Title :
A Single-Chip ADM LSI CODEC
Author :
Irie, Kazunari ; Uno, Takehiko ; Uchimura, Kuniharu ; Iwata, Atsushi
Abstract :
This paper describes the circuit design of an ADM (adaptive delta modulation) LSI CODEC with filters. The LSI chip is mounted in a 16-pin DIP and can operate with single low voltage supply. In order to realize a low power dissipation LSI IC, switched capacitor technology was used in the design of input/output filters and integrators, and C-array D/A converters and low voltage analog circuits were developed. An operational amplifier with a complementary differential input stage and a comparator with a capacitor-coupled input stage were employed to obtain a wide input voltage range with a low voltage supply. This CODEC achieves speech quality higher than that of 6-bit µ-law PCM CODEC at 32 kbits/s and power dissipation of below 30 mW.
Keywords :
Codecs; Data communication equipment; Delta modulation; Field effect integrated circuits; Large scale integration; Signal processing; Adaptive filters; Analog integrated circuits; Circuit synthesis; Codecs; Delta modulation; Electronics packaging; Large scale integration; Low voltage; Power dissipation; Switching circuits;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.1983.1051896
