Zachary Nosker

Single inductor dual output DC-DC converter design with exclusive control

This paper proposes a single inductor dual output (SIDO) DC-DC Converter with exclusive control circuit. We propose two kinds of converter: a buck-buck and a boost-boost converter. Multiple voltage outputs are controlled exclusively, using error voltage feedback. This approach requires few additional components (a switch, a diode and a comparator), requires no current sensors and does not depend on the value of output voltage or output current. We describe circuit topologies, operation principles and simulation results.

DC-DC converter with continuous-time feed-forward Sigma-Delta modulator control

This paper describes applications of continuous-time feed-forward Sigma-Delta (ΣΔ) modulators to control DC-DC converters as follows. We propose to use continuous-time feed-forward ΣΔ controllers in DC-DC converters, and show that their transient response is faster than discrete-time and/or feedback-type ΣΔ controllers. We also show that second-order ΣΔ controllers have superior performance to first-order ones. SPICE and Matlab simulations substantiate these results.

Single-Inductor Dual-Output DC-DC Converter Design with Exclusive Control

This paper proposes a single inductor dual output (SIDO) DC-DC converter with an exclusive control circuit. We propose two kinds of converter: a buck-buck and a boost-boost converter. Multiple voltage outputs are controlled exclusively, using error voltage feedback. This approach requires a few additional components (a switch, a diode and a comparator), but requires no current sensors and does not depend on the value of output voltage or output current. We describe circuit topologies, operation principles and simulation results.

Continuous-Time Delta-Sigma Controller for DC-DC Converter

This paper describes applications of a Delta-Sigma (ΔΣ) modulator to control a DC-DC converter. We propose to use a continuous-time (CT) feed-forward (FF) ΔΣ controller in a DC-DC converter and show that its transient response is faster than discrete-time (DT) and/or feedback-type (FB) ΔΣ controllers. We have also performed experiments of a DC-DC converter with a first-order continuous-time feedback ΔΣ controller and show its results.

High-Speed Response Single Inductor Multi Output DC-DC Converter with Hysteretic Control

 Abstract— This paper proposes two kinds of new single-inductor dual-output (SIDO) DC-DC switching converters with ripple-based hysteretic control. First SIDO converters of type 1 utilize the triangular signal generated by the CR-circuit connected across the inductor. This triangular signal is used for generating the PWM signal instead of the saw-tooth signal used in the conventional converters. Second SIDO converters of type 2 utilize the triangular signal generated by the CR-circuit connected across the voltage error amplifier. This paper describes circuit topologies, operation principles, simulation results and experimental results of the proposed SIDO converters. In simulation results of both type of SIDO converters, static output voltage ripples are less than 5mVpp and over/under shoots of the dynamic load regulations for the output current step are less than +/10mV. In experimental results of single output converter of type 2, static output voltage ripples are about 20mVpp. Output ripples of SIDO type 1 converter are about 80mVpp.

Self-Calibration Techniques of Pipeline ADCs Using Cyclic Configuration

This paper proposes a digital self-calibration technique for pipelined ADC. In this technique, the pipelined ADC is composed of a series of cyclic ADCs and each stage has independent digital self-calibration. Because of this, our technique achieves higher accuracy calibration than the conventional method that calibrates by using later stages. Applying the proposed method, we simulated the pipelined ADC with MATLAB and showed that higher accuracy calibration can be achieved with a smaller number of pipeline stages.

A High Efficiency, Extended Load Range Boost Regulator Optimized Forenergy Harvesting Applications

A small, low power bootstrapped boost regulator is introduced that can start upwith an input voltage of 240mV and achieve a maximum efficiency of 96%. The proposed circuituses two separate control schemes for startup and steady-state operation. A xed-frequencyoscillator is used to initially start up the circuit and raise the output voltage. Once the outputvoltage has reached a level adequate to bias the internal circuitry, a constant-on-time stylehysteretic control scheme is used, which helps increase system efficiency compared to using aconventional Pulse-Width-Modulated control scheme. While maintaining a high efficiency, theproposed circuit only requires 3 external components|2 capacitors (input and output) and aninductor. The e ectiveness of this approach is shown through Spectre simulation results.

Architecture of High-Efficiency Digitally-Controlled Class-E Power Amplifier

This paper describes the analysis and design of digitally-controlled class-E power amplifiers, which are suitable for fine CMOS implementation. Two methods for implementing digitally-controlled class-E(-like) amplifiers have already been proposed: using NMOS switch arrays or digital PWM. In this paper we analyze the operation and efficiency of these methods, and then we propose combining them to achieve higher efficiency.