Delta-Sigma Converters Using Frequency-Modulated Intermediate Values

Abstract— This paper describes a new first and secondorder delta-sigma modulator (DSM) concept where the first integrator is extracted and implemented by a FM oscillator with the modulating signal as the input. The result is a simple DSM with no need for DACs, allowing straightforward multi-bit quantization. Without the FM oscillator, the modulator becomes a F/D converter with delta-sigma noise shaping. I. INTRODUC TIO N The delta-sigma (1-6) A/D conversion technique [1] is currently receiving increased attention as an attractive alternative to traditional A/D conversion. Although the DSM is well suited for VLSI implementation, multi-bit quantization is not straightforward due to DAC limitations, and the sampling speed is limited by the integrator slew-rate. By implementing the main integrator as a FM oscillator we achieve a simpler modulator without DACs, and straightforward multi-bit quantization and higher sampling frequency potential is one amongst other features. The new DSM t...

• Type: Conference
• Year: 1995
• Where: ISCAS
• Authors: Mats Erling Høvin, Alf Olsen, Tor Sverre Lande, Chris Toumazou
• Keywords: FM Oscillator, Hardware, ISCAS 1995, Multi-bit Quantization, Straightforward Multi-bit Quantization