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High-speed low-power consumption large-swing operational amplifier for analog-digital converter of production line

A technology for analog-to-digital converters and operational amplifiers, which can be used in analog-to-digital converters, DC-coupled DC amplifiers, differential amplifiers, etc., and can solve problems such as high power consumption of operational amplifiers

Active Publication Date: 2010-11-24
FUDAN UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of low power consumption large-swing operational amplifier for pipeline analog-to-digital converter, to overcome the problem of high power consumption of the existing operational amplifier used in high-speed analog-to-digital converter

Method used

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  • High-speed low-power consumption large-swing operational amplifier for analog-digital converter of production line
  • High-speed low-power consumption large-swing operational amplifier for analog-digital converter of production line
  • High-speed low-power consumption large-swing operational amplifier for analog-digital converter of production line

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Embodiment Construction

[0013] Further describe the present invention below in conjunction with accompanying drawing.

[0014] In the present invention, the operational amplifier is a sleeve type cascode operational amplifier with gain bootstrapping, a differential input pair composed of input tail current source tube 1, MOS tubes 2, 3, N-type common grid tubes 4, 5, P-type common gate transistors 6, 7, P-type load transistors 8, 9, a replica circuit composed of MOS transistors 10-15, and bootstrap circuits 42, 43. The P-type load tubes 8 and 9 are connected to the common-mode feedback voltage, and the input tail current source tube 1 and the MOS tube 10 in the tube of the replica circuit form a current mirror. Both the input tail current source tube 1 and the P-type load tubes 8 and 9 work in the deep linear region, which further increases the output swing of the op amp, but the output impedance of the input tail current source tube 1 working in the deep linear region is small. It causes the decrea...

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Abstract

The invention belongs to the technical field of integrated circuits, in particular to a high-speed low-power consumption large-swing operational amplifier for an analog-digital converter of a production line. The operational amplifier consists of an input tail current source tube, differential input geminate transistors, an N-type co-gate tube, a P-type co-gate tube, a P-type load tube, a duplicate circuit and a bootstrap circuit. A gain-boosting sleeve type cascade structure is adopted, so the tail current source tube and the PMOS load tube work in a linear area to increase the output swing; and the duplicate circuit dynamically regulates the grid voltage of the tail current source to maintain constant current and increase output impedence so as to improve the common-mode rejection ratio and the power rejection ratio. The operational amplifier realizes high speed, low power consumption, large output swing, high common-mode rejection ratio and high power rejection ratio.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a high-speed, low-power consumption and large-swing operational amplifier used for pipeline analog-to-digital converters. Background technique [0002] The design of high-speed, low-power analog-to-digital converters is the overall development trend in the design of mixed-signal system chips today, and it has a wide range of applications in data communication, liquid crystal display drivers, SOC systems, 10 / 100M Ethernet, etc. . Among the many kinds of analog-to-digital converter circuit structures, the pipeline structure has become the first choice because of its trade-off advantages in speed, accuracy and power consumption. [0003] Each stage of the pipeline A / D converter needs to sample and hold the analog results output by the previous stage, which requires an operational amplifier with switched capacitors. Its speed, power consumption, swing, noise,...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03M1/12
Inventor 任俊彦范明俊舒光华束晨许俊李宁叶凡
Owner FUDAN UNIV
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