A cyclic A/D converter that does not require ratio-matched components
- 1 February 1988
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Solid-State Circuits
- Vol. 23 (1) , 152-158
- https://doi.org/10.1109/4.272
Abstract
The circuit configuration of a cyclic analog-to-digital (A/D) converter using switched-capacitor techniques is described. The analog portion of the circuit consists of two operational amplifiers, four capacitors, and ten switches regardless of the number of bits per sample converted, and completes an n-bit conversion in 3n clock cycles. The conversion characteristics are inherently insensitive both to capacitor ratio and to amplifier offset voltage. The circuit, therefore, can be realized in a small die area. The effects of finite amplifier gain and switch charge injection on the conversion accuracy are discussed. A prototype chip has been fabricated in a 2- mu m CMOS technology operating on a single 5-V supply. When it is operated as an 8-bit converter at a sampling rate of 8 kHz, the maximum conversion error is 0.2 LSB (least-significant bit) for differential nonlinearity and 0.5 LSB for integral nonlinearity. The die area measures 0.79 mm/sup 2/.<>Keywords
This publication has 8 references indexed in Scilit:
- Reference refreshing cyclic analog-to-digital and digital-to-analog convertersIEEE Journal of Solid-State Circuits, 1986
- MOS ADC-filter combination that does not require precision analog componentsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1985
- A ratio-independent algorithmic analog-to-digital conversion techniqueIEEE Journal of Solid-State Circuits, 1984
- Switch-induced error voltage on a switched capacitorIEEE Journal of Solid-State Circuits, 1984
- A Voiceband Codec with Digital FilteringIEEE Transactions on Communications, 1981
- Class AB CMOS amplifier micropower SC filtersElectronics Letters, 1981
- An algorithmic analog-to-digital converterPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1977
- All-MOS charge-redistribution analog-to-digital conversion techniques. IIIEEE Journal of Solid-State Circuits, 1975