Differential reference voltage buffer

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...

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

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