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High-speed low-kickback-noise dynamic comparer and circuit

A dynamic comparator and noise technology, applied in multiple input and output pulse circuits, etc., can solve the problem of large power consumption, and achieve the effect of reducing the working cycle and reducing the reset time

Inactive Publication Date: 2018-04-06
SHANGHAI RES INST OF MICROELECTRONICS SHRIME PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the kickback noise of this comparator is very small, but due to the DC path in the two-stage structure, its power consumption is relatively large

Method used

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  • High-speed low-kickback-noise dynamic comparer and circuit

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Embodiment Construction

[0045] The principle and working process of the high-speed and low kickback noise dynamic comparator of the present invention will be explained in detail below in conjunction with the accompanying drawings.

[0046] A high speed low kickback noise dynamic comparator including:

[0047] The pre-amplification stage is used to receive the positive input voltage and the negative input voltage. In the reset working stage, a small voltage difference is generated at the output of the pre-amplification stage; in the comparison stage, the pre-amplification is controlled by the relative magnitude of the positive input voltage and the negative input voltage. The drop speed of the output voltage of the pre-amplification stage, thereby further amplifying the voltage difference at the output terminal of the pre-amplification stage;

[0048] The current compensation branch for suppressing the kickback noise is used to compensate the current attenuation of the main branch in the pre-amplifica...

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Abstract

The invention discloses a dynamic comparator with high speed and low kick noise, which belongs to the field of analog integrated circuits. Its structure includes: pre-amplification stage, current compensation branch for suppressing kickback noise, positive feedback regeneration stage composed of N-channel transistor and P-channel transistor cross-coupling unit, current between pre-amplification stage and positive feedback regeneration stage A control unit, a reset control unit, an offset calibration unit, and an inverter output driver stage. The two current compensation branches that suppress the kickback noise compensate the current attenuation of the main channel to ensure a constant working current of the input pair tube, thereby suppressing the influence of the kickback noise on the input signal, thereby increasing the size of the input pair tube and reducing offset voltage, increasing the response speed. Compared with the traditional comparator, the invention satisfies the requirement of high speed and low power consumption, and exhibits excellent kickback noise suppression ability.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a dynamic comparator with high speed and low kickback noise. Background technique [0002] Modern analog and digital-analog hybrid integrated circuits are constantly developing towards low power consumption and high performance. As one of the most widely used modules (such as analog-to-digital converters, etc.), the comparator plays a decisive role in the performance of the overall circuit. Comparators need to be designed with trade-offs among many factors such as speed, power consumption, mismatch, and noise, which brings great challenges to circuit designers. [0003] figure 1 Shown is a conventional dual tail current source dynamic comparator. This comparator mainly includes two parts: a differential input pre-amplification stage composed of M5 and M6, and two inverters cross-coupled to form a positive feedback regenerative stage composed of M1, M2, M3 and M4. The output...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/22
CPCH03K5/22
Inventor 赵龙李豹程玉华
Owner SHANGHAI RES INST OF MICROELECTRONICS SHRIME PEKING UNIV
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