Complementary input circularly folding gain bootstrap operational transconductance amplifier

An operational amplifier and transconductance technology, used in DC-coupled DC amplifiers, differential amplifiers and other directions, which can solve the problems of slow OTA speed and high power consumption.

Active Publication Date: 2010-06-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing folded gain bootstrap OTA, such as slow speed a

Method used

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  • Complementary input circularly folding gain bootstrap operational transconductance amplifier
  • Complementary input circularly folding gain bootstrap operational transconductance amplifier
  • Complementary input circularly folding gain bootstrap operational transconductance amplifier

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Embodiment Construction

[0026] Technical solution of the present invention refers to figure 1 . figure 1 It is a loop folding gain bootstrap OTA with a complementary input, which is different from the conventional gain bootstrap OTA. It uses an N-type MOS transistor and a P-type MOS transistor branch complementary input, and both branches use the Rida S.Assaad and Jose Silva-Martinez in the article "The Recycling Folded Cascode: A General Enhancement of the Folded Cascode Amplifier" IEEE Journal of Solid State Circuits, September 2009, Vol.

[0027] figure 1 The middle transistors M1a, M1b, M2a, and M2b are P-type input devices, and M14a, M14b, M15a, and M15b are N-type input devices. VINP and VINN are fully differential input signals. VINP is added to the gates of M2a, M2b, M15a, and M15b, and VINN is added to the gates of M1a, M1b, M14a, and M14b. Transistor M0 provides bias current for P-type input branches M1a, M1b, M2a, M2b, and M13 provides bias current for N-type input branches M14a, M14b, ...

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Abstract

The invention relates to a complementary input circularly folding gain bootstrap operational transconductance amplifier, belongs to the technical field of operational amplifiers, and is characterized by comprising a complementary input circularly folding differential input circuit and a cascode bootstrap circuit, wherein the cascode bootstrap circuit comprises auxiliary operational amplifiers Nboost and Pboost; and the auxiliary operational amplifier Pboost is a folding operational transconductance amplifier consisting of N-type input transistors. Due to the adoption of a structure combining complementary input circularly folding transconductance with the cascode bootstrap circuit, a gain bootstrap operational amplifier with high unity gain bandwidth is obtained so as to greatly improve the working speed of the bootstrap operational amplifier.

Description

technical field [0001] The invention belongs to the design of ultra-large-scale integrated circuits in the fields of microelectronics and solid-state electronics, and relates to a novel gain bootstrap amplifier circuit, which can be used in the design of analog signal processing circuits such as analog-to-digital conversion circuits and filters. Background technique [0002] This invention relates to the design of high speed gain bootstrap operational amplifiers in high performance switched capacitor circuits such as high speed analog to digital converters. The operational amplifier is one of the most important modules of many analog circuits, and is widely used in analog signal processing circuits such as analog-to-digital conversion circuits and filters. It usually determines the accuracy, speed and power consumption that the high-performance switched capacitor circuit can achieve. In a switched capacitor circuit, the load is usually purely capacitive. At this time, the p...

Claims

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Application Information

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IPC IPC(8): H03F3/45
Inventor 魏琦乔飞杨华中汪蕙
Owner TSINGHUA UNIV
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