CIRCUIT ARRANGEMENT WITH TEMPERATURE COMPENSATION
First Claim
1. A circuit arrangement having at least one analog switch, which is operated with a supply voltage and comprises a switching signal contact and a pair of switch contacts, whereby applied to the switching signal contact is an electrical switching signal depending on which an electrical connection can be switched between the switch contacts whose internal on-resistance is temperature dependent, wherein the circuit arrangement has in the vicinity of the at least one analog switch at least one additional similar reference analog switch, which is operated with the same common supply voltage and which is controlled such that the switch contacts thereof are connectable continuously via the internal temperature-dependent on-resistance thereof, whereby at least one comparison circuit is provided by means of which depending on the comparison of the internal on-resistance of the at least one reference analog switch with at least one external reference resistance or another setpoint setting of the reference analog switch(es), at least one control signal is generated, by means of which the internal on-resistance of the at least one reference analog switch is kept constant by changing the common supply voltage of all analog switches depending on the control signal, particularly can be adjusted to the at least one reference resistance or the otherwise formed setpoint setting of the reference analog switch(es).
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Accused Products
Abstract
A circuit arrangement having at least one analog switch, which is operated by a supply voltage and which comprises a switching signal contact and a pair of switch contacts, whereby applied to the switching signal contact is an electrical switching signal depending on which an electrical connection can be switched between the switch contacts whose internal on-resistance is temperature dependent, whereby the circuit arrangement has in the vicinity of the at least one analog switch at least one additional similar reference analog switch, which is operated with the same common supply voltage and which is controlled such that the switch contacts thereof are/can be connected continuously via the internal temperature-dependent on-resistance thereof, whereby at least one comparison circuit is provided by means of which depending on the comparison of the internal on-resistance of the at least one reference analog switch with at least one external reference resistance or an otherwise setpoint setting of the reference analog switch(es), at least one control signal can be/is generated, by means of which the internal on-resistance of the at least one reference analog switch can be kept constant by changing the common supply voltage of all analog switches depending on the control signal, particularly can be adjusted to the at least one reference resistance, or the otherwise formed setpoint setting of the reference analog switch(es).
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Citations
20 Claims
- 1. A circuit arrangement having at least one analog switch, which is operated with a supply voltage and comprises a switching signal contact and a pair of switch contacts, whereby applied to the switching signal contact is an electrical switching signal depending on which an electrical connection can be switched between the switch contacts whose internal on-resistance is temperature dependent, wherein the circuit arrangement has in the vicinity of the at least one analog switch at least one additional similar reference analog switch, which is operated with the same common supply voltage and which is controlled such that the switch contacts thereof are connectable continuously via the internal temperature-dependent on-resistance thereof, whereby at least one comparison circuit is provided by means of which depending on the comparison of the internal on-resistance of the at least one reference analog switch with at least one external reference resistance or another setpoint setting of the reference analog switch(es), at least one control signal is generated, by means of which the internal on-resistance of the at least one reference analog switch is kept constant by changing the common supply voltage of all analog switches depending on the control signal, particularly can be adjusted to the at least one reference resistance or the otherwise formed setpoint setting of the reference analog switch(es).
- 10. A method for compensating the temperature dependence of the on-resistance of at least one analog switch, operated with a supply voltage, wherein the internal temperature-dependent on-resistance is continuously compared by at least one additional similar reference analog switch, arranged in a vicinity of the at least one analog switch, with at least one external temperature-independent reference resistance or with an otherwise predefined setpoint value for the resistance of the reference analog switch, and with a control signal dependent on the comparison result, particularly by control of a voltage regulator with the control signal, the common supply voltage of the at least one analog switch and of the at least one reference analog switch is adjusted so that the internal temperature-dependent on-resistance of the at least one reference analog switch corresponds to a predefined setpoint value, particularly the at least one reference resistance.
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12. A circuit arrangement comprising:
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a testing component comprising at least one analog switch having an internal resistance that is temperature dependent; and a comparison circuit comprising a reference analog switch having an internal resistance that is temperature dependent and comprising a reference resistance, the comparison circuit being arranged in a vicinity of the testing component such that the reference analog switch obtains substantially a same temperature as the analog switch during operation thereof, wherein the analog switch and the reference analog switch is supplied with the same supply voltage, wherein the internal resistance of the reference analog switch is compared to an internal resistance of the reference resistance, and wherein the internal resistance of the analog switch and the internal resistance of the reference analog switch are adjusted via a change to the supply voltage such that the internal resistances of the analog switch and the reference analog switch become substantially the same as the internal resistance of the reference resistance. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification