The basic properties of programmable analogue arrays are described and the problem of quantifying the fitness of an analogue circuit is discussed. A set of blocks appropriate for use in an evolutionary algorithm is described and results presented showing how an evolutionary algorithm using these blocks can learn to produce a given input-output characteristic. Finally an example is presented sho...

The enhancement-mode MOSFET is the primary active device used in present-day digital and mixed-signal integrated circuit processes. Thus, it is important to introduce this device and associated circuit design methods early in the electronics curriculum. This article discusses four integrated circuit MOSFET amplifier configurations; the current source/active load stage, the source follower, the ...

Various measurement and control systems use magnetic or optical encoders that transform linear displacement and other physical quantities to an analogue quadrature signal. In this paper, we study the problem of, how to accurately delay the analogue quadrature signals in the Sin/Cos encoders within the range of ±10° with the circuit that is potentially integrable on a single chip. Such precision...

Most analogue systems are designed manually because automatic circuit synthesis tools are presently available for only a limited range of design problems. This paper presents a new approach to circuit synthesis based on Genetic Algorithms. Using this method it is possible in principle to synthesize circuits to meet any linear or non-linear, frequency-domain or time-domain, specification. When a...

Gillian Marshall and Steve Collins DRA Malvern, UK INTRODUCTION In this paper we describe an analogue VLSI circuit which implements the Radial Basis Function (RBF) algorithm, based around a compact Euclidean Distance calculator. A prototype chip has been fabricated and tested. First, we describe the RBF architecture and present results from the test chip. We then discuss the impact of device va...

Silicon Readout Integrated Circuits (ROIC) for HgCdTe Focal Plane Arrays of 1x4 and 72x4 photovoltaic detectors are represented. The analog circuit blocks are completely identical for both, while the digital control circuit is modified to take into account the larger array size. The manufacturing technology is 0.35μm, double poly-Si, three-metal CMOS process. ROIC structure includes four elemen...

a complete procedure for the design of w-band low noise amplifier in mmic technology is presented. the design is based on a simultaneously power and noise matched technique. for implementing the method, scalable bilateral transistor model parameters should be first extracted. the model is also used for transmission line utilized in the amplifier circuit. in the presented method, input/output ma...

Operational amplifiers are an integral part of many analog and mixed signal systems. As the demand for mixed mode integrated circuits increases, the design of analog circuits such as operational amplifiers in CMOS technology becomes more critical. This paper presents a two stage CMOS operational amplifier, which operates at ±1.8V power supply using TSMC 0.18um CMOS technology. The OP-AMP design...

Software configurable analogue arrays offer an intriguing platform for automated design by evolutionary algorithms. Like previous evolvable hardware experiments, these platforms are subject to noise during physical interaction with their environment. We report preliminary results of an evolutionary system that uses concepts from gene expression to both discover and decide when to deploy analogu...