Differential reference voltage buffer

A technology of voltage buffer and differential reference, which is applied in the direction of logic circuit connection/interface layout, reliability improvement and modification, etc., and can solve problems affecting the performance and accuracy of data converters, voltage fluctuations, etc.

Active Publication Date: 2012-04-11
SHANGHAI BEILING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in high-speed and high-precision data converters, due to the extensive use of switched capacitor circuits, there will be large voltage fluctuations on the reference voltage and power lines, which seriously affect the performance and accuracy of the entire data converter

Method used

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Embodiment Construction

[0024] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] figure 1 is a schematic circuit diagram of the differential reference voltage buffer of the present invention, such as figure 1 As shown, it includes three parts: a control part 1 , a main buffer part 2 and a copy buffer part 3 , and the main buffer part 2 is connected in series between the control part 1 and the copy buffer part 3 .

[0026] The control part 1 includes a fully differential operational amplifier 10, a common-mode feedback circuit 11 and four resistors R 1 , R 2 , R 3 and R 4 , and R 1 = R 2 , R 3 = R 4 , the output terminal of the common-mode feedback circuit 11 is connected to the common-mode feedback input terminal of the fully differential operational amplifier 10 to determine its output common-mode level.

[0027] Resistance R 1 and R 2 One end is connected to the ground gnd and the reference voltage Vr,...

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PUM

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Abstract

The invention provides a differential reference voltage buffer, which comprises a control section, a copy buffer section, and a main buffer section connected in series between the control section and the copy buffer section, wherein the control section comprises a full differential operational amplifier and a common-mode feedback circuit, and an output end the common-mode feedback circuit is connected to a common-mode feedback input end of the full differential operational amplifier; the main buffer section comprises a first transistor and a second transistor sharing bias current on a same branch, an output end of the full differential operational amplifier is connected to grid electrodes of the first and second transistors, and source electrodes of the first and second transistors are connected to an input end of the common-mode feedback circuit; and the copy buffer section comprises a fourth transistor and a fifth transistor sharing bias current on a same branch, grid electrodes of the fourth and fifth transistors are respectively connected to the grid electrodes of the first and second transistor, and source electrodes of the fourth and fifth transistors respectively output a reference voltage. The differential reference voltage buffer provided by the invention has fast response speed, low noise and low power consumption, and can increase the performance and precision of a data converter.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a differential reference voltage buffer. Background technique [0002] The reference voltage (Voltage Reference) usually refers to a highly stable voltage used as a voltage reference in a circuit, also known as a reference voltage. In many integrated circuits and circuit units, such as digital-to-analog converters (DACs), analog-to-digital converters (ADCs), linear regulators, and switching regulators, precise and stable voltage references are required. An ideal reference voltage source is not affected by power supply and temperature, and can provide a stable voltage in the circuit. [0003] In the data conversion circuit, the reference voltage is used as the benchmark of data quantization, which has high requirements on its speed and accuracy. However, in high-speed and high-precision data converters, due to the extensive use of switched capacitor circuits, there will be lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175H03K19/003
Inventor 丁学欣张辉李旦刘岩海吕海峰
Owner SHANGHAI BEILING
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