A 12 bit 50 MS/s CMOS Nyquist A/D Converter With a Fully Differential Class-AB Switched Op-Amp

作者：Kim Young Ju^*; Choi Hee Cheol; Ahn Gil Cho; Lee Seung Hoon

来源：IEEE Journal of Solid-State Circuits, 2010, 45(3): 620-628.

DOI：10.1109/JSSC.2009.2039534

• Analog-to-digital converter (ADC)
• class-AB
• fully differential
• low power
• sample-and-hold amplifier (SHA)-free
• switched operational amplifier (op-amp)

A 12 bit 50 MS/s 1.8 V pipelined CMOS analog-to-digital converter (ADC) based on a fully differential class-AB switched operational amplifier achieves low power consumption with a differential input voltage of 2.4 Vp-p. A global- loop dynamic common-mode feedback circuit enables fully differential class-AB operation with dynamic current switching for power reduction. The prototype ADC shows a peak signal-to-noise-and-distortion ratio of 64.0 dB and a peak spurious-free dynamic range of 76.6 dB for a 31 MHz input signal at 50 MS/s while the measured differential and integral nonlinearities are within +/- 0.26 LSB and +/- 0.72 LSB, respectively. The prototype ADC in a 0.18 mu m 1P6M CMOS process consumes 18.4 mW at 50 MS/s and 1.8 V occupying an active die area of 0.26 mm(2).

• 出版日期2010-3