The stability margin of an audio power amplifier is reduced by a pole in the loopgain transfer function caused by shunt capacitance in the loudspeaker load. The problem is most severe in amplifiers with output stages that have a high output impedance before feedback. Because MOSFET devices can have an output impedance that is much higher than BJT devices, amplifiers with WFlT output stages are ...

The operational amplifiers (OPAMP) are basic building blocks in implementing a variety of analog circuits such as amplifiers, filters, integrators, differentiators, summers, oscillators etc. OPAMPs work well for lowfrequency applications, such as audio and video systems. For higher frequencies, however, OPAMP designs become difficult due to their frequency limit. At those high frequencies, oper...

The potential to exploit single-walled carbon nanotubes (SWNTs) in advanced electronics represents a continuing, major source of interest in these materials. However, scalable integration of SWNTs into circuits is challenging because of difficulties in controlling the geometries, spatial positions, and electronic properties of individual tubes. We have implemented solutions to some of these cha...

To perform correct measurements on a true digital audio amplifier (TDAA), it is important to understand the characteristics of the device, especially in comparison with conventional linear amplifiers such as class-A and class-AB. This report provides an overview of TI’s proprietary digital amplification technology and information about how measurements on TDAA’s must be performed in order to ob...

Engineers designing audio equipment for the high-end audiophile or professional recording markets have a limited selection of high-resolution signal amplifiers that will meet end-user demands for both outstanding objective and critical subjective performance. Suitable devices must provide a combination of state-of-the-art specifications for low noise and ultra-low distortion along with high GBP...

Class D power amplifiers, one of the most critical devices for application in sound systems, face severe challenges due to increasing requirement smartphones, digital television, sound, and other terminals. The audio amplifier has developed from a transistor field-effect tube amplifier, amplifiers have made significant progress circuit technology, components, ideological understanding. stumblin...

Electron tube amplifiers may make use of either radio-frequency amplification or audio-frequency amplification, or both. Radio-frequency amplification consists in the amplification of the received radio-frequency current before it is detected. The use of radio-frequency amplification makes it possible to receive a very weak signal which can not be heard at all if only audio-frequency amplificat...