Linear power supply circuit

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The linear power supply circuit, employing current feedback operational amplifiers, addresses the limitations of traditional power amplifiers in VCM drivers by enhancing linearity and reducing gain errors, thereby improving the overall performance of the VCM driver.

JP2025040711APending Publication Date: 2025-03-25ROHM CO LTD

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Patent Information

Application Number: JP2023147677
Authority / Receiving Office: JP · JP
Patent Type: Applications
Current Assignee / Owner
Filing Date: 2023-09-12
Publication Date: 2025-03-25

Application Information

Patent Timeline

12 Sep 2023

Application

JP2023147677

25 Mar 2025

Publication

JP2025040711A

IPC: H03F3/30; H03F3/45

CPC: G05F1/56; H03F3/45475; H03F3/3022; H03F2203/30105; H03F2203/30009; H03F2203/30006; H03F3/45179; H03F2203/45046

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Application Domain

Power amplifiers Differential amplifiers

Technology Topics

Hemt circuits Control theory

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AI Technical Summary

Technical Problem

Existing power amplifiers used in VCM drivers face limitations in achieving good linearity in input/output characteristics and reducing gain errors, particularly due to the constraints of voltage feedback operational amplifiers.

Method used

A linear power supply circuit is designed with an input unit, current-voltage converter, voltage-current converter, and an output unit utilizing current feedback operational amplifiers to enhance linearity and reduce gain errors.

Benefits of technology

The proposed linear power supply circuit achieves improved linearity in input/output characteristics and small gain errors, effectively addressing the limitations of traditional voltage feedback operational amplifiers.

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Abstract

To provide a linear power supply circuit having excellent linearity in input-output characteristic and a small gain error.SOLUTION: A linear power supply circuit 100 includes: an input part 1 to which an input signal Vin is inputted, for outputting first current signals I11, I12; a current-voltage conversion part 2 for converting the first current signals I11, I12 to a first voltage signal V1; a voltage-current conversion part 3 for converting the first voltage signal V1 to second current signals I31, I32; and an output part 4 for generating an output voltage signal Vo from the second current signals I31, I32 by a first current mirror part 41, a second current mirror part 42, and a third current mirror part 43, and outputting the output voltage signal Vo to an output terminal OUT, where the input part 1 and the current-voltage conversion part 2 configure a current feedback type operational amplifier 5.SELECTED DRAWING: Figure 1

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