A 2.85mW 0.12mm2 1.0V 11-bit 20-MS/s algorithmic ADC in 65nm CMOS

Abstract

An 11-bit 20-MS/s algorithmic analog-to-digital converter (ADC) based on a dynamic biasing technique is proposed. A dynamic biasing technique is employed to an operational transconductance amplifier (OTA) for power reduction in sub-conversion stages. Besides, a distinct sampling clock scheme is taken to pre-amplifier for reducing aperture time errors. The prototype ADC is fabricated in a 65nm 1P6M CMOS process and features a maximum signal-to-noise-ratio and a spurious-free-dynamic-range of 60.4dB, and 69.2dB at Nyquist input frequency with 20MS/s from a 1.0V supply, respectively. About 22% of OTA power dissipation is reduced without performance degradation and totally 2.85mW is consumed.