Title :
Current-mode approaches to implementing hybrid analogue/digital Viterbi decoders
Author :
Demosthenous, Andreas ; Taylor, John
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll. London, UK
Abstract :
The add-compare-select (ACS) unit plays a key role in the complexity and speed of a Viterbi decoder. When this unit is realised using analogue circuit design techniques there is a substantial reduction in the number of transistors required compared to digital realisations. In addition, the use of analogue circuit design techniques can result in faster and less power dissipative Viterbi realisations. This paper describes a CMOS high-speed current-mode ACS circuit for use in R=1/n hybrid analogue/digital Viterbi decoders. Unlike previous analogue ACS designs, our proposed approach uses switched current techniques, and since no MOS capacitors are required, the decoder can be realised using an economical single-poly CMOS process
Keywords :
CMOS integrated circuits; Viterbi decoding; mixed analogue-digital integrated circuits; switched current circuits; CMOS SI circuit; add-compare-select unit; current-mode circuit; hybrid analogue/digital Viterbi decoders; single-poly CMOS process; switched current techniques; CMOS process; Circuit synthesis; Convolution; Convolutional codes; Decoding; Environmental economics; MOS capacitors; Power generation economics; Viterbi algorithm; Working environment noise;
Conference_Titel :
Electronics, Circuits, and Systems, 1996. ICECS '96., Proceedings of the Third IEEE International Conference on
Conference_Location :
Rodos
Print_ISBN :
0-7803-3650-X
DOI :
10.1109/ICECS.1996.582649