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This paper describes a 12-bit 40-MS/s and 8-bit 80-MS/s dual-mode low power pipelined analog-to-digital converter (ADC). An improved multiplying digital-to-analog converter is used to provide the dual-mode operation. A pre-charged fast power-on switched operational amplifier is used to reduce the power consumption of the pipelined ADC to 28.98 mW/32.74 mW at 40 MHz/80 MHz sampling rates. The ADC was designed in a 1.8-V 1 P6M 0.18-J.lm CMOS process. Simulations indicate that the ADC exhibits a spurious free dynamic range of 90.24 dB/58.33 dB and signal-to-noise-and-distortion ratio of 73.81 dB/47.85 dB at 40 MHz/80 MHz sampling frequencies for a 19-MHz input sinusoidal signal.