2013 Volume E96.A Issue 12 Pages 2508-2515
This paper presents a 12-bit interpolated pipeline analog to digital converter (ADC) using body voltage controlled amplifier for current biasing and common mode feedback (CMFB). The proposed body voltage control method allows the amplifier to achieve small power consumption and large output swing. The proposed amplifier has a power consumption lower than 15.6mW, almost half of the folded cascode amplifier satisfying 12-bit, 400MS/s ADC operation. Moreover, the proposed amplifier secures 600mV output swing, which is one drain source voltage (VDS) wider compared with the telescopic amplifier. The 12-bit interpolated pipeline ADC using the proposed amplifier is fabricated in a 1P9M 90nm CMOS technology with a 1.2V supply voltage. The ADC achieves an effective number of bit (ENOB) of about 10-bit at 300MS/s and an figure of merit (FoM) of 0.2pJ/conv. when the frequency of the input signal is sufficiently low.
