Fully-differential amplifier and residual gain circuit using fully-differential amplifier

A fully differential amplifier and gain circuit technology, applied in the direction of differential amplifiers, amplifiers, amplification control, etc., can solve the problems of low power consumption, gain reduction, gain high speed, etc., achieve fast charge and discharge characteristics, and improve DC gain , the effect of increasing the equivalent gain
CN106953606AActive Publication Date: 2017-07-14INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
Publication Date
2017-07-14

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Abstract

The invention relates to a fully-differential amplifier. The fully-differential amplifier comprises first and second complementary differential input pairs, and further comprises a positive feedback system; the positive feedback system is connected with the first and second complementary differential input pairs, and used for providing positive feedback to the first complementary differential input pair and the second complementary differential input pair; the positive feedback system comprises a third complementary differential input pair; the third complementary differential input pair comprises a first PMOS transistor and a second PMOS transistor; the grids of the first PMOS transistor and the second PMOS transistor are separately connected with the output ends of the first complementary differential input pair and the second complementary differential input pair; and the drains of the first PMOS transistor and the second PMOS transistor are separately connected with the output ends of the second complementary differential input pair and the first complementary differential input pair. On the basis of the fully-differential amplifier, the invention further provides a residual gain circuit adopting a related level shift method. The fully-differential amplifier disclosed by the invention has the advantages of being low in power consumption, rapid in speed, high in conversion rate and simple in circuit structure; and, with the help of the related level shift technology, the high-speed and high-precision residual gain circuit can be realized.
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Description

technical field

[0001] The invention belongs to the field of analog-to-digital converters, and more specifically relates to a fully differential amplifier and a residual gain circuit using the same. Background technique

[0002] Pipeline analog-to-digital converter (ADC) is a kind of high-speed and high-precision analog-to-digital converter, which is widely used in communication systems and complementary metal oxide semiconductor (CMOS) image sensors. In the traditional pipeline ADC design, the transconductance operational amplifier (OTA) accounts for the main part of the power consumption in the analog domain. Therefore, designing a high-performance OTA is crucial to the entire ADC.

[0003] Existing OTAs are generally divided into telescopic OTAs, foldable OTAs, and two-stage OTAs. As shown in Figure 1(a), it is a telescopic cascode OTA, which has a large gain, the fastest speed, and the lowest power consumption, but its input and output swings are the smallest. When conn...

Claims

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