JSSC 2011第8期Other0.18μm CMOS

A 5-MHz 11-Bit Self-Oscillating 61Modulator With a Delay-Based Phase Shifter in

该论文提出了一种5MHz带宽、11位精度的自振荡ΔΣ调制器，采用基于延迟的相位偏移器设计。

5MHz带宽, 11位精度, 850MHz时钟频率, 66dB动态范围, 6mW功耗

自振荡ΔΣ调制器脉宽调制数字延迟FIRDAC

▸自振荡ΔΣ调制器结合噪声整形与脉宽调制

▸通过数字延迟精确控制自振荡

▸反馈FIRDAC降低抖动敏感度

Abstract

Abstract—Self-oscillating /6/1 modulators are a class of /6/1 modulators that combines noise shaping with pulsewidth modula- tion (PWM). Moreover , in such a modulator , the PWM carrier is generated by a self-oscillation mode that is deliberately introduced. In our approach, this self-oscillation is accurately controlled by a digital delay in the feedback loop. The concept is elaborated for a second-order self-oscillating /6/1modulator with 5-MHz bandwidth. Here, the clock frequency equals 850