Voltage Conversion Range Research Articles

Low-Power Level Shifter for Multi-Supply Voltage Designs

In this brief, a new low-power level shifter (LS) is presented for robust logic voltage shifting from near/sub-threshold to above-threshold domain. The new circuit combines the multi-threshold CMOS technique along with novel topological modifications to guarantee a wide voltage conversion range with limited static power and total energy consumption. When implemented in a 90-nm technology process, the proposed design reliably converts 180-mV input signals into 1-V output signals, while maintaining operational frequencies above 1-MHz, also taking into account process-voltage-temperature variations.Post-layout simulation results demonstrate that the new LS reaches a propagation delay less than 22 ns, a static power dissipation of only 6.4 nW, and a total energy per transition of only 74 fJ for a 0.2-V 1-MHz input pulse.

The Design of General Analog to Digital Converter

We designed one kind of general A/D converter based on the NuMicro M0516 processor. Taking the realize of AD574A for example to illustrate the process of using this processor. We solved the interface between digital input and analog input, and yet, came up with the method for the realization of software programming. Application results prove that this kind of A/D converter is programmable, high precision, and the voltage conversion range is large, what's more, its price is relative lower and so it has a certain practicality and popularize value.

A 90–240 MHz Hysteretic Controlled DC-DC Buck Converter With Digital Phase Locked Loop Synchronization

This paper reports a digital phase locked loop (D-PLL) based frequency locking technique for high frequency hysteretic controlled dc-dc buck converters. The proposed converter achieves constant operating frequency over a wide output voltage range, eliminating the dependence of switching frequency on duty cycle or voltage conversion range. The D-PLL is programmable over a wide range of parameters and can be synchronized to a clock reference to ensure proper frequency lock and switching operation outside undesirable power supply resonance bands. The stability and loop dynamics of the proposed converter is analyzed using an analog equivalent PLL behavioral model which describes the dc-dc converter as a voltage-controlled oscillator (VCO). We demonstrate a 90-240 MHz single phase converter with fast hysteretic control and output conversion range of 33%-80%. The converter achieves an efficiency of 80% at 180 MHz, a load response of 40 ns for a 120 mA current step and a peak-to-peak ripple less than 25 mV. The circuit was implemented in 130 nm digital CMOS process.

Buck–Boost-Type Unity Power Factor Rectifier With Extended Voltage Conversion Ratio

A buck-boost-type unity power factor rectifier is proposed in this paper. The main advantage of the proposed rectifier over the conventional buck-boost type is that it can perform input power factor correction (PFC) over a wider voltage conversion range. With a single switch, a fast well-regulated output voltage is achieved with a zero-current switch at turn-on. Moreover, the switch voltage stress is independent of converter load variation. The proposed converter is well suited for universal offline PFC applications for a low power range (<150 W ). The feasibility of the converter is confirmed with results obtained from a computer simulation and from an experimental prototype.