Title :
A 125MS/s self-latch low-power comparator in 0.35μm CMOS process
Author :
Rezaeii, Ali Baradaran ; Hasseli, Leila ; Moradi, Tohid
Author_Institution :
Urmia Grad. Inst., Urmia, Iran
Abstract :
A 125 MS/s self-latch low-power comparator in 0.35 μm CMOS process is presented. This structure is a rail-to-rail folded-cascode amplifier and a positive feedback connection of two back-to-back inverters in which only reset switches are used for controlling. A limited time is not allocated for the evaluation phase and instead the latch sequence starts itself, only after the evaluated voltage reaches to a desired level. Having sufficient time for producing the necessary evaluated voltage, of course in correct direction, guaranties the validity of the comparator operation; it means higher accuracy. Controlling the comparator is easy due to the special structure(using less controlling switches) and the layout is very compact with die size of about 34*14(μm)2. The comparator has been examined in all situations such as different corners, power supply noise of 300 m Vp-p and input voltage range of 1.6 Vp-p with 1 mV accuracy. The total power consumption of the comparator and corresponding readout circuitry is only 300 μW. The results show that the kick-back noise and the clock feed-through are reduced as well.
Keywords :
CMOS analogue integrated circuits; amplifiers; comparators (circuits); flip-flops; integrated circuit noise; invertors; power consumption; power supply circuits; CMOS process; back-to-back inverters; clock feed-through; comparator operation; controlling switches; evaluated voltage; evaluation phase; input voltage range; kick-back noise; latch sequence; positive feedback connection; power consumption; power supply noise; rail-to-rail folded-cascode amplifier; readout circuitry; reset switches; self-latch low-power comparator; size 0.35 mum; Accuracy; Clocks; Control systems; Inverters; Latches; Noise; Threshold voltage; Comparator; high resolution; low power; self-latching;
Conference_Titel :
Electrical Engineering (ICEE), 2013 21st Iranian Conference on
Conference_Location :
Mashhad
DOI :
10.1109/IranianCEE.2013.6599865