Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-12-10
1989-10-10
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328135, 328142, 307310, 307490, 307491, 307494, 307529, G01K 700, G06G 712, G06G 700, H01L 3100
Patent
active
048734900
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention relates to a circuit arrangement for generating a signal that is non-linearly dependent on temperature and having a temperature-dependent resistor bridge circuit connected between two power-supply lines.
A circuit arrangement of this type is already known from the publication entitled "Guidebook of Electronic Circuits", McGraw-Hill, U.S.A., 1974. The circuit arrangement is designed as a bridge amplifier in which a resistor bridge circuit having two temperature-dependent resistors is connected in such a way that the temperature-dependent resistors are diagonally opposite one another. The temperature-dependent bridge voltage present in the bridge diagonal is amplified by an operational amplifier, the output of which is fed back via a resistor to the inverting input of the operational amplifier and thus fed back into the resistor bridge circuit. When there are major temperature deviations from the normal state, the circuit arrangement exhibits a notable non-linearity, which is negligible, however, with minor temperature deviations.
From German Utility Model 81 19 025, a sensor is known for detecting the pressure of a medium, using at least one element that varies its resistance under the influence of pressure. This element is preferably embodied by a resistor bridge circuit, the individual resistors of which are formed by thick-film techniques using a resistor paste. The element is disposed on a substrate that is elastically deformable in response to pressure, so that when pressure is exerted, a voltage signal is produced in the bridge diagonal. For temperature compensation, resistor pastes having different temperature coefficients can be used.
In designing circuit arrangements for evaluating sensor signals, it often becomes necessary to provide suitable measures for temperature compensation. Typically, the temperature response of the output signal of the circuit arrangement is first calculated or plotted. The temperature response can be represented mathematically as a function dependent on the temperature, which in turn can be developed into a power series. For most technical applications, it is sufficient for the linear member of the temperature response to be compensated for, since the higherorder members are sufficiently small with respect to an allowable tolerance. For high-precision applications, however, provisions must be made to compensate for quadratic and sometimes even higher components of the temperature response. The actual compensation is then generally such that a separate temperature-dependent signal is formed within the circuit arrangement, and this signal is suitably added to or subtracted from the output signal.
Accordingly, it is the object of the present invention to provide a circuit arrangement for generating an output signal that is nonlinearly and in particular quadratically dependent on the temperature, the circuit arrangement being particularly simple in structure and therefore capable of being incorporated into virtually any other circuit arrangement in a space-saving manner without requiring special provisions to that end.
This object is attained by the circuit arrangement having a bridge circuit assembled of two pairs of temperature-dependent resistors of opposite temperature coefficients interconnected at diagonally opposite junction points, each of the junction points corresponding to a connection point of a resistors having a negative temperature coefficient, one pair of the opposite junction points being connected to a power supply; and a series circuit of two resistors of opposite temperature coefficients being connected between the other pair of opposite junction points whereby the output signal is formed at the connection point of the two resistors in the series circuit.
ADVANTAGES OF THE INVENTION
The circuit arrangement according to the invention has the particular advantage over the circuit arrangement known from the prior art that it comprises solely resistor elements and therefore can be applied particularly simply to a substrate us
REFERENCES:
Oswald, "Thermistor Temperature to Current Transducer", IBM Technical Disclosure Bulletin, vol. 7, No. 12, May 1965.
Hecht Hans
Kuhnt Winfried
Miller Stanley D.
Phan Trong Quang
Robert & Bosch GmbH
Striker Michael J.
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