A current source generator

Abstract

The invention discloses a current source generator, comprising: a bandgap source core module for generating a stable reference voltage; an isolation module 1, which is connected to the bandgap source core module and is used to perform noise on the stable reference voltage isolation; a filter module, connected with the isolation module 1, for filtering the stable reference voltage after noise isolation; a reference current generator, connected with the filter module, for generating a reference current; isolation module 2, It is connected with the bandgap source core module, and is used for noise isolation of the stable reference voltage; the PTAT current generator is connected with the second isolation module, and is used for generating a current with a positive temperature coefficient. The invention overcomes the defect of high power supply voltage through the bandgap source core module containing preLDO, and achieves the purpose of low power supply and low power consumption; the isolation module and filter module are used to achieve the purpose of simultaneously having low power consumption, low noise and high PSRR .

Description

technical field [0001] The invention relates to the technical field of microelectronics, in particular to a current source generator with a reference source. Background technique [0002] In the field of electronic equipment, especially in the design of mobile radio frequency communication integrated circuits, it is necessary to generate low power consumption, high PSRR (PowerSupplyRejectionRatio, power supply rejection ratio), low noise, ultra-low temperature coefficient, and adjustable through the bandgap source. Accurate voltage and current, but also need to produce accurate positive temperature coefficient of current, such as low current as low as 1uA, 5uA. It is more important for a SOC (System on Chip, System on Chip) chip, which requires low cost, and relies on digital adjustment, high PSRR, low output impedance, low power consumption, and small area, suitable for integration. [0003] Such as figure 1 It is a schematic diagram of the structure of the usual bandgap ...

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a current source generator to solve the problem that current source generators in the prior art do not have low power consumption, high PSRR, and low noise at the same time, and to provide a A current source and a current source that increases with temperature (PTAT)

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