as Newtonian fluids. Also, this paper shows a numerical simulation of the three-dimensional fluid flow inside a centrifugal pump. For these numerical simulations the SIMPLEC algorithm is used for solving governing equations of incompressible viscous/turbulent flows through the pump. The k-ε turbulenc...

Charge pump circuits are used to obtaining higher voltages than normal power supply voltages in low voltage Phase Lock Loop (PLL), flash Memories & DRAM’s. New integrated Dickson Charge pump design with charge transfer switches (CTS’s) is optimized and compared including the losses due to devices parasitic is described. Results show that the CTS based Dickson charge pump is the best structure f...

Graphene has strong electro-optic effect which can be used to enhance the modulation efficiency of nanoscale photonic circuit. This paper describes recent developments for nearinfrared electro-optic modulator based on silicon-graphene hybrid structure. OCIS codes: (070.6120) Spatial light modulators; (070.5753) Resonators; (350.4238) Nanophotonics and photonic crystals

We report on a diode-pumped Tm:KYW microchip laser generating 1 W continuous-wave output power. The laser operates at a wavelength of 1.94 μm in the fundamental TEM(00) mode with 71% slope efficiency relative to the absorbed pump radiation and 59% slope efficiency relative to the incident pump radiation. The optical-to-optical laser efficiency is 43%.