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Common-mode voltage controllable current-to-voltage conversion device and method

A technology of current-to-voltage and common-mode voltage, which is applied in the field of current-to-voltage, and can solve the problems such as the limitation of application occasions of current-to-voltage devices

Inactive Publication Date: 2020-04-17
中科威发半导体(苏州)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the common-mode voltage of ordinary resistance structure is determined by the resistance value itself. Since the differential-mode voltage is also determined by the resistance value, this makes the application of current-to-voltage devices with ordinary resistance structure very limited.

Method used

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  • Common-mode voltage controllable current-to-voltage conversion device and method
  • Common-mode voltage controllable current-to-voltage conversion device and method

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Embodiment Construction

[0038] In various embodiments of the present invention, the current-to-voltage device with controllable common-mode voltage includes: a common-mode acquisition circuit, a differential-mode resistor, a MOS tube, an operational amplifier, and an adjustable voltage source; wherein, the differential-mode resistor , used to extract current from the first current terminal (Ip) and the second current terminal (In) of the two current terminals, and inject the extracted current into the MOS tube to generate current at the first current terminal Ip and the second current terminal In Generate a differential mode voltage; the common mode acquisition circuit, MOS tube, operational amplifier and the differential mode resistor are connected to form a negative feedback loop, so that the common mode value of the output voltage is the same as the voltage value of the adjustable voltage source .

[0039] The present invention will be described in further detail below in conjunction with the exam...

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Abstract

The invention discloses a current-to-voltage conversion device with controllable common-mode voltage. The device comprises a common-mode collection circuit, a differential-mode resistor, an MOS transistor, an operational amplifier and an adjustable voltage source, wherein the differential mode resistor is used for extracting current from a first current end Ip and a second current end In of the two current ends and injecting the extracted current into the MOS tube so as to generate differential mode voltage at the first current end Ip and the second current end In; and the common-mode collection circuit, the MOS transistor, the operational amplifier and the differential-mode resistor are connected to form a negative feedback loop, so that the common-mode value of the output voltage is thesame as the voltage value of the adjustable voltage source. The invention further discloses a common-mode voltage controllable current-to-voltage conversion method.

Description

technical field [0001] The invention relates to current-to-voltage technology, in particular to a current-to-voltage device and method with controllable common-mode voltage. Background technique [0002] In applications that convert current to voltage, the output voltage must accommodate the common-mode value requirements of the input voltages of other devices. However, the common-mode voltage of the ordinary resistance structure is determined by the resistance value itself, and since the differential-mode voltage is also determined by the resistance value, this makes the application of the current-to-voltage device with the ordinary resistance structure very limited. It is necessary to provide a current-to-voltage device with controllable common-mode voltage to strictly separate the common-mode voltage and differential-mode voltage. Contents of the invention [0003] In view of this, the main purpose of the present invention is to provide a current-to-voltage device and ...

Claims

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Application Information

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IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 冯霞
Owner 中科威发半导体(苏州)有限公司
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