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...

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...

We present an analogue VLSI circuit that performs morphological image processing operations on the focal plane. The circuit has been fabricated using a standard digital CMOS process. We exploit the parallelism of morphological image processing operations by using the massively parallel architecture of analogue VLSI arrays, achieving both high-speed and low-power computation [1]. The analogue ci...

Nowadays, due to the increasing complexity of circuits and systems incorporating mixedsignal components, many designers recognise the advantages of, and in some cases the necessity for, mixed-signal modelling and simulation of the circuits and systems as a whole prior to, during and post production of the circuit or system. This is particularly so within the microelectronics (semiconductor) are...

This paper describes an analogue EHW (Evolvable Hardware) chip for Intermediate Frequency (IF) lters, which are widely used in cellular phones. When analogue Integrated Circuits (ICs) and LargeScale Integrated Circuits (LSIs) are manufactured, the values of the analogue circuit components, such as resistors or capacitors, often vary from the precise design speci cations. Analogue LSIs with such...

We describe a hierarchical structure for a knowledge-based analog circuit synthesis tool. Analog circuit topologies are represented as a hierarchy of abstract functional blocks each with associated design knowledge. We also describe mechanisms to select from among alternate design styles, and to translate performance specifications from one level in the hierarchy to the next lower level. A prot...

In Analog circuit design field, current reference circuit is mostly used for constant current supply to the circuits, so that their function runs properly. This work gives a circuit that operates with minimum operating voltage and current, CMOS current generator circuit and presents its performance with circuit simulation in 180nm UMC CMOS technology. The designed circuit has four sub parts sta...