Parametric amplifier based dynamic clocked comparator

•The paper describes the working principle of various DTPAs.•The DTPA has been used as a preamplifier stage of a dynamic latch comparator.•The microchip has been designed and fabricated in a 32 nm technology.•The experimental results of the chip evaluate the proposed technique.•The consistent performance for process, voltage and temperature corners.

The dynamic clocked comparator using a parametric amplifier is proposed and designed using a concept of the charge transfer amplification (CTA). A low gain (5 V/V) reverse discrete-time parametric amplifier (RDTPA) was used as a pre-amplifier stage of the proposed comparator. The level shifter scheme to nullify an input common-mode voltage (VCMIVCMI) shows minimal deviation for varying process corners. The complete design including the latch and the RDTPA is designed and fabricated in an STMicroelectronics 32 nm CMOS technology with the supply voltage of 1 V and a sampling frequency of 50 MHz. The fabricated chip results show 7 mV of an input offset voltage, 120 μW of power consumption and 2.4 pJ of energy per comparison.