Title :
Micro-power 10-bit sigma-delta A/D-converter
Author :
Rapakko, Harri ; Kostamovaara, Juha
Author_Institution :
Dept. of R&D, Nokia Mobile Phones, Oulu, Finland
Abstract :
A 10-bit sigma-delta A/D-converter was designed to study the applicability of the new type of SC-integrator circuit. The new topology utilizes the constant gate-source voltage of a source follower instead of utilizing the virtual short circuit between the input nodes of the operational amplifier. The main benefit of the of integrator circuit is the considerably decreased current consumption and smaller silicon area. The measurement results showed that the main limiting factor of the topology was the low DC-gain, which lead to improper noise shaping. The other properties of the charge transfer based on constant gate-source voltage were promising, especially when used in battery-operated low-power electronics
Keywords :
integrating circuits; sigma-delta modulation; switched capacitor networks; 10 bit; DC-gain; SC-integrator circuit; constant gate-source voltage; current consumption; limiting factor; low-power electronics; noise shaping; sigma-delta A/D-converter; silicon area; source follower; Charge transfer; Circuit topology; Delta-sigma modulation; Integrated circuit measurements; Low power electronics; Noise measurement; Noise shaping; Operational amplifiers; Silicon; Voltage;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704431
