Multi-channel Power Supply Calibration System and Its Working Method
A calibration system and multi-channel power supply technology, which is applied in the electronic field, can solve the problem of multiple workloads for trimming and adjusting components, and achieve the effects of saving control bits, suppressing voltage errors, and improving initial accuracy
Active Publication Date: 2018-03-30
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology
The traditional trimming technology generally uses melt blowing, laser and other technologies to independently calibrate each linear regulator, which requires more trimming components and a lot of work.
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[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.
[0039] It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.
[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the present invention.
[0041] refer to figure 1 , the present invention provides a multi-channel power ...
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The invention relates to the field of electronic technology, in particular to a multi-channel power supply calibration system and a working method thereof. It includes: a primary calibration unit, which receives a reference voltage provided by a reference source and calibrates it to output a calibrated first reference voltage; a plurality of linear voltage regulators are used to provide multiple output voltages, each linear voltage regulator The regulator includes a secondary calibration unit, the secondary calibration unit is connected to the voltage feedback network of the corresponding linear voltage regulator, and is used to trim the sampling voltage of the output voltage of the linear voltage regulator, so that the linear voltage regulator is in the first A reference voltage and a corresponding sampling voltage are applied to calibrate the output voltage. The present invention sets the primary calibration unit to improve the initial accuracy of the first reference voltage, and then the secondary calibration units of each linear voltage regulator independently calibrate their own output voltages, which can save multiple control bits, and the system contains multiple When using a linear regulator, the savings in control bits is considerable.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a multi-channel power supply calibration system. Background technique [0002] In the field of power management of portable devices, the operating voltages required by different functional modules are often different, and multiple power converters are required to cope with different power supply requirements. LDO (low dropout linear regulator) can ensure the output through feedback regulation. Voltage stability and high precision are suitable for integration in on-chip power management systems, and are widely used because of their comprehensive advantages such as low dropout and low noise. Due to process deviation and reference source error, the output voltage of LDO often deviates from The preset value, in order to still output a stable voltage when the input voltage or the reference voltage fluctuates within a certain range, generally adjust the circuit to adjust the output...
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IPC IPC(8): G05F1/46
Inventor 杨攀
Owner SPREADTRUM COMM (SHANGHAI) CO LTD