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Reference voltage drive circuit

A technology of reference voltage and drive circuit, applied in the direction of adjusting electrical variables, instruments, control/regulating systems, etc., can solve the problems of limited voltage swing, weak ability to follow current absorption, and difficult to apply.

Active Publication Date: 2020-03-24
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] First: the output voltage swing is limited
like figure 1 As shown, the circuit 141 is a partial amplification of the differential operational amplifier 14. Due to the existence of the NMOS transistor M61, the output of the operational amplifier 14 needs to consume an overdrive voltage Vov61, so that VopVov43, so the total output swing Vrp-Vrn=VDD-Vov61-Vth-Vov41-Vov43, especially for advanced technology, the supply voltage is getting lower and lower, it is difficult to apply
[0007] Second: because the traditional open-loop source follower circuit 12 all uses NMOS transistors M41-M43, the source follower and sink current capability of the low reference level Vrn is weak

Method used

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Embodiment Construction

[0035] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0036] Many specific details are set forth in the following description to facilitate a full understanding of the present invention, and the described embodiments are only some of the embodiments of the present invention, rather than all of them. 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.

[0037] It should be noted that when a component is considered to be "connected" to another component, it may be directly con...

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Abstract

The application provides a reference voltage drive circuit which is characterized in that the reference voltage drive circuit comprises a negative feedback circuit and a drive branch; the negative feedback circuit comprises first and a second difference operation amplifiers, first and second level shift circuits and a replication branch; the replication branch is arranged such that the ratio of the current flowing through the replication branch to the current flowing through the drive branch is 1:K; the drive branch receives the first and second bias voltages provided by the feedback circuit and outputs the first and second driving voltages. The reference voltage drive circuit can realize a wide output voltage range through the first and second level shift circuits; the drive branch uses an NMOS transistor and a PMOS to form an output of the push-pull stage, thereby increasing the settling speed of the driving voltage.

Description

technical field [0001] The invention relates to the technical field of circuit development, in particular to a reference voltage driving circuit with high speed and wide output swing. Background technique [0002] This section is intended to provide a background or context for implementations of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] Communication base stations and radar systems often require a high-speed and high-precision ADC (Analog-to-Digital Converter, Analog-to-Digital Converter) to improve performance. For high-speed and high-precision ADCs, the accuracy and stability of the reference voltage directly affect the performance of the ADC. Since the switched-capacitor ADC will draw or inject charge from the reference voltage terminal when the switch is closed, the reference voltage will jitter, and it will take a certain time to recover. The general reference voltage n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 李福乐刘佳贾雯王志华
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN