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A 1-V 1.25-GS/S 8-Bit Self-Calibrated Flash ADC in 90-nm Digital CMOS

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2 Author(s)
Hairong Yu ; Dept. of Electr. Eng., California Univ., Los Angeles, CA ; Chang, M.-C.F.

We present an 8-bit 1.25-GS/s flash analog-to-digital converter (ADC) in 90-nm digital CMOS with wide analog input bandwidth and low power dissipation. The ADC employs two key techniques: a self-biased track-and-hold amplifier which enhances the ADC full-scale voltage and enables the converter operating under a single 1-V supply; and an improved calibration scheme based on reference pre-distortion to enhance the ADC linearity without sacrificing its sampling speed. The prototype converter thus achieves 7-, 6.9-, 6.5-bit ENOB at 1.25 GS/s for input signal frequencies of 10 MHz, 600 MHz, and 1.3 GHz, respectively, and better than 52-dB SFDR across the full Nyquist-band, while dissipating 207 mW from a single 1-V supply.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:55 ,  Issue: 7 )