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A 1-V, 8-bit pipelined ADC is realized using multi-phase switched-opamp (SO) technique. A novel loading-free architecture is proposed to reduce the capacitive loading and to improve the speed in low-voltage SO circuits. Employing the proposed loading-free pipelined ADC architecture together with double-sampling technique and a fast-wake-up dual-input-dual-output switchable opamp, the ADC achieves 100-MS/s conversion rate, which to our knowledge is the fastest ADC ever reported at 1-V supply using SO technique, with performance comparable to that of many high-voltage switched-capacitor (SC) ADCs. Implemented in a 0.18-m CMOS process, the ADC obtains a peak SNR of 45.2 dB, SNDR of 41.5 dB, and SFDR of 52.6 dB. Measured DNL and INL are 0.5 LSB and 1.1 LSB, respectively. The chip dissipates only 30 mW from a 1-V supply.

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