High Frequency Current Mode Class-D Amplifiers With High Output Power and Efficiency By Anthony Lawrence Long A 13 watt Current Mode Class-D (CMCD) with 60% efficiency is presented. This amplifier is the highest power switch mode microwave power amplifier reported to date. The CMCD architecture is an improvement over the Voltage Mode Class-D in that the parasitic reactance in the active device ...

Switch-mode technology is the common choice for high-efficiency audio power amplifiers. The dynamic nature of real limits achievable continuous output thus reducing efficiency. Based on methods used radio frequency (RF) amplifiers, this article proposes a tracking multilevel supply (TMLPS) in order to improve system A simple prototype designed and tested up 200 W. Measured results show that emp...

There are many different designs for audio amplifiers. Class-D, or switching, amplifiers generate their output signal in the form of a high-frequency square wave of variable duty cycle (ratio of on time to off time). The square-wave nature of the output allows a particularly efficient output stage, with minimal losses. The output is ultimately filtered to remove components of the spectrum above...

Power-amplifier efficiency is a significant issue for the overall efficiency of most wireless system. Therefore, currently there are different kind of Switched mode power amplifiers are developed which are showing very high efficiency also at higher frequencies but all of these amplifiers are subjected to drive with the constant envelope signals. Whereas, for the increasing demand of high data ...

We generalize the standard quantum model (Caves 1982 Phys. Rev. D 26 1817) of the noise properties of ideal linear amplifiers to include the possibility of non-ideal behavior. We find that under many conditions the non-ideal behavior can be described simply by assuming that the internal noise source that describes the quantum noise of the amplifier is not in its ground state. We validate this m...

Operational amplifiers (op amps) are as prolific in analog circuits as salt and pepper is on food. They are sprinkled throughout the sensor data acquisition system, performing a variety of functions. For instance, at the sensor interface, amplifiers are used to buffer and gain the sensor output. The current or voltage excitation to the sensor, quite often is generated by an amplifier circuit. F...

CIV: N/A TSR: Yes, except N/A for MT, and ‘‘technology’’ for the ‘‘development’’ or ‘‘production’’ of: (a) Traveling Wave Tube Amplifiers described in 3A001.b.8, having operating frequencies exceeding 19 GHz; (b) solar cells, coverglass-interconnect-cells or covered-interconnect-cells (CIC) ‘‘assemblies,’’ solar arrays and/or solar panels described in 3A001.e.4; (c) Microwave ‘‘Monolithic Integ...

Reading: For the quantum theory of beam splitters: • C.C. Gerry and P.L. Knight, Introductory Quantum Optics (Cambridge University Press, Cambridge, 2005) Sect. 6.2. For the quantum theory of linear amplifiers: • C.M. Caves, “Quantum limits on noise in linear amplifiers,” Phys. Rev. D 26, 1817–1839 (1982). • L. Mandel and E. Wolf, Optical Coherence and Quantum Optics (Cambridge University Press...