An LDO-based supply referencing 10b 32MS/s pipelined ADC

Abstract

A reference driver-free pipelined ADC with a low drop-out (LDO) regulator for power supply is proposed for SoC applications. An LDO-based regulated voltage provides not only power supply for digital and analog circuits but also works as a reference voltage for the ADC. Conventional residue function from a 2.5b/stage design can use its max input as much as 93% of the internal supply voltage. A prototype 10-bit 32MS/s ADC has been designed for a 0.18µm CMOS technology. Under a regulated 1.5V internal supply from an external 1.8V, the design shows 65.1dB SFDR with 7.06mA (including LDO) current consumption.