High speed comparator

A high-speed comparator, combined technology, used in instruments, multiple input and output pulse circuits, analog/digital conversion and other directions, can solve the problems of low working speed and unstable transmission delay, and achieve stable transmission delay, Overcome the effect of unstable transmission delay and fast response

Active Publication Date: 2012-05-23
CHONGQING GIGACHIP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0011] In order to overcome the problems of low working speed and unstable transmission delay of traditional comparators, the present invention provides a high-speed comparator for high-speed and high-precision pipeline A / D converters, and the circuit structure of the present invention is simple and easy to use

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Embodiment Construction

[0028] The specific implementation manners of the present invention are not limited to the following description, and are now further described in conjunction with the accompanying drawings.

[0029] The circuit diagram of a high-speed comparator embodied in the present invention is as image 3shown. It consists of a preamplifier unit, an emitter follower unit and a latch unit. The preamplifier unit includes: PMOS tube MP 1 , PMOS tube MP 2 , NMOS tube MN 1 , NMOS tube MN 2 , NMOS tube MN 3 , this preamplifier unit is used to obtain higher resolution while reducing the kickback effect of the latch. The emitter follower unit includes: PMOS tube MP 3 , NMOS tube MN 4 , NMOS tube MN 5 , NMOS tube MN 6 , NMOS tube MN 7 , this emitter follower unit further reduces the kickback effect of the latch. The latch unit includes: PMOS tube MP 4 , PMOS tube MP 5 , Inverter INV 1 , Inverter INV 2 , NMOS tube MN 8 , NMOS tube MN 9 , NMOS tube MN 10 , NMOS tube MN 11 , the ...

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Abstract

The invention relates to a high speed comparator, which comprises a preamplifier unit, an emitter follower unit and a latch unit. In the circuit of the invention, one emitter follower unit is arranged between the preamplifier unit and the latch unit of the traditional comparator to play a buffer role so that the input voltage needed by the latch unit can reach in a short time and the work speed of the comparator is improved. The circuit of the invention has the advantages of high speed and stable transmission delay, effectively overcomes the defects of the low speed and unstable transmission delay of the traditional comparator and can be extensively applied to the A / D conversion field of high speed and high precision.

Description

technical field [0001] The invention relates to a high-speed comparator, in particular to a high-speed comparator used for a high-speed and high-precision pipeline A / D converter. Its direct application field is high-speed and high-precision pipeline A / D converter. Background technique [0002] In recent years, with the development of the pipeline A / D converter towards high speed and high precision, the requirements for its internal sub-circuits, especially the comparator, are getting higher and higher. In the pipeline A / D converter, the internal comparator needs to amplify the analog small signal voltage of this stage to the logic level required by the subsequent circuit, and the result latched by the comparator should be sent to the MDAC module for subtraction with the analog input of this stage operation. Usually the propagation delay of the comparator takes up the time available for the settling of the op amp in the MDAC module, limiting the speed of the entire pipeline...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/24H03M1/34
Inventor 黄兴发李梁张正平沈小峰陈良李儒章陈光炳
Owner CHONGQING GIGACHIP TECH CO LTD
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