A wide variety of semiconductor devices are used in wireless power amplifiers. The RF performance and other attributes of cellphone RF power amplifiers using Si and GaAs based technologies will be reviewed and compared.

Class AB differential amplifiers using composite BiCMOS and bipolar transistors are introduced. Their utilization for the implementation of low voltage (+-1.65V) operational amplifiers with high slew rate and rail to rail common mode input voltage range is discussed.

We examine the read noise of the spare UVIS-2 detector of the Wide Field Camera 3 during its second thermal vacuum campaign at the Goddard Space Flight Center. Only the frames acquired in the default readout mode are considered : a gain = 1.5 e/DN, a four amplifier readout (ABCD), and no on-chip binning. The read noise is calculated from the serial virtual overscan region of each quadrant. From...

An advanced dynamic model for multisection semiconductor optical amplifiers is Presented. It accounts for the carrier and field distributions in the longitudinal direction as well as for the facet reflectivities. The model can handle arbitrary time-varying input signals and current modulations. Here the model is used to assess intermodulation distortion and crosstalk. First, cascaded amplifiers...

For about a year I have been experimenting with extremely high intercept amplifiers using 2N5109 bipolar junction transistors (BJTs). These kinds of amplifiers, known as common base transformer feedback (CBTF) amplifiers, and also known as common base noiseless feedback amplifiers, if properly designed and used, offer MW DXers (and SW DXers, though their needs are not as extreme as MW DXers) am...

This audio quality measurement Application Note is geared towards describing the methods for measurement of key audio specifications. Each analysis technique described here in, can be applied to audio ADCs, DACs, Analog Mixers, or any signal within the audio band. Audio quality is typically gauged by three main components. They are Signal to Noise Ratio, Total Harmonic Distortion, and Frequency...

Two different circuit models of RC coupled small-signal amplifiers are developed using identical power MOSFETs in Darlington pair configuration. Proposed circuits successfully eliminate the poor frequency response problem of Darlington pair amplifiers at higher frequencies. An additional biasing resistance RA, ranging from 1KΩ to 100KΩ, is to be essentially used in the proposed circuits to main...

This audio quality measurement Application Note is geared towards describing the methods for measurement of key audio specifications. Each analysis technique described here in, can be applied to audio ADCs, DACs, Analog Mixers, or any signal within the audio band. Audio quality is typically gauged by three main components. They are Signal to Noise Ratio, Total Harmonic Distortion, and Frequency...

Amplifiers are one of the most important components in an optical WDM network, and they are used to restore the strength of optical signals which are attenuated by optical fibers as they propagate through the network. However, amplifiers also introduce the spontaneous emission noise which degrades the optical signal-to-noise ratio (OSNR). In this paper, we study the amplifier placement problem ...

Information revolution implies that multimedia networks need high bandwidth real-time communication services. At present, optical fibre is the only transmission medium offering such large bandwidth with low loss communication links. To amplify an optical signal with a conventional repeater, one performs photon to electron conversion, electrical amplification, retiming, pulse shaping, and then e...