Semiconductor strain gauge bridge circuit
First Claim
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1. A semiconductor strain gauge bridge circuit device comprising:
- a bridge circuit composed of semiconductor strain gauges and having a pair of power supply terminals to be connected to a power source and also having another pair of output terminals;
a first zero-point temperature compensation circuit connected across said power supply terminals and having a junction point connected through a resistor to one of said output terminals, said junction point being at a potential, when said power supply terminals are connected to a power source, which is substantially equal to a potential appearing at said one output terminal at a predetermined temperature; and
a nonlinearity compensation circuit connected across the other of said output terminals and one of said power supply terminals and having a non-linear temperature-resistance characteristic substantially the same as that of the semiconductor strain gauge bridge circuit so that a zero-point output versus temperature characteristic of the semiconductor strain gauge bridge circuit is substantially flattened over a predetermined temperature range that includes said predetermined temperature.
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Abstract
A semiconductor strain gauge bridge circuit device is disclosed to include a bridge circuit of semiconductor strain gauges, a first zero-point temperature compensation circuit connected to one of a pair of output terminals of the bridge circuit and including a voltage-dividing resistor circuit generating a voltage substantially equal to a potential appearing at the one output terminal at a predetermined temperature, and a second zero-point temperature compensation circuit connected to the other of the output terminals and including a resistive element having a temperature characteristic similar to that of the semiconductor strain gauges.
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Citations
6 Claims
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1. A semiconductor strain gauge bridge circuit device comprising:
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a bridge circuit composed of semiconductor strain gauges and having a pair of power supply terminals to be connected to a power source and also having another pair of output terminals; a first zero-point temperature compensation circuit connected across said power supply terminals and having a junction point connected through a resistor to one of said output terminals, said junction point being at a potential, when said power supply terminals are connected to a power source, which is substantially equal to a potential appearing at said one output terminal at a predetermined temperature; and a nonlinearity compensation circuit connected across the other of said output terminals and one of said power supply terminals and having a non-linear temperature-resistance characteristic substantially the same as that of the semiconductor strain gauge bridge circuit so that a zero-point output versus temperature characteristic of the semiconductor strain gauge bridge circuit is substantially flattened over a predetermined temperature range that includes said predetermined temperature. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification