Current measurement circuit
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United States of America Patent
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Jan 16, 2018
Issued Date -
N/A
app pub date -
Oct 28, 2015
filing date -
Nov 28, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A current measurement circuit converts a current signal IIN into a voltage signal VOUT. The current signal IIN is transmitted via a signal line. A shield line is arranged in the vicinity of at least a part of the signal line. A non-inverting amplifier includes an operational amplifier, and the current signal IIN is input to its non-inverting input terminal. The output signal of the non-inverting amplifier is input to its inverting input terminal as a feedback signal. An inverting amplifier amplifies the output signal of the non-inverting amplifier with inversion so as to generate a voltage signal VOUT. An impedance circuit includes a feedback resistor RF between the output terminal of the inverting amplifier and the non-inverting input terminal of the operational amplifier. A guard amplifier receives the electric potential at the inverting input terminal of the operational amplifier, and applies the electric potential to the shield line.
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International Classification(s)
- C12Q:MEASURING OR TESTING PROCESSES INVOLVING ENZYMES O....
- B82Y:SPECIFIC USES OR APPLICATIONS OF NANO-STRUCTURES; ....
- G01N:INVESTIGATING OR ANALYSING MATERIALS BY DETERMININ....
- H03F:AMPLIFIERS
- G01R:MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC V....
- G05F:SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIAB....
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