Title :
Implementation of an asynchronous current-mode ADC with adaptive quantization
Author :
Virtanen, Kati ; Pänkäälä, Mikko ; Laiho, Mika ; Paasio, Ari
Author_Institution :
Dept. of Inf. Technol., Turku Univ.
Abstract :
This paper presents the measurement results for an analog to digital converter (ADC), which is targeted to operate especially in a video encoding system. It is designed to convert the dc coefficients of a current-mode discrete cosine transform into digital form. The converter is able to change its quantization factor adaptively, fulfilling the demands of several video compression standards. The maximum conversion resolution is 7frac12 bits. The measurements verify correct operation of the converter in terms of input-output behaviour and adaptivity of the quantization
Keywords :
analogue-digital conversion; asynchronous circuits; current-mode circuits; discrete cosine transforms; quantisation (signal); video coding; adaptive quantization; asynchronous current-mode analog-to-digital converter; discrete cosine transform; video encoding system; Analog-digital conversion; Bit rate; Circuits; Discrete cosine transforms; Encoding; Energy consumption; Image converters; Image quality; Quantization; Video compression;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1692886
