Arrangement and method for temperature compensation for resistance
First Claim
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1. A temperature compensation arrangement for a resistance comprising:
- a resistance having a controllable resistance value;
a reference resistance which forms a switched capacitor;
a comparator having an input side which is coupled to the resistance having the controllable resistance value and to the reference resistance and having an output for outputting an error signal;
a control input on the resistance having the controllable resistance value which is coupled to the output of the comparator for controlling the resistance value; and
a common current source which is switchably connected to two current paths;
wherein a first current path of the two current paths comprises the resistance having the controllable resistance and a second current path of the two current paths comprises the reference resistance which forms the switched capacitor.
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Abstract
An arrangement and a method for temperature compensation for a resistance (1). A resistance (1) with a controllable resistance value is compared with a reference resistance (2) which is in the form of a switched capacitor. A comparator (3) compares the two resistance values with one another. The comparator (3) takes an error signal as a basis for actuating the controllable resistance (1). This produces a thermally stable resistance. The principle can preferably be applied in transimpedance amplifiers.
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Citations
16 Claims
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1. A temperature compensation arrangement for a resistance comprising:
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a resistance having a controllable resistance value; a reference resistance which forms a switched capacitor; a comparator having an input side which is coupled to the resistance having the controllable resistance value and to the reference resistance and having an output for outputting an error signal; a control input on the resistance having the controllable resistance value which is coupled to the output of the comparator for controlling the resistance value; and a common current source which is switchably connected to two current paths; wherein a first current path of the two current paths comprises the resistance having the controllable resistance and a second current path of the two current paths comprises the reference resistance which forms the switched capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for temperature compensation for a resistance, comprising the steps of
providing a controllable resistance; -
providing and actuating a reference resistance as a switched capacitor; comparing a resistance value of the controllable resistance with the resistance value of the reference resistance; controlling resistance value of the controllable resistance based on a comparison result from the, comparison of the resistance value of the controllable resistance with the resistance value of the reference resistance; and alternately supplying a first current path and a second current path with a common current, the first current path comprising the controllable resistance and the second current path comprising the reference resistance. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification