Title :
An 8 b CMOS vector A/D converter
Author :
Tuttle, G.T. ; Fallahi, S. ; Abidi, A.A.
Author_Institution :
California Univ., Los Angeles, CA, USA
Abstract :
A vector A/D (analog-to-digital) converter is described. The IC stores a codebook of vectors on-chip, accepts a 16-element analog vector at the input, and calculates the Euclidean distance between the input and all codevectors (referred to as global search) to produce an 8-b code indexing the codevector closest to the input prompt. At 5-MHz clock rate, the chip dissipates less than 50 mW quantizing a new 16-element analog vector every 10 clock periods, which means that it can encode an entire 512*512 pixel gray-scale image in 4*4 blocks at 30-Hz frame rate.<>
Keywords :
CMOS integrated circuits; analogue-digital conversion; 262144 pixels; 30 Hz; 5 MHz; 50 mW; 512 pixels; 8 bit resolution; CMOS; gray-scale image; onchip vector codebook storage; vector A/D converter; vector ADC; Binary trees; Clocks; Diodes; Euclidean distance; Image coding; Indexing; MOSFET circuits; Signal processing; Switches; Threshold voltage;
Conference_Titel :
Solid-State Circuits Conference, 1993. Digest of Technical Papers. 40th ISSCC., 1993 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0987-1
DOI :
10.1109/ISSCC.1993.280093
