We describe a 25x25 pixel image sensor which spatially filters a set of input currents supplied by an array of phototransistors by two orientation selective image filters. The filters are similar to even and odd Gabor filters, which have been used to model the receptive fields of neurons in the visual cortex. The circuit architecture implementing the image filter consists of two resistive netwo...

Abstruct'lkansport properties of ungated Si/Sil --z Ge, are studied by an ensemble Monte Carlo technique. The device performance is studied with a quantum hydrodynamic equation method using the Monte Carlo results. The phonon-scatteringlimited mobility is enhanced over bulk Si, and is found to reach 23000 cm2/Vs at 77 K and 4000 cm2Ns at 300 K. The saturation velocity is increased slightly comp...

In this work, by means of Monte Carlo simulations, the static and dynamic behavior of isolated-gate InAs/AlSb high electron mobility transistors (Sb-HEMTs) has been studied and compared with experimental results. The influence of the existence of a native oxide under the gate, the value of the surface charges in the gate recess and the possible variation of electron sheet carrier density, ns, h...

In this paper, a simple non-linear analytical charge control model for the DC and microwave characteristics of AlGaN/GaN MODFET is presented. The effect of parasitic resistances s R and d R is also incorporated. The model has also been extended to obtain the expressions for transconductance, drain conductance and cut-off frequency of the device. The model predicts a high transconductance of 502...

This paper is in continuation with the very recent work of Prasad et al. [14], wherein new realizations of grounded and floating positive inductor simulator using current differencing transconductance amplifier (CDTA) are reported. The focus of the paper is to provide alternate realizations of lossless, both positive and negative inductor simulators (PIS and NIS) in grounded form using z-copy c...

In this paper a low power CMOS sub-harmonic mixer based on the Gilbert cell for 2.4 GHz ISM band application is presented, in which the position of the switching and transconductance stages of mixer has been exchanged. A tuning out inductor has been used between the RF and LO switching stages to improve the linearity and noise figure, and also to enhance the conversion gain of the Mixer. The ut...

A model that explains the unusual characteristics of the AlGaAs/GaAs modulation-doped field-effect transistor (MODFET) with InAs quantum dots incorporated in the GaAs channel is presented. It is shown that the negative charge of electrons confined in quantum dots decreases the threshold gate–drain voltage at which the channel is fully depleted. This provides an impact ionization of quantum dots...

Industry is continuously researching techniques to reduce power requirements, while increasing speed, to meet the demands of today’s low (battery) powered wireless systems. The operational transconductance amplifier (OTA) is a fundamental building block in analog (mixedsignal) design and its performance characteristics are the foundation of system level characteristics. Improving the performanc...

the variances for the steady-state case, known results can be used effect of channel length modulation is not included in (1) but is [2], [3]. Therefore, it is possible to plot diagrams of the statistics separately taken into account when considering output conducagainst the register length used and choose on the basis of such tance in the proposed circuits. diagrams the required register lengt...

A high-current, wide-band transconductance amplifier is described that provides an unprecedented level of output current at high frequencies with exceptional stability. It is capable of converting a signal voltage applied to its input into a groundreferenced output rms current up to 100 A over a frequency range from dc to 100 kHz with a useable frequency extending to 1 MHz. The amplifier has a ...