Comparator applications

About: Comparator applications is a research topic. Over the lifetime, 2518 publications have been published within this topic receiving 26639 citations.

Robust high-accuracy high-speed continuous-time CMOS current comparator

Abstract: The authors present a CMOS current comparator which employs nonlinear negative feedback to obtain high-accuracy (down to 1.5 pA) and high-speed for low input currents (8 ns at 50 nA). The new structure features a speed improvement of more than two orders of magnitude for a 1 nA input current, when compared to the fastest reported to date.

Servo loop for well bias voltage source

Abstract: A servo loop for a charge pump including comparator. A variable resistor and comparator are in series and couple the output of the charge pump to an enable input. A current source/sink coupled to the variable resistor provide a first input voltage to the comparator, with the second input of the comparator being coupled to ground or Vdd. A shunt circuit in parallel with the load at the output of the charge pump is also coupled to the output of the comparator. The charge pump and shunt are alternately enabled and disabled by the comparator to maintain a body-bias supply voltage. The servo loop may be configured to provide body-bias for NFETs or PFETs.

A high-accuracy high-speed CMOS current comparator

Abstract: A high-accuracy high-speed current comparator is presented which has well-controlled input resistance and bias currents. Moreover, compared to previous high-speed solutions, it has an accuracy five times better with a lower power consumption. >

Analog-to-digital converter circuit

Abstract: An analog-to-digital converter circuit, such as a flash-type A/D converter, has a plurality of voltage comparators. Each voltage comparator has first and second input terminals and an output terminal. The voltage comparators are arranged in order of reference voltages V ref1 , V ref2 , V ref3 , V ref4 , and V ref5 supplied to the respective second input terminals of the voltage comparators. Each voltage comparator is connected to the adjacent voltage comparator and the adjacent voltage comparator but one via a first resistor and a second resistor, respectively. The presence of the second resistors makes it possible to improve the degree of contributions of the voltage comparators positioned farther away from the center comparator. Accordingly, conversion deviations are reduced when the outputs of the respective comparators are added and averaged, thereby enhancing conversion precision. As a consequence, the voltage comparators are improved in comparison precision and comparison speed.