An analog-to-digital converter with time-variant window

We present a first order analog-to-digital converter with time-variant window. If a DC input is applied, the converter outputs a binary sequence until the internal state enters into the window. It is clarified analytically that the converter can realize higher resolution and lower error variation with shorter code length than previous converters. We also present a simple implementation method using a continuous-time circuit, where the digital output is represented by an impulse-train.

[1]  Steven B. Bibyk,et al.  A novel decoder for Sigma-Delta modulator providing both high resolution and low latency. , 1999 .

[2]  Mansour A. Aldajani,et al.  SNR performance of an adaptive sigma delta modulator , 2001, ISCAS 2001. The 2001 IEEE International Symposium on Circuits and Systems (Cat. No.01CH37196).

[3]  Mohammed Ismail,et al.  A 5 MHz Nyquist rate continuous-time sigma-delta modulator for wideband wireless communication , 1999, ISCAS'99. Proceedings of the 1999 IEEE International Symposium on Circuits and Systems VLSI (Cat. No.99CH36349).

[4]  Ling Xie-ting.  Noise-Reducing Loop in Multi-bit Modulator , 2001 .

[5]  Leon O. Chua,et al.  The effect of integrator leak in Sigma - Delta modulation , 1991 .

[6]  L. O. Chua,et al.  The effect of integrator leak in Σ-Δ modulation , 1991 .

[7]  Haiming Tang,et al.  Time-referenced single-path multi-bit /spl Delta//spl Sigma/ ADC using a VCO-based quantizer , 2000 .

[8]  Hiroyuki Torikai,et al.  Resonance phenomenon of interspike intervals from a spiking oscillator with two periodic inputs , 2001 .

[9]  Ravindranath Naiknaware,et al.  Time-referenced single-path multi-bit Sigma-Delta ADC using a VCO based quantizer. , 1999 .

[10]  Ronan Farrell,et al.  Bounding the integrator outputs of second-order sigma-delta modulators , 1998 .

[11]  Toshimichi Saito,et al.  A dependent switched capacitor A/D converter for Farey series approximation , 2000, 2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353).