Title :
A fourth-order bandpass ΣΔ modulator using current-mode analog/digital circuits
Author :
de la Rosa, J.M. ; Perez-Verd, B. ; Medeiro, F. ; Vazquez, Rodriguez A.
Author_Institution :
Dept. of Analog Design, Centro Nacional de Microelectron., Sevilla, Spain
Abstract :
We present a fourth-order bandpass ΣΔ switched-current modulator IC in 0.8 μm CMOS single-poly technology. Its architecture is obtained by applying a lowpass to bandpass transformation (z-1 →-z-2) to a second-order lowpass modulator. It has been realized using fully-differential circuitry with common-mode feedback. Measurements show 8 bit dynamic range up to 5 MHz clock frequency and 10 KHz bandwidth
Keywords :
CMOS integrated circuits; current conveyors; digital-analogue conversion; integrated circuit noise; mixed analogue-digital integrated circuits; modulators; quantisation (signal); sigma-delta modulation; switched current circuits; thermal noise; 0.8 micron; 5 MHz; 8 bit; CMOS single-poly technology; common-mode feedback; current-mode analog/digital circuits; folded-cascode integrator; fourth-order bandpass ΣΔ modulator; fully-differential circuitry; input buffer; lowpass to bandpass transformation; mixed signal chips; quantisation noise; second-order lowpass modulator; switched-current modulator IC; thermal noise; BiCMOS integrated circuits; Cost function; Degradation; Delta modulation; Design methodology; Digital circuits; Digital modulation; Feedback; Frequency; Quantization;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1996. IMTC-96. Conference Proceedings. Quality Measurements: The Indispensable Bridge between Theory and Reality., IEEE
Conference_Location :
Brussels
Print_ISBN :
0-7803-3312-8
DOI :
10.1109/IMTC.1996.507551
