Resistance-free reference voltage source

Abstract

The invention belongs to the technical field of power supplies, and particularly relates to a resistance-free reference voltage source. The resistance-free reference voltage source comprises a positive temperature coefficient current source module, a reference voltage generating module and a substrate bias voltage regulation module; the positive temperature coefficient current source module and the substrate bias voltage regulation module are connected with the reference voltage generating module; the positive temperature coefficient current source module generates a positive temperature coefficient current to supply a bias current to an NMOS tube MN4 working in a saturation region; the substrate bias voltage regulation module regulates a substrate bias voltage for the NMOS tube MN4, and the effect of regulating the threshold value is achieved; a grid electrode and a drain electrode of NMOS are connected together to output the referent voltage, and influences of technical fluctuation on reference source output are overcome. The resistance-free reference voltage source has the advantages that the territory area is decreased by adopting a resistance-free technology, a low-reference voltage source is output simultaneously, and the precision of the reference voltage source can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to a non-resistance reference voltage source. Background technique [0002] The reference voltage source is used to provide a stable reference voltage for other modules of the circuit in analog integrated circuits, digital-analog mixed-signal integrated circuits, and system integrated chips. The accuracy of the reference voltage source is required to be less affected by changes in temperature and power supply voltage. The accuracy of the voltage source usually directly determines the accuracy of the overall system. [0003] With the development of electronic technology, electronic products are developing in the direction of smaller size, lower cost and longer battery life. Therefore, the power supply voltage of the system is required to be lower and lower, and the power consumption is smaller and smaller. The output voltage of the traditional bandgap reference vo...

AI Technical Summary

Problems solved by technology

The output voltage of the traditional bandgap reference voltage source architecture can only be around 1.2V, and it is necessary to use resistors or BJT transistors to generate PTAT current in the design process, which limits the process of integrated circuits, so there are problems of complex structure and high cost

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