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Pre-amplifying latch comparator with low detuning

A comparator and preamplifier technology, applied in the field of comparators, can solve the problems of no latch offset calibration, limiting comparator speed, etc., to achieve the effect of improving accuracy and reducing offset

Inactive Publication Date: 2014-04-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method limits the speed of the comparator and only calibrates the offset of the pre-amplifier, not the offset calibration of the latch

Method used

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  • Pre-amplifying latch comparator with low detuning
  • Pre-amplifying latch comparator with low detuning
  • Pre-amplifying latch comparator with low detuning

Examples

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Such as figure 1 Shown is a low-offset pre-amplification latch comparator, including a basic pre-amplification latch comparator 1, an offset compensation pair tube 2, an offset calibration switch 3, and an offset calibration control circuit 4. The basic pre-amplification latch comparator The device 1 includes a pre-amplifier of the first stage and a latch of the second stage. The offset compensation pair tube 2 includes an offset adjustment tube, and the offset adjustment tube is connected in parallel to the output terminal of the pre-amplifier as a carrier for comparator offset compensation. , adjust the offset voltage of the comparator by changing the grid voltage of the offset adjustment tube; the offset calibration switch 3 is used as an enable switch for whether the offset calibration control circuit 4 performs offset calibration operation; the offset calib...

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Abstract

The invention discloses a pre-amplifying latch comparator with low detuning. The pre-amplifying latch comparator with the low detuning comprises a base pre-amplifying latch comparator, a detuning compensation geminate transistor, a detuning calibration switch and a detuning calibration control circuit. The base pre-amplifying latch comparator comprises a primary pre-amplifier and a secondary latch. The detuning compensation geminate transistor comprises a detuning adjusting transistor, the detuning adjusting transistor is connected to the output end of the pre-amplifier in parallel, and the detuning voltage of the whole comparator is regulated by changing a grid voltage of the detuning adjusting transistor. A digital bidirectional shifter is adopted by the detuning calibration control circuit to store detuning information and control the detuning calibration control circuit to carry out detuning calibration. According to the pre-amplifying latch comparator with the low detuning, the detuning calibration control circuit based on digital storage and control is added based on an existing pre-amplifying latch comparator, the detuning of the pre-amplifying latch comparator can be reduced to one nth of original detuning, and the pre-amplifying latch comparator after calibration reduces the detuning greatly.

Description

technical field [0001] The invention relates to a low offset pre-amplification latch comparator, which belongs to the comparator technology. Background technique [0002] The comparator converts the input analog signal into a digital signal, which is an important interface from analog to digital, and is widely used in circuits such as analog-to-digital converters and digital-to-analog converters. Among them, the pre-amplified latch comparator can amplify the input analog signal, isolate the influence of the output digital on the input signal, and the fast comparison latch of the latch. Compared with the amplifier-type comparator with high precision and slow speed, it can be very good Take advantage of the speed of the latch comparator and improve the accuracy to a certain extent. Therefore, the pre-amplified latch comparator is widely used in practical engineering practice. However, with the rapid development of digital circuits, the speed and precision requirements of ana...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/22
Inventor 吴建辉林志伦李红汤旭婷薛金伟田茜
Owner SOUTHEAST UNIV
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