Gain enhanced full-differential amplifier structure for pipeline ADC

A fully differential amplifier and enhanced technology, which is applied in the direction of differential amplifiers, DC coupled DC amplifiers, amplifiers, etc., can solve the problems of cost increase, laser correction increase, etc., and achieve the effect of stable grid voltage and high gain

Active Publication Date: 2017-02-22
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Laser correction needs to add additional processes, and the cost is greatly increased; self-calibration circuits need to design new algorithms and implement circuits, which brings huge pressure on design difficulty, power consumption and area; capacitance averaging technology actually sacrifices speed to improve accuracy

Method used

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  • Gain enhanced full-differential amplifier structure for pipeline ADC
  • Gain enhanced full-differential amplifier structure for pipeline ADC
  • Gain enhanced full-differential amplifier structure for pipeline ADC

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Embodiment Construction

[0018] The present invention will be further described in detail below in combination with specific embodiments.

[0019] like figure 1As shown, the present invention is a gain-enhanced full differential amplifier structure for pipeline ADC, including MDAC main amplifier and two auxiliary amplifiers, the MDAC main amplifier is a two-stage amplifier, including 9 PMOS transistors and 10 NMOS transistors , a telescopic cascode amplifier is used as the first stage, and a common source amplifier is used as the second stage output stage. The output impedance Rp of the cascode structure composed of 2 PMOS transistors and 2 NMOS transistors The output impedance Rn of the formed cascode structure is the output impedance of the first stage; the two auxiliary amplifiers are composed of op amp AMP1 and op amp AMP2, through the op amp AMP1 and op amp AMP2, the first stage output impedance Rp and Rn are respectively Increase to AP*Rp and AN*Rn, wherein, AP and AN are the gain of operationa...

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Abstract

The invention discloses a gain enhanced full-differential amplifier structure for a pipeline ADC. The structure comprises an MDAC (Multiplying Digital to Analog Converter) master amplifier and two secondary amplifiers. The master amplifier is a telescopic cascode structure. Two PMOS transistors form output impedance Rp of the cascode structure. Two NMOS transistor form the output impedance Rn of the cascode structure. The two secondary amplifiers of an operational amplifier AMP1 and the operational amplifier AMP2 are used for improving the Rp and the Rn. The two secondary amplifiers comprise output voltage stabilizing structures which are used for ensuring the gate voltage stability of the common gate PMOS transistors and the common gate NMOS transistors in the operational amplifier of the full-differential master amplifier. The operational amplifier AMP1 is a two-level operational amplifier. A current input mode is taken as an input mode of a second-level amplifier. The load of a first level-amplifier is reduced. The bandwidth and gain are increased. The gain of the master amplifier is increased from original Gm1*(Rp||Rn)*A2 to Gm1*(AP*Rp||AN*Rn)*A2.

Description

technical field [0001] The invention relates to the field of analog integrated circuits, in particular to a gain-enhanced full-differential amplifier that can be used in pipeline analog-to-digital converter circuits. Background technique [0002] In recent years, with the rapid development of communication and digital signal processing technology, the design of high-speed and high-precision analog-to-digital converters is becoming more and more important as the interface between analog systems and digital systems. As a classic structure, the pipeline analog-to-digital converter can well take into account the requirements of speed, precision and power consumption. Because of its structural design diversity and flexibility, it has been greatly favored. [0003] The basic idea of ​​the pipeline ADC is to disperse the overall precision to all levels of the pipeline, and combine the output of each level through timing control to achieve the overall required precision of the syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03M1/06H03M1/12
CPCH03F3/45183H03M1/0607H03M1/129
Inventor 赵毅强赵公元叶茂辛睿山高曼
Owner TIANJIN UNIV
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