What is a latched comparator?

The latched comparator is designed with StrongArm latch as the primary decision and amplification stage followed by a latching element to drive the output load. The StrongArm latch is a proven circuit topology suitable for all seasons.

What is a CMOS comparator?

Abstract. In this chapter we shall deal with the design of CMOS comparators. A comparator is the basic component mainly used in analog-to-digital converters. Ideally, it generates an output logic signal as an instant response to the sign of an analog input (voltage or current).

What is comparator sensitivity?

2. Sensitivity is the minimum input voltage that produces a consistent output. The output peak-to-peak swing is in the range of 3-5 V. Therefore, for low speed, in order to detect a 1 mV signal a voltage gain of 5000 is required.

What is the function of the comparator in the ADC?

A comparator is normally used in applications where some varying signal level is compared to a fixed level (usually a voltage reference). Since it is, in effect, a 1-bit analog-to-digital converter (ADC), the comparator is a basic element in all ADCs.

What is a strong arm latch?

Strong Arm latches eliminate the need for a drop rod and are secure and easy to install. These latches have been engineered to keep gates in-line with fences. They are especially good to use when you have different sized gaps between gate panels.

How do you make a comparator?

Then the voltage levels between these two upper and lower reference voltages is called the “window”, hence its name. Using our idea above of a voltage divider network, if we now use three equal value resistors so that R1 = R2 = R3 = R we can create a very simple window comparator circuit as shown.

What is comparator offset?

The input offset voltage of a comparator is the input voltage at which its output changes from one logic level to the other. Random circuit noise can cause the output to change from one logic level to the other, even when the comparator input is held constant.

What is the purpose of comparator?

According the Merriam-Webster dictionary, a comparator is any device that’s primary function is to compare an object against the standard measurement. This is an essential function for manufacturers who must regularly meet product specifications during development.

Are the two types of comparator?

Types of comparators are categorized into several kinds, namely electronic, electrical, optical, mechanical, sigma, pneumatic and digital comparators. Comparators play a vital role in making electrical and electronic projects.

How does a preamplifier latch based comparator work?

Preamplifier implies a cascode structure which stabilizes the output voltage and latch with its regenerative feedback which makes comparison fast along with detection of small difference between the inputs. The design is simulated in 90-nm CMOS technology using Cadence EDA software.

Why are preamplifier based comparators used for low power design?

Preamplifier based comparators are used for low power design and high speed. The preamplifier stage of comparator improves the sensitivity of comparator from noise generated by feedback stage[2].The latch stage senses the small difference between the inputs and Journal of Electronic Systems Volume 6 Number 3 September 201673

Is there a high speed dynamic latch comparator?

In this paper, a dynamic latch comparator is proposed based on differential pair input stages and one cross-coupled stage. Moreover, the proposed comparator is able to provide more high resolution and high speed with low power dissipation than conventional dynamic comparators at low supply voltage.

Why do you need a low offset comparator in an ADC?

Circuit intricacy, speed, low-offset voltage, and resolution are essential factors for high-speed applications like analog-to-digital converters (ADCs). The comparator circuit with preamplifier increases the power dissipation, as it requires higher amount of currents than the latch circuitry.