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US 5,180,929 AGranted
Voltage measuring circuit
AssigneeOki Electric Industry Co., Ltd.
InventorHitoshi Kokubun
Life of this patent
Estimating the term…
Abstract
A voltage measuring circuit for detecting an unknown voltage in a semiconductor integrated circuit or the like. A voltage to be measured is converted into a first current by a current converting transistor, and a difference between the first current and a reference current is converted into a voltage. As a result, the voltage measuring circuit can be arranged without using a floating node, whereby it is possible to prevent variations in a desired voltage value to be measured.
Claims19
A voltage measuring circuit comprising:
- a current converter having an input terminal and a first current terminal for converting a voltage applied to the input terminal thereof into a current at the first current terminal thereof;
- a reference current generating circuit having a second current terminal for generating a reference current on the second current terminal thereof;
- a current/voltage converting circuit having first and second nodes and first and second output terminals, the current/voltage converting circuit converting currents at the first and second nodes thereof into voltages outputted at the first and second output terminals;
- and
- a voltage transmitting circuit having a first path electrically connected between the first node of said current/voltage converting circuit and the first current terminal, and a second path electrically connected between the second node of said current/voltage converting circuit and the second current terminal, the first path and the second path having the same impedance.
2 more elements
A voltage measuring circuit comprising:
- a voltage-current converter having an input terminal and a first current terminal, the voltage-current converter generating a first current at the first current terminal, a current value of the first current being related to a voltage applied to the input terminal;
- a reference current generating circuit having a second current terminal for generating a reference current at the second current terminal;
- and
- a current-voltage converter having a first node connected to the first current terminal, a second node connected to the second current terminal, a first output terminal and a second output terminal, the current-voltage converter outputting signals to the first and second output terminals thereof, the voltage values of the signals being relative to the currents at the first and second nodes, respectively.
1 more element
Dependencies are inferred from the claim text.