A selectable-bandwidth 3.5 mW, 0.03 mm(2) self-oscillating Sigma Delta modulator with 71 dB dynamic range at 5 MHz and 65 dB at 10 MHz bandwidth

作者：Woestyn Pierre; Rombouts Pieter^*; Xing Xinpeng; Gielen Georges

来源：Analog Integrated Circuits and Signal Processing, 2012, 72(1): 55-63.

DOI：10.1007/s10470-012-9835-6

• A/D conversion
• Pulsewidth modulation
• Self-oscillation
• Continuous time sigma delta modulation

In this paper we present a dual-mode thirdorder continuous time Sigma A modulator that combines noiseshaping and pulse-width-modulation (PWM). In our 0.18 1,1m CMOS prototype chip the clock frequency equals 1 GHz, but the PWM carrier is only around 125 MHz. By adjusting the loop filter, the ADC bandwidth can be set to 5 or 10 MHz. In the 5 MHz mode the peak SNDR equals 64 dB and the dynamic range 71 dB. In the 10 MHz mode the peak SNDR equals 58 dB and the DR 65 dB. This performance is achieved at an attractively low silicon area of 0.03 mm2 and a power consumption of 3.5 mW.

• 出版日期2012-7