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In this paper a 1-GS/s 6-bit flash type analog-to-digital converter (ADC) is designed in 0.18-mum one-poly six-metal CMOS. An offset calibrating method is used to improve the performance of ADC. To reduce the input capacitance of the ADC and the amount of calibration circuit, the active interpolation technique is applied. Measured results show the ADC achieves a SNDR of 32.5 dB for a 7 MHz input at 1 GS/s, and 25.4 dB for a 108-MHz input. The power consumption is 550 mW at 1 GS/s from a 1.8-V supply.