Title :
CMOS implementation of an immediately adaptive delta modulator
Author :
Scott, Jeffrey W. ; Lee, Wai L. ; Giancarlo, Charles Henry ; Sodini, Charles G.
fDate :
12/1/1986 12:00:00 AM
Abstract :
The modulator is described at the system level by analyzing the system transfer function, stability, frequency response, and quantization noise. Individual circuit blocks are explained at device level. A comparator design which is based on presenting an amplified signal to a pull-up pull-down latch, commonly used in dynamic RAMs, is described. The immediately adaptive delta modulator (IADM) was fabricated in a 3.5-μm twin-tub CMOS process. An experimentally measured signal-to-noise ratio of 91 dB across the audio band (20 Hz-20 kHz) with a total harmonic distortion of less than 0.17% is reported. These results demonstrate the potential of this topology for 16-bit audio-band A/D conversion.
Keywords :
Analogue-digital conversion; CMOS integrated circuits; Delta modulation; Modulators; Transfer functions; analogue-digital conversion; delta modulation; modulators; transfer functions; Circuit noise; Circuit stability; Delta modulation; Frequency response; Latches; Noise level; Quantization; Signal design; Stability analysis; Transfer functions;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.1986.1052652