Photon-counting x-ray detectors with pulse-height analysis provide spectral information that may improve material decomposition and contrast-to-noise ratio (CNR) in CT images. The number of energy measurements that can be acquired simultaneously on a detector pixel is equal to the number of comparator channels. Some spectral CT designs have a limited number of comparator channels, due to the co...

An analog comparator is one of the core units in all-optical analog-to-digital conversion (AO-ADC) systems, which digitizes different amplitude levels into two levels of logical '1' or '0' by comparing with a defined decision threshold. Although various outstanding photonic ADC approaches have been reported, almost all of them necessitate an electrical comparator to carry out this binarization....

Comparator-based switched-capacitor (CBSC) circuits were introduced in [1] as an alternative to opamp-based designs to overcome the limitations of opamps due to device and voltage scaling. Reduced device gain and signal swing make it increasingly difficult to design high-gain high-speed feedback loops with opamps. CBSC circuits replace the opamp with a comparator and a current source (see U1 an...

Low-voltage low-power comparators implemented in standard digital processes are of increasing importance in different integrated applications. In this paper a 1-V fully-differential lowpower MOSFET-only comparator with rail-to-rail input swing is presented which can be suitably used in very low-voltage lowpower pipelined A/D converters. This comparator utilizes a resistive divider configuration...

the fast growing electronics industry is pushing towards high speed low power analog to digital converters. Comparator is electronic devices which are mainly used in Analog to Digital converter (ADC). In ADC they are used for quantization process, and are mainly responsible for the delay produced and power consumed by an ADC. A high speed low power comparator is required to satisfy the future d...

Current comparator is a fundamental component of current-mode analog integrated circuits. A novel high-performance continuous-time CMOS current comparator is proposed in this paper, which comprises one CMOS complementary amplifier, two resistive-load amplifiers and two CMOS inverters. A MOS resistor is used as the CMOS complementary amplifier’s negative feedback. Because the voltage swings of t...

The need for ultra low-power, area efficient and high speed analog-to-digital converters is pushing toward the use of dynamic regenerative comparators to maximize speed and power efficiency. The objective of this paper is to design and implementation of delay efficient and low power consumption double-tail dynamic comparator in successive approximation analog to digital convertor. The conventio...

The accuracy of measuring the crossing moment of a given signal to a specific reference voltage plays a crucial role in determining the bandwidth of the signal that could be converted by a level-crossing ADC. This timing accuracy is mainly determined by delay dispersion of the comparator and the accuracy of the time-to-digital converter (TDC) comprising the levelcrossing ADC. With the pico-seco...