Fault diagnosis of analogue circuits is essential for analogue and mixed-signal systems testing and maintenance. A new method is proposed in this paper for multiple fault diagnosis of linear analogue circuits in frequency domain. The Woodbury formula is applied to the modi9ed nodal equation to construct the fault diagnosis equation, which relates the limited measured circuit responses with the ...

Dielectric measurement techniques are used widely for estimation of water content in environmental media. However, factors such as temperature and salinity affecting the readings require further quantitative investigation and explanation. Theoretical sensitivities of capacitance sensors to liquid salinity and temperature of porous media were derived and computed using a revised electrical circu...

An analogue electronic model of a cochlea was developed some years ago by R. F. Lyon using a cascade of filters. Combined with an analogue gradient descent circuit, such an artificial cochlea can be used to extract the Linear Predictive Coding (LPC) of the speech signal in continuous time. We propose in this article an analogue VLSI circuit implementing a so-called 'Cochlear LPC' (CLPC). We dis...

Burn-in is accepted as a way to evaluate ageing effects in an accelerated manner. It has been suggested that burn-in stress may have a significant effect on the Negative Bias Temperature Instability (NBTI) of subthreshold CMOS circuits. This paper analyses the effect of burn-in on NBTI in the context of a Digital to Analogue Converter (DAC) circuit. Analogue circuits require matched device pair...

Despite excellent high frequency and high speed performance, current-feedback operational ampli ̄ers (CFOAs) generally exhibit poor common-mode rejection (CMRR) properties, which limit their utility [Analogue IC design: The current mode approach, IEE Circuits and Systems Series, Peter peregrinus, 1990]. A novel current feedback operational ampli ̄er (CFOA) with improved performance is presented. ...

The present paper introduces a novel analogue nonlinear circuit that exhibit rich dynamics. The proposed fourth order circuit is based on a piecewise linear algebraic nonlinear function, with discontinuity in the origin. The dynamic part of the system is developed by closing two feedback loops around a differential amplifier, which drives the nonlinear circuit. For a wide range of parameter val...

Custom design of integrated circuits is required for the development of digital standard-cell and bit-slice libraries, analog circuits, and other specialized circuits that are not commercially available. Teaching students the design and verification flow at this physical level is valuable in that it provides the understanding and skills they will need to perform these functions in their subsequ...

A new first order voltage mode all-pass filter circuit using two differential difference current conveyors (DDCCs) (with suppressed output stages) as active elements and two passive components is proposed. The given circuit enjoys the features of high input impedance and low output impedance, which is desirable feature for voltage-mode circuits. In spite of employing two active elements the cir...

This paper presents a general-purpose sampled-data analogue processing element that essentially functions as an analogue microprocessor (AμP). The AμP executes software programs, in a way akin to a digital microprocessor, while nevertheless operating on analogue sampled data values. This enables the design of mixed-mode systems which retain the speed/area/power advantages of the analogue signal...

We propose a novel semiconductor device in which electronic-analogue dendritic trees grow on multilayer single-electron circuits. A simple cellular-automaton circuit was designed for generating dendritic patterns by utilizing the physical properties of single-electron devices, i.e. quantum and thermal effects in tunneling junctions. We demonstrate typical operations of the proposed circuit thro...