Victor Adrian

  • Citations Per Year
Learn More
A digital Class-D amplifier comprises a pulsewidth modulator (PWM) and an output stage. In this paper, we simplify the time-domain expression for the algorithmic PWM linear interpolation (LI) sampling process and analytically derive its double Fourier series expression. By means of our derivation, we show that the nonlinearities of the LI process are very(More)
We present a micropower digital modulator for class-D amplifiers for power-critical digital hearing aids. The modulator design embodies a proposed Lagrange interpolation (a combined firstand second-order Lagrange) algorithmic pulsewidth modulation (PWM) and a third-order noise shaper. By means of double-Fourier-series analysis, we analyze and determine the(More)
One of the main components in a digital class D amplifier is the digital modulator. This modulator is necessary so that an N-bit digital input can be converted into 1-bit modulated pulses, which in turn are used for high efficiency operation in the output stage of the class D amplifier. In this paper, we review three design methods for digital modulators.(More)
Switched-mode dc-dc converters are routinely employed in the power supply section of low-power electronic systems, such as biomedical implants, to convert a supply voltage from one voltage level to another voltage level. The switched-mode dc-dc converter employs a modulator to modulate the output pulses. In Pulse Width Modulation (PWM)-based digital(More)
We present an output stage design for high switching frequency DC-DC converters. The output stage comprises level-shifters, gate drivers, and power transistors. Gate drivers designed with the low voltage-swing method are evaluated against the standard full voltage-swing. Based on the simulation results, the gate drivers with the full voltage-swing results(More)