Allan Belcher

Signal Conversion, UK


R. Allan Belcher (SM’86) received the B.Sc. degree in electronic engineering from the University of North Wales Bangor, Bangor, U.K., in 1969, and the Ph.D. degree in electronic engineering from the University of Surrey, Guildford, U.K., in 1977. He was a Research Engineer with the BBC Engineering Research Department, London, U.K., from 1969 to 1978, where he produced the patents for the DCF method. He became a Faculty Member with Swansea University, Swansea, U.K., where he originated patents related to digital audio conversion. Since 2005, he has been a Professor of Conversion Technology with Cardiff University, Cardiff, U.K., and has undertaken research into ADC/DAC systems for wide-band wide-dynamic range sensors. Dr. Belcher originated and chaired the IEE series of the international conferences on advanced ADCs, DACs, and their applications, served in the IEEE, British Standards Institution, and IEC Standards Committees related to ADCs, and is the Chairman of the IEC Working Group responsible for IEC 60748-4-3.


Direct Interpolation ADCs and DACs

The Direct Interpolation (DI) architecture for data conversion has been applied with success in specialist circuits and systems but its full potential has not yet been realised as this requires a custom integrated circuit. This talk will outline the method, some of its successful applications, and the circuit design and digital signal processing issues. A figure of merit that includes sample rate, resolution and power is described and supported by surveys of the progression of the state of the art of ADCs and DACs. This survey will be contrasted with the well known one by Walden (in IEEE trans). The likely progression the state of the art will point the way towards applications where the DI method may be used most effectively