Infineon Technologies Ag

Jaro Robert Stimma

Karl Schr&ouml;dinger

The invention relates to a temperature sensor having a first FET transistor circuit and a second FET transistor circuit and also to a method for operating a temperature sensor. Both FET transistor circuits are operated at an operating point that lies outside the temperature-independent operating point. The difference between the voltages at the first and second FET transistor circuits is evaluated as a measure of the temperature at one of the FET transistor circuits. The invention enables the temperature sensor to provide a relatively large output signal even in the case of only small changes in temperature.

Temperature sensor and method for operating a temperature sensor

An electronic output module, especially an electronic output module for CMOS-LVDS levels (LVDS-low voltage differential signalling), is suitable for analogue and digital high-frequency circuits. The output module has a first and a second transistor which are connected to a current source at a first connection and to input terminals by a control connection. A third and a fourth transistor are connected to a supply voltage potential by a first connection, to a second connection of the first and second transistors, and to an output terminal by a second connection and to converted input signals by a control connection.

Electronic output stage

A temperature sensor has a first FET transistor circuit, whose operating point is located at the temperature-independent point, and a second FET transistor circuit whose operating point is above this point. The voltage difference in this case depends essentially linearly on the temperature. In addition, a circuit for controlling the gain of an amplifier circuit is provided, in which the current through the amplifier circuit at low temperatures is reduced by an appropriate control of the gate voltage of a transistor serving as a current source, so that an amplification which is substantially independent of temperature is carried out.

Temperature sensor and circuit configuration for controlling the gain of an amplifier circuit

A differential amplifier has two amplifier paths. The second amplifier path is operated in the opposite direction relative to the first amplifier path. The outputs of the two amplifier paths form a differential output and are in each case connected to one another via a respective load resistor at a node. The operating point of the two amplifier paths is set by the voltage that is present at the node. The differential load is divided into two individual resistors and the voltage present between the individual resistors serves for setting the operating point of the amplifier paths. The bandwidth and the gain can be influenced by varying the resistances of the load resistors.

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Berlin, Germany

Jaro Robert Stimma