Title :
A 15 b 30 kHz bandpass sigma-delta modulator
Author :
Longo, L. ; Horng, B.-R.
Author_Institution :
Rockwell Int. Corp., Newport Beach, CA, USA
Abstract :
The authors introduce a bandpass architecture and implementation that achieves 15-b dynamic range over a 30-kHz bandwidth centered at 1.8 MHz using 7.2-MHz sampling frequency and operating on a single 5-V supply. A z-domain representation of the fourth-order bandpass modulator is shown. It is made up of bandpass filters with infinite Qs as opposed to integrators used in lowpass modulators. A/D (analog-to-digital) converter performance is evaluated by applying a 1.8-MHz sinewave, windowing the one-bit digital output with a Dolph-Chebyshev window, and performing a 65536-point FFT (fast Fourier transform).<>
Keywords :
active filters; analogue-digital conversion; band-pass filters; delta modulation; modulators; 1.8 MHz; 15 bit dynamic range; 30 kHz; 5 V; 7.2 MHz; ADC; Dolph-Chebyshev window; FFT; bandpass architecture; fast Fourier transform; fourth-order bandpass modulator; sigma-delta modulator; z-domain representation; Band pass filters; Bandwidth; Capacitors; Circuit noise; Delta-sigma modulation; Dynamic range; Filtering theory; Frequency; Photonic band gap; Sampling methods;
Conference_Titel :
Solid-State Circuits Conference, 1993. Digest of Technical Papers. 40th ISSCC., 1993 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0987-1
DOI :
10.1109/ISSCC.1993.280038
