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Differential amplification circuit and assembly line analog to digital converter (ADC) with differential amplification circuit

A differential amplifier circuit and analog-to-digital conversion technology, which is applied in the direction of analog-to-digital converters, differential amplifiers, improved amplifiers to reduce temperature/power supply voltage changes, etc., can solve problems such as poor linearity of dynamic operational amplifiers, and achieve the goal of improving linearity Effect

Active Publication Date: 2015-11-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the voltage change process of X and Y points, the NMOS tube M 1 and M 2 The transconductance contributes a large nonlinearity, which leads to poor linearity of the dynamic op amp

Method used

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  • Differential amplification circuit and assembly line analog to digital converter (ADC) with differential amplification circuit
  • Differential amplification circuit and assembly line analog to digital converter (ADC) with differential amplification circuit
  • Differential amplification circuit and assembly line analog to digital converter (ADC) with differential amplification circuit

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Embodiment Construction

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0050] With respect to the problem of poor linearity of the existing dynamic operational amplifier, an embodiment of the present invention provides a differential amplifier circuit and a pipelined analog-to-digital converter using the differential amplifier circuit, the differential amplifier circuit includes a super source follower, the super...

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Abstract

The invention provides a differential amplification circuit and an assembly line ADC with the differential amplification circuit. The differential amplification circuit comprises super-source followers, output voltage of each super-source follower is strictly equivalent to input voltage of the same, low output resistance can be realized, the capability that the output voltage follows the input voltage is improved, the output voltage is converted into current via resistors, the voltage and temperature coefficients of theresistors are both very low, namely, the linearity of theresistors is higher, and thus, the linearity of the differential amplification circuit is improved.

Description

technical field [0001] Embodiments of the present invention relate to semiconductor technology, and in particular to a differential amplifier circuit and a pipelined analog-to-digital converter (Analog-Digital Converter, ADC for short) using the differential amplifier circuit. Background technique [0002] ADCs based on base station and video applications, such as pipeline ADCs, have relatively high requirements for speed. In the pipeline ADC, the analog-to-digital conversion time includes sampling time, sub-analog-to-digital conversion time and operational amplifier (referred to as: operational amplifier) ​​amplification time. For the amplification time of the op amp, the response of the traditional closed-loop op amp to the input signal is an exponential response with a base less than 1, while the response of the dynamic op amp to the input signal is a linear response, that is, the input signal is amplified by the same multiple, and the dynamic Op amps take less time than...

Claims

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Application Information

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IPC IPC(8): H03M1/12H03F3/45H03F1/32H03F1/30
Inventor 杨金达周立人
Owner HUAWEI TECH CO LTD
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