A 280 mW, 0.07% THD+N class-D audio amplifier using a frequency-domain quantizer

A Second-Order Class-D Audio Amplifier

Class-D audio amplifiers are particularly efficient, and this efficiency has led to their ubiquity in a wide range of modern electronic appliances. Their output takes the form of a high-frequency square wave whose duty cycle (ratio of on-time to off-time) is modulated at low frequency according to the audio signal. A mathematical model is developed here for a second-order class-D amplifier desi...

Class D audio amplifier with Ferroxcube gapped toroid output filter

Class D Audio Amplifier Performance Relationship to MOSFET Parameters

Page Abstract ............................................................................................................2 Introduction ......................................................................................................2 Key MOSFET Electrical Parameters in Class D Audio Amplifiers ....................2 Drain Source Breakdown Voltage BVDSS........................................

A Sub-µW Tuneable Switched-Capacitor Amplifier-Filter for Neural Recording Using a Class-C Inverter

A two stage sub-µW Inverter-based switched-capacitor amplifier-filter is presented which is capable of amplifying both spikes and local field potentials (LFP) signals. Here we employ a switched capacitor technique for frequency tuning and reducing of 1/f noise of two stages. The reduction of power consumption is very necessary for neural recording devices however, in switched capacitor (SC) cir...

Design of a Fully Differential Power Output Stage for a Class D Audio Amplifier Using a Single-Ended Power Supply

This paper presents a full-bridge discrete power output stage for a Class D audio amplifier using a single-ended power supply. The circuit receives a digital control signal with 5 V of amplitude and it generates a floating differential output voltage up to 20 V of amplitude from a single 20 V power supply voltage. Using as control signal a pulse density modulation (PDM) wave generated by an opt...