Preamplifier Research Papers - Academia.edu (original) (raw)

The explosion-like spread of mobile telecommunication raises the problem of the exposure of the user to the electromagnetic field. The most realistic experimental investigations of the exposure can be made in phantoms. An E-Field probe... more

The explosion-like spread of mobile telecommunication raises the problem of the exposure of the user to the electromagnetic field. The most realistic experimental investigations of the exposure can be made in phantoms. An E-Field probe has been developed for this purpose. The isotropic probe consists of three mutually perpendicular short dipole antennas with zero-bias diodes in the gap and highly resistive wires to the preamplifier. The device can be applied in liquid phantoms. The technical details and first measurements are given

This paper is aimed to design a preamplifier for bio signal such as electromyography (EMG) which records the muscular activity of the human body. Surface EMG are used because it assesses muscle function by recording muscle activity from... more

This paper is aimed to design a preamplifier for bio signal such as electromyography (EMG) which records the muscular activity of the human body. Surface EMG are used because it assesses muscle function by recording muscle activity from the surface above the muscle on the skin. Surface electrodes are able to provide only a limited assessment of the muscle activity. The activity of the muscle are recorded in the form of waveform in the cathode ray oscilloscope (CRO).The input voltage, output voltage and the gain of the different muscular movements are tabulated.

Amplifiers are widely used in signal receiving circuits, such as antennas, medical imaging, wireless devices and many other applications. However, one of the most challenging problems when building an amplifier circuit is the noise, since... more

Amplifiers are widely used in signal receiving circuits, such as antennas, medical imaging, wireless devices and many other applications. However, one of the most challenging problems when building an amplifier circuit is the noise, since it affects the quality of the intended received signal in most wireless applications. Therefore, a preamplifier is usually placed close to the main sensor to reduce the effects of interferences and to amplify the received signal without degrading the signal-to-noise ratio. Although different designs have been optimized and tested in the literature, all of them are using larger than 100 nm technologies which have led to a modest performance in terms of equivalent noise charge (ENC), gain, power consumption, and response time. In contrast, we consider in this paper a new amplifier design technology trend and move towards sub 100 nm to enhance its performance. In this work, we use a pre-well-known design of a preamplifier circuit and rebuild it using 45 nm CMOS technology, which is made for the first time in such circuits. Performance evaluation shows that our proposed scaling technology, compared with other scaling technology, extremely reduces ENC of the circuit by more than 95%. The noise spectral density and time resolution are also reduced by 25% and 95% respectively. In addition, power consumption is decreased due to the reduced channel length by 90%. As a result, all of those enhancements make our proposed circuit more suitable for medical and wireless devices. This is an open access article under the CC BY-SA license.

Presented is an integrated circuit dual-channel front-end preamplifier that minimises the differential time delay (DTD) between two channels. The circuit, which is based on a chopper architecture, works in the audio range and is intended... more

Presented is an integrated circuit dual-channel front-end preamplifier that minimises the differential time delay (DTD) between two channels.
The circuit, which is based on a chopper architecture, works in the audio range and is intended for applications in sound localisation based on bearing estimation. The circuit was fabricated in a 1.5 × 1.5mm die, in a 0.5 mm technology. Experimental results indicate a mean DTD of 0.125 ms, which is one order of magnitude smaller than the experimental results reported in the literature so far.

Low frequency noise measurements have been successfully used in research laboratories for the characterization of electromigration in interconnection lines of integrated circuits. In this paper an ultra-low noise system capable of... more

Low frequency noise measurements have been successfully used in research laboratories for the characterization of electromigration in interconnection lines of integrated circuits. In this paper an ultra-low noise system capable of performing such measurements contemporaneously on a statistically significant number of samples is described. The system, designed with the aim to make advantageous the utilization of the technique also in industrial environment, is controlled by a personal computer and makes available up to 255 independent input channels for noise measurements. A purposely designed ultra-low noise preamplifier and the use of an optical link between the PC and the low noise section, has allowed to obtain a total background noise which is some orders of magnitude lower than that of preexistent instrumentation