Power supply circuit capable of automatically reducing LDO power consumption and signal generator

Abstract

The invention discloses a power supply circuit capable of automatically reducing LDO power consumption and a signal generator, and the circuit comprises: a control unit which is used for respectivelyproviding the generated same analog voltage for a first voltage control network and a second voltage control network; a first voltage control network which is used for cooperating with the DCDC to execute linear scaling processing with a first scaling coefficient on the analog voltage to generate a first output voltage; and a second voltage control network which is used for cooperating with the LDO to execute linear scaling processing with a second scaling coefficient on the analog voltage to generate a second output voltage, wherein the first scaling coefficient and the second scaling coefficient are configured to be equal so as to achieve gain elimination of the first output voltage and the second output voltage on the analog voltage, and the difference value between the first output voltage and the second output voltage is not larger than a preset voltage difference threshold value, the control signals output by the DCDC and the LDO are associated to the same controller, gain elimination of the output of the DCDC and the LDO to the control signals is achieved through configuration, it is ensured that a fixed low-voltage difference value exists between the input voltage and the output voltage of the LDO, and therefore the power consumption of the LDO is effectively reduced.

Description

technical field [0001] The invention belongs to the field of power supply technology, and more specifically relates to a power supply circuit and a signal generator for automatically reducing power consumption of an LDO. Background technique [0002] In electronic systems, the ripple and power consumption of the power supply are the key points that need to be paid attention to in the design. Precision equipment, such as power supplies used in signal generators, need to have the characteristics of low noise and small ripple. Low dropout regulators (low dropout regulators, LDOs) are undoubtedly one of the most suitable power supplies at present. In the traditional power supply structure, the input voltage of the LDO remains unchanged. For the drive circuit that needs to output an adjustable voltage range, when a lower output voltage is required, the LDO will bear a large voltage difference, causing the circuit power consumption and heat to increase sharply. rise, thereby affe...

AI Technical Summary

Problems solved by technology

During the software adjustment process, the LDO circuit is in a large voltage drop state, resulting in a very large power consumption of the LDO

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