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nested ammeter

An ammeter, nested technology for use in amplifiers, instruments, measuring devices, etc. with semiconductor devices/discharge tubes

Active Publication Date: 2021-07-20
KEITHLEY INSTRUMENTS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the impedance of the feedback element 202 to drop at the same frequency at which the op amp 210 begins to roll-off

Method used

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Embodiment Construction

[0020] Embodiments of the disclosed technology relate generally to electrical measuring equipment, and more particularly, to nested ammeters suitable for use in measuring electrical current.

[0021] image 3 One example of a feedback ammeter design 300 is illustrated in which an active shunt 302 is used as the resistive feedback element in accordance with certain embodiments of the disclosed technology. This configuration generally results in more stable performance for the same value of sensing capacitor.

[0022] Figure 4 A first example of a nested ammeter configuration 400 is illustrated in accordance with certain embodiments of the disclosed technology. In this example, active shunt 404 may use another active shunt 402 as its feedback resistor. This results in an ammeter (ie current to voltage converter) with reduced input resistance. That is, the current sense resistor is reduced by the gain of the two active shunt loops 402 , 404 . For example, if each active shu...

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Abstract

This invention relates to nested ammeters. A nested ammeter for measuring current flowing through a device under test (DUT) may include an input configured to receive an input signal having a frequency within a frequency band and representing current flowing through the DUT. The nested ammeter may also include an output configured to generate an output voltage representative of the current flowing through the DUT. Active shunts can be used as resistive feedback for ammeters. Nested active shunts can be used as resistive feedback elements for active shunts.

Description

technical field [0001] The disclosed technology relates generally to electrical measuring equipment, and in particular to ammeters for use in measuring electrical current. Background technique [0002] Ammeters are often subcomponents of electrical measurement products including digital multimeters (DMMs) and source measure units (SMUs). There are several ways in which current through a device under test (DUT) can be measured. SMUs are commonly used to make precise measurements in many fields, including the testing of semiconductor products. A typical SMU design includes a voltage or current source with integrated voltage and current measurement capabilities. A device under test (DUT) is typically coupled to an SMU and then stimulated with a voltage or current source. [0003] There are several ways in which the current through the DUT can be measured. For example, a shunt ammeter can be used to simply sense across a resistor R S voltage across. R S Must be kept small...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
CPCG01R1/203G01R19/0023H03F3/45475H03F2200/261H03F2203/45138G01R15/146G01R19/0092
Inventor W.C.格克
Owner KEITHLEY INSTRUMENTS INC
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